setting float levels on and correcting a rich edelbrock carb

grumpyvette

grumpyvette

Administrator
Staff member
it helps a great deal to know what your working with , each carb has good and bad points
NATURALLY if your having problems getting the engine to idle or accelerate smoothly you need to verify its not a vacuum leak, fuel pressure problem,or ignition timing or valve adjustment problem before you start looking for a carb problem
you might find the next vacuum leak a bit faster with this method, as you can much more precisely direct the combustible gas flow, at any suspect leak location
propanetorch.gif

(DONT LIGHT IT) just SLIGHTLY open the valve so its allowing gas to flow at a low volume,start the engine and let it idle at the lowest speed you can then place the tip of the UNLIT torch at any suspected vacuum leak and listen for the rpms to increase and watch the tachometer, gas flowing into a vacuum leak will increase engine speed.
look for loose or missing vacuum hoses, cracked or broken power brake connections, emissions system hoses that are loose, vacuum connections to the trans or ignition, loose connectors missing or loose bolts cracked hoses missing assessory connections etc.
naturally this only locates leaks to the outside, and its possible for the intake to suck air from the lifter gallery, so that also needs to be checked if everything else seems to be ok.
READ THROUGH THE LINKED INFO
http://edelbrock.com/automotive_new/mc/ ... rate.shtml

http://www.edelbrock.com/automotive_new ... vids.shtml


http://www.edelbrock.com/automotive/mis ... -faq.shtml

SKIPPING THE LINKED INFO ABOVE WILL CAUSE YOU TO WASTE TIME AND EFFORT, SEVERAL TIPS LIKE THIS ONE POSTED BELOW HELP

I can't get my idle below 1,000 RPM with my Edelbrock Carb?
Check for correct choke operation and adjustment. Make sure that the fast idle cam is not causing this. Verify the throttle arm rests on the idle speed screw. It is important to verify throttle linkage, and or throttle blades are not binding and have a free range of operation. Throttle return spring should be correctly located and adjusted. In most cases, the return spring should be positioned on the top of the throttle arm forward. This should have been confirmed when the Wide Open Throttle test was performed during the initial installation of the carburetor. Make sure all of the vacuum ports on the carburetor are being utilized or blocked off.


BTW alcohol in fuel tends to cause aluminum to oxidize over time
http://video.foxbusiness.com/v/2000862202001/
STEP ONE, SET FLOATS CORRECTLY AND VERIFY 5psi of fuel pressure and that the needle valve allows fuel flow[/color]
edlfloat.jpg

edlcarbvac.jpg



READ THESE LINKS ALSO
viewtopic.php?f=55&t=3172&p=8673&hilit=testing+fuel+pump#p8673

viewtopic.php?f=55&t=211

viewtopic.php?f=55&t=3052

viewtopic.php?f=55&t=635

viewtopic.php?f=55&t=109

viewtopic.php?f=62&t=882&p=1390&hilit=+propane#p1390

http://store.edelbrock.com/0324edelbroc ... ngdvd.aspx

http://gottafishcarburetors.com/CFM Formula.html

http://www.popularhotrodding.com/tech/0 ... index.html

http://www.edelbrock.com/automotive_new ... manual.pdf

http://wallaceracing.com/intakecfm.php

viewtopic.php?f=4&t=1337&p=2923#p2923


troublechart1.jpg


the most common problem Ive seen is badly adjusted floats and crud in the carb, pulling the front idle mixture screws and using a can of carb cleaner with a straw to soak the area the needles were temporarily removed from followed by a shot of compressed air tends to clear those passages. GUYS that don,t check their carb linkage, and adjustment screws, to see if those are set correcly,
OR guys that don,t set the floats with a 7/16" drill bit under the floats with the carb top up-side-down as per the links below or guys that fail to clean out there needle seat valves or fail to verify they have consistent 4.5-5 psi of fuel pressure, and occasionally a bent metering rod or a bad metering rod spring, or piston binding in its bore
1403-E11.jpg

EDELBROCK

THESE LINKS WILL PROVIDE A GREAT DEAL OF USEFUL INFO
http://www.edelbrock.com/automotive_new ... vids.shtml

http://www.edelbrock.com/automotive_new ... _faq.shtml

http://www.edelbrock.com/automotive_new ... manual.pdf

http://www.visn2.com/UsingVacumeGauge.html

theres also useful info on this link

http://www.telusplanet.net/public/giles ... rouble.htm
edl-1465.jpg

edl-1429.jpg


(look at PG 8) the floats need to hand down about 15/16 and in the up position be 7/16" from the carbs top plate upside down with the floats up.
(see diagram on page 8)
keep in mind, if your chasing a richer than ideal f/a ratio cause,that if the needle and seat valve leaks it will need to be replaced, and crud in the needle seat valve will cause it to leak, if you didn,t install the metering rods correctly it can and does cause the carb to meter fuel incorrectly, if the fuel pressure exceeds about 5 psi in some conditions the carb will flood, not running a decent fuel filter will result in problems
edl-1436.jpg


Ive seen lots of guys that were clueless about selecting metering rods and JETS, so keep that in mind, they ARE replaceable and you can easily change thr A/F ratio
you really need to read this also

viewtopic.php?f=55&t=211&p=1533&hilit=+regulator#p1533

viewtopic.php?f=55&t=635&p=3150&hilit=regulators#p3150

keep in mind holley carbs use a power valves but the edelbrock and q-jet carbs use tapered metering rods that lift up and increase the cross sectional area in the jets for the fuel flow in the jets as the throttle position changes, both systems have advantages and disadvantages
but the jets/metering rods system is fairly easy to work with once you get used to it and its easy to finely adjust the results with experience,the only advantage to the Holley system I see is the easily adjustable float levels that do not require pulling off the top of the carb, but the easily accessed metering rods are a huge plus on the edelbrock carbs and with some DUAL QUAD carb configurations, there's an advantage in the smaller foot print room on the manifold


lots more info here in the sub links, of this thread

viewtopic.php?f=44&t=773

BTW
A/F RATIO CHARACTERISTICS
5 RICH BURN LIMIT: Combustion is weak/erratic.
6-9 EXTREMELY RICH: Black smoke and low power.
10-11 VERY RICH: Some supercharged engines run in this range at full power as a means of controlling detonation.
12-13 RICH: Best power A/F: Un-supercharged WOT.
14-15 CHEMICALLY IDEAL: At 14.6 the A/F is at the theoretical ideal ratio with no excess fuel or oxygen after combustion. Good A/F for part
throttle cruise and light to moderate acceleration.
16-17 LEAN: Best economy A/F ratio. Borderline for part throttle drivability (worse than borderline if EGR is used).
18-19 VERY LEAN: Usual lean limit (Driveability).
20-25 LEAN BURN LIMIT: Varies with engine
and system.


Model #1403 & #1404
ROD/JET REFERENCE CHART
REF # MAIN JET METERING ROD CHANGE FROM BASE
1....................1423 (.086")............................1460 (.065" x .052") ..............................none - stock calibration
2....................1423 (.086")............................1445 (.065" x .047") ..............................Rod
3....................1423 (.086")............................1444 (.065" x .037") ..............................Rod
4....................1423 (.086")............................1461 (.065" x .057") ..............................Rod
5....................1422 (.083")............................1441 (.062" x .052") ..............................Rod & Jet
6....................1423 (.086")............................1463 (.067" x .055") ..............................Rod
7....................1423 (.086")............................1448 (.068" x .052") ..............................Rod
8....................1423 (.086")............................1447 (.068" x .047") ..............................Rod
9....................1423 (.086")............................1446 (.068" x .042") ..............................Rod
10....................1422 (.083")............................1463 (.067" x .055") ..............................Rod & Jet
11....................1422 (.083")............................1460 (.065" x .052") ..............................Jet
12....................1422 (.083")............................1462 (.067" x .049") ..............................Rod & Jet
13....................1423 (.086")............................1452 (.070" x .052") ..............................Rod
14....................1423 (.086")............................1451 (.070" x .047") ..............................Rod
15....................1423 (.086")............................1450 (.070" x .042") ..............................Rod
16....................1422 (.083")............................1438 (.058" x .052") ..............................Rod & Jet
17....................1422 (.083")............................1437 (.057" x .049") ..............................Rod & Jet
18....................1423 (.086")............................1441 (.062" x .052") ..............................Rod
19....................1423 (.086")............................1443 (.063" x .047") ..............................Rod
20....................1423 (.086")............................1442 (.063" x .037") ..............................Rod
21....................1424 (.089")............................1445 (.065" x .047") ..............................Rod & Jet
22....................1424 (.089")............................1460 (.065" x .052") ..............................Jet
23....................1423 (.086")............................1439 (.060" x .052") ..............................Rod
24....................1423 (.086")............................1440 (.060" x .057") ..............................Rod
25....................1422 (.083")............................1436 (.055" x .055") ..............................Rod & Jet
26....................1424 (.089")............................1441 (.062" x .052") ..............................Rod & Jet
27....................1424 (.089")............................1443 (.063" x .047") ..............................Rod & Jet
Main Jet I.D.—All Edelbrock jets have “120-”prefix. The
last three digits minus 300 = actual jet size.
Examples: 120-386 = .086" jet (Edelbrock p/n 1423).
120-401 = .101" jet (Edelbrock p/n 1429).
Secondary Metering
The factory calibration jet is shown in the center column.
For leaner or richer calibration use the jet # indicated in the
appropriate column.
Step 1 Select the combination of Cruise Mode and
Power Mode fuel-metering stages desired for
your calibration. Normal calibration changes
will be within the shaded diagonal area. That is,
Cruise and Power mode changes should be in
the same direction (either richer or leaner) and
usually by the same amount.
Step 2 Find the number that is nearest your desired
combination. This is your Calibration
Reference Number.
Step 3 Find the Calibration Reference Number you have
just selected in Step 2. Listed will be the Main Jet
and Metering Rod required to achieve the desired
fuel metering for the Primaries.
Stock Calibration
Numbers in black are the steps obtainable
using Calibration Kit #1486 plus the stock jets
and metering rods.
Numbers in white are the steps obtainable using jet
and rod combinations shown on this page.
#1403 / 1404 Calibration Reference Chart / Primary Metering
11
3 Stages Lean (12%) JET #1423 (.086")
2 Stages Lean (8%) JET #1424 (.089")
1 Stage Lean (4%) JET #1425 (.092")
SECONDARY Stock Calibration JET #1426 (.095")
1 Stage Rich (4%) JET #1427 (.098")
2 Stages Rich (8%) JET #1429 (.101")
3 Stages Rich (12%) JET #1430 (.104")
#1405 Calibration Reference Chart / Primary Metering
Step 1 Select the combination of Cruise Mode and
Power Mode fuel-metering stages desired for
your calibration. Normal calibration changes
will be within the shaded diagonal area. That is,
Cruise and Power mode changes should be in
the same direction (either richer or leaner) and
usually by the same amount.
Step 2 Find the number that is nearest your desired
combination. This is your Calibration
Reference Number.
Step 3 Find the Calibration Reference Number you have
just selected in Step 2. Listed will be the Main Jet
and Metering Rod required to achieve the desired
fuel metering for the Primaries.
Main Jet I.D.—All Edelbrock jets have “120-”prefix. The
last three digits minus 300 = actual jet size.
Examples: 120-398 = .098" jet (Edelbrock p/n 1427).
120-400 = .100" jet (Edelbrock p/n 1428).
Secondary Metering
The factory calibration jet is shown in the center column.
For leaner or richer calibration use the jet # indicated in the
appropriate column.
Stock

Model #1405
ROD/JET REFERENCE CHART
REF # MAIN JET METERING ROD CHANGE FROM BASE
1....................1428 (.100") .......................... 1451 (.070" x .047")*..............................none - stock calibration
*Some Have ID #695
2....................1428 (.100")............................1450 (.070" x .042") ..............................Rod
3....................1428 (.100")............................1449 (.070" x .037") ..............................Rod
4....................1430 (.104")............................1458 (.075" x .037") ..............................Rod & Jet
5....................1427 (.098")............................1448 (.068" x .052") ..............................Rod & Jet
6....................1428 (.100")............................1452 (.070" x .052") ..............................Rod
7....................1427 (.098")............................1445 (.065" x .047") ..............................Rod & Jet
8....................1428 (.100")............................1448 (.068" x .052") ..............................Rod
9....................1428 (.100")............................1446 (.068" x .042") ..............................Rod
10....................1430 (.104")............................1459 (.075" x .047") ..............................Rod & Jet
11....................1430 (.104")............................1455 (.073" x .042") ..............................Rod & Jet
12....................1427 (.098")............................1441 (.062" x .052") ..............................Rod & Jet
13....................1429 (.101")............................1448 (.068" x .052") ..............................Rod & Jet
14....................1430 (.104")............................1457 (.073" x .052") ..............................Rod & Jet
15....................1430 (.104")............................1456 (.073" x .047") ..............................Rod & Jet
16....................1428 (.100")............................1445 (.065" x .047") ..............................Rod
17....................1430 (.104")............................1452 (.070" x .052") ..............................Rod & Jet
18....................1430 (.104") .......................... 1451 (.070" x .047")*..............................Jet
*Some Have ID #695
19....................1430 (.104")............................1450 (.070" x .042") ..............................Rod & Jet
20....................1426 (.095")............................1445 (.065" x .047") ..............................Rod & Jet
21....................1427 (.098")............................1452 (.070" x .052") ..............................Rod & Jet
22....................1428 (.100")............................1457 (.073" x .052") ..............................Rod
23....................1428 (.100")............................1455 (.073" x .042") ..............................Rod
24....................1427 (.098")............................1457 (.073" x .052") ..............................Rod & Jet
25....................1428 (.100")............................1459 (.075" x .047") ..............................Rod
26....................1427 (.098")............................1449 (.070" x .037") ..............................Rod & Jet
27....................1426 (.095")............................1446 (.068" x .042") ..............................Rod & Jet
28....................1427 (.098")............................1456 (.073" x .047") ..............................Rod & Jet
29....................1427 (.098")............................1455 (.073" x .042") ..............................Rod & Jet
30....................1429 (.101")............................1458 (.075" x .037") ..............................Rod & Jet



Model #1406
ROD/JET REFERENCE CHART
REF # MAIN JET METERING ROD CHANGE FROM BASE
1....................1427 (.098")............................1459 (.075" x .047") ..............................none - stock calibration
2....................1426 (.095")............................1449 (.070" x .037") ..............................Rod & Jet
3....................1427 (.098")............................1458 (.075" x .037") ..............................Rod
4 ..................1425 (.092")............................1446 (.068" x .042") ..............................Rod & Jet
5....................1426 (.095")............................1453 (.071" x .047") ..............................Rod & Jet
6....................1425 (.092")............................1447 (.068" x .047") ..............................Rod & Jet
7....................1426 (.095")............................1456 (.073" x .047") ..............................Rod & Jet
8....................1426 (.095")............................1455 (.073" x .042") ..............................Rod & Jet
9....................1426 (.095")............................1454 (.073" x .037") ..............................Rod & Jet
10....................1425 (.092")............................1451 (.070" x .047") ..............................Rod & Jet
11....................1425 (.092")............................1453 (.071" x .047") ..............................Rod & Jet
12....................1426 (.095")............................1459 (.075" x .047") ..............................Jet
13....................1425 (.092")............................1449 (.070" x .037") ..............................Rod & Jet
14....................1426 (.095")............................1458 (.075" x .037") ..............................Rod & Jet
15....................1426 (.095")............................1448 (.068" x .052") ..............................Rod & Jet
16....................1426 (.095")............................1447 (.068" x .047") ..............................Rod & Jet
17....................1427 (.098")............................1453 (.071" x .047") ..............................Rod
18....................1429 (.101")............................1459 (.075" x .047") ..............................Jet
19....................1427 (.098")............................1449 (.070" x .037") ..............................Rod
20....................1425 (.092")............................1445 (.065" x .047") ..............................Rod & Jet
21....................1426 (.095")............................1451 (.070" x .047") ..............................Rod & Jet
22....................1426 (.095")............................1446 (.068" x .042") ..............................Rod & Jet
23....................1427 (.098")............................1455 (.073" x .042") ..............................Rod
24....................1427 (.098")............................1456 (.073" x .047") ..............................Rod
25....................1427 (.098")............................1454 (.073" x .037") ..............................Rod

Model #1407 & #1410
ROD/JET REFERENCE CHART
REF # MAIN JET METERING ROD CHANGE FROM BASE
1....................1433 (.113")............................1453 (.071" x .047") ..............................none - stock calibration
2....................1433 (.113")............................1450 (.070" x .042") ..............................Rod
3....................1433 (.113")............................1449 (.070" x .037") ..............................Rod
4 ..................1434 (.116")............................1454 (.073" x .037") ..............................Rod & Jet
5....................1431 (.107")............................1443 (.063" x .047") ..............................Rod & Jet
6....................1432 (.110")............................1445 (.065" x .047") ..............................Rod & Jet
7....................1433 (.113")............................1452 (.070" x .052") ..............................Rod
8....................1432 (.110")............................1441 (.062" x .052") ..............................Rod & Jet
9....................1433 (.113")............................1447 (.068" x .047") ..............................Rod
10....................1434 (.116")............................1456 (.073" x .047") ..............................Rod & Jet
11....................1432 (.110")............................1443 (.063" x .047") ..............................Rod & Jet
12....................1433 (.113")............................1445 (.065" x .047") ..............................Rod
13....................1434 (.116")............................1453 (.071" x .047") ..............................Jet
14....................1434 (.116")............................1449 (.070" x .037") ..............................Rod & Jet
15....................1433 (.113")............................1443 (.063" x .047") ..............................Rod
16....................1433 (.113")............................1442 (.063" x .037") ..............................Rod
17....................1434 (.116")............................1444 (.065" x .037") ..............................Rod & Jet
18....................1432 (.110")............................1452 (.070" x .052") ..............................Rod & Jet
19....................1433 (.113")............................1457 (.073" x .052") ..............................Rod
20....................1433 (.113")............................1456 (.073" x .047") ..............................Rod
21....................1433 (.113")............................1454 (.073" x .037") ..............................Rod
22....................1431 (.107")............................1445 (.065" x .047") ..............................Rod & Jet
23....................1431 (.107")............................1444 (.065" x .037") ..............................Rod & Jet
24....................1432 (.110")............................1449 (.070" x .037") ..............................Rod & Jet
25....................1431 (.107")............................1447 (.068" x .047") ..............................Rod & Jet
26....................1432 (.110")............................1456 (.073" x .047") ..............................Rod & Jet
27....................1432 (.110")............................1454 (.073" x .037") ..............................Rod & Jet
 
Last edited by a moderator:
Re: setting float levels on and correcting a rich edelbrock

Im surprised grumpyvette did not mention the time when I brought a buddy over that had a dual quad set-up on his 390 ford in a 1967 fairlane 500
seems it always ran far richer than he intended ,
he had been swapping fuel pumps, and he had purchased needle and seat valves, but had no idea how to install them,, and was out looking for someone to help and trying to reset the float levels, a quick check showed the tips of the metering rods had been snipped off with wire cutters, it seems the guy got tired of trying to jiggle them to get them to drop thru the jets so ,not having a clue about the function or reason for the tapered ends on the metering rods or their function as flow regulators in the jets he had just snipped them off short enough so they installed easily.
grumpyvette found that problem in about 10 minutes after use of the infrared temp gun and reading plugs led him right to the cause. He then explained exactly what those rods did and replaced them, resulting in a far smoother running car and an easy boost in mid and upper rpm power that was very noticeable from the drivers seat!
 
Model #1409
ROD/JET REFERENCE CHART
REF # MAIN JET METERING ROD CHANGE FROM BASE
1....................1427 (.098")............................1447 (.068" x .047") ..............................none - stock calibration
2....................1427 (.098")............................1446 (.068" x .042") ..............................Rod
3....................1429 (.101")............................1456 (.073" x .047") ..............................Rod & Jet
4....................1427 (.098")............................1450 (.070" x .042") ..............................Rod
5....................1427 (.098")............................1451 (.070" x .047") ..............................Rod
6....................1427 (.098")............................1452 (.070" x .052") ..............................Rod
7....................1426 (.095")............................1443 (.063" x .047") ..............................Rod & Jet
8....................1426 (.095")............................1460 (.065" x .052") ..............................Rod & Jet
9....................1425 (.092")............................1443 (.063" x .047") ..............................Rod & Jet
10....................1426 (.095")............................1452 (.070" x .052") ..............................Rod & Jet
11....................1426 (.095")............................1447 (.068" x .047") ..............................Jet
12....................1425 (.092")............................1444 (.065" x .037") ..............................Rod & Jet
13....................1427 (.098")............................1456 (.073" x .047") ..............................Rod
14....................1429 (.101")............................1459 (.075" x .047") ..............................Rod & Jet
15....................1427 (.098")............................1454 (.073" x .037") ..............................Rod
16....................1429 (.101")............................1458 (.075" x .037") ..............................Rod & Jet
17....................1430 (.104")............................1459 (.075" x .047") ..............................Rod & Jet
18....................1430 (.104")............................1456 (.073" x .047") ..............................Rod & Jet
19....................1427 (.098")............................1444 (.065" x .037") ..............................Rod
20....................1429 (.101")............................1451 (.070" x .047") ..............................Rod & Jet
21....................1427 (.098")............................1445 (.065" x .047") ..............................Rod
22....................1427 (.098")............................1460 (.065" x .052") ..............................Rod
23....................1426 (.095")............................1441 (.062" x .052") ..............................Rod & Jet
24....................1426 (.095")............................1439 (.060" x .052") ..............................Rod & Jet
25....................1426 (.095")............................1438 (.058" x .052") ..............................Rod & Jet
26....................1427 (.098")............................1441 (.062" x .052") ..............................Rod
27....................1427 (.098")............................1443 (.063" x .047") ..............................Rod
28....................1429 (.101")............................1462 (.067" x .049") ..............................Rod & Jet
29....................1430 (.104")............................1452 (.070" x .052") ..............................Rod & Jet
#1409 Calibration Reference Chart / Primary Metering
Main Jet I.D.—All Edelbrock jets have “120-”prefix. The
last three digits minus 300 = actual jet size.
Examples: 120-398 = .098" jet (Edelbrock p/n 1427).
120-401 = .113" jet (Edelbrock p/n 1433).


Model #1411
ROD/JET REFERENCE CHART
REF # MAIN JET METERING ROD CHANGE FROM BASE
1....................1432 (.110")............................1459 (.075" x .047") ..............................none - stock calibration
2....................1432 (.110")............................1419 (.075" x .042") ..............................Rod
3....................1432 (.110")............................1458 (.075" x .037") ..............................Rod
4 ..................1431 (.107")............................1454 (.073" x .037") ..............................Rod & Jet
5....................1431 (.107")............................1456 (.073" x .047") ..............................Rod & Jet
6....................1431 (.107")............................1457 (.073" x .052") ..............................Rod & Jet
7....................1430 (.104")............................1445 (.065" x .047") ..............................Rod & Jet
8....................1430 (.104")............................1416 (.065" x .042") ..............................Rod & Jet
9....................1430 (.104")............................1444 (.065" x .037") ..............................Rod & Jet
10....................1432 (.110")............................1456 (.073" x .047") ..............................Rod
11....................1432 (.110")............................1455 (.073" x .042") ..............................Rod
12....................1432 (.110")............................1454 (.073" x .037") ..............................Rod
13....................1431 (.107")............................1447 (.068" x .047") ..............................Rod & Jet
14....................1431 (.107")............................1448 (.068" x .052") ..............................Rod & Jet
15....................1431 (.107")............................1458 (.075" x .037") ..............................Rod & Jet
16....................1430 (.104")............................1449 (.070" x .037") ..............................Rod & Jet
17....................1430 (.104")............................1450 (.070" x .042") ..............................Rod & Jet
18....................1430 (.104")............................1451 (.070" x .047") ..............................Rod & Jet
19....................1430 (.104")............................1453 (.071" x .047") ..............................Rod & Jet
20....................1432 (.110")............................1418 (.070" x .057") ..............................Rod
21....................1432 (.110")............................1452 (.070" x .052") ..............................Rod
22....................1432 (.110")............................1453 (.071" x .047") ..............................Rod
23....................1432 (.110")............................1450 (.070" x .042") ..............................Rod
24....................1432 (.110")............................1449 (.070" x .037") ..............................Rod
25....................1432 (.110")............................1417 (.068" x .057") ..............................Rod
26....................1432 (.110")............................1448 (.068" x .052") ..............................Rod
27....................1432 (.110")............................1447 (.068" x .047") ..............................Rod
28....................1432 (.110")............................1446 (.068" x .042") ..............................Rod
29....................1433 (.113")............................1455 (.073" x .042") ..............................Rod & Jet
Main Jet I.D.—All Edelbrock jets have “120-”prefix. The
last three digits minus 300 = actual jet size.
Examples: 120-398 = .098" jet (Edelbrock p/n 1427).
120-413 = .113" jet (Edelbrock p/n 1433).
Step 1 Select the combination of Cruise Mode and
Power Mode fuel-metering stages desired for
your calibration. Normal calibration changes
will be within the shaded diagonal area. That is,
Cruise and Power mode changes should be in
the same direction (either richer or leaner) and
usually by the same amount.
Step 2 Find the number that is nearest your desired
combination. This is your Calibration
Reference Number.
Step 3 Find the Calibration Reference Number you have
just selected in Step 2. Listed will be the Main Jet
and Metering Rod required to achieve the desired
fuel metering for the Primaries.
#1411 Calibration Reference Chart / Primary Metering
Stock Calibration
Numbers in black are the steps obtainable
using Calibration Kit #1489 plus the stock jets
and metering rods.
Numbers in white are the steps obtainable using jet
and rod combinations shown on this

http://garage.grumpysperformance.com/index.php?threads/edelbrock-carb-rebuild-related.15406/
Model #1412 & #1413
ROD/JET REFERENCE CHART
REF # MAIN JET METERING ROD CHANGE FROM BASE
1....................1433 (.113")............................1453 (.071" x .047") ..............................none - stock calibration
2....................1433 (.113")............................1450 (.070" x .042") ..............................Rod
3....................1433 (.113")............................1449 (.070" x .037") ..............................Rod
4 ..................1434 (.116")............................1454 (.073" x .037") ..............................Rod & Jet
5....................1431 (.107")............................1443 (.063" x .047") ..............................Rod & Jet
6....................1432 (.110")............................1445 (.065" x .047") ..............................Rod & Jet
7....................1433 (.113")............................1452 (.070" x .052") ..............................Rod
8....................1432 (.110")............................1441 (.062" x .052") ..............................Rod & Jet
9....................1433 (.113")............................1447 (.068" x .047") ..............................Rod
10....................1434 (.116")............................1456 (.073" x .047") ..............................Rod & Jet
11....................1432 (.110")............................1443 (.063" x .047") ..............................Rod & Jet
12....................1433 (.113")............................1445 (.065" x .047") ..............................Rod
13....................1434 (.116")............................1453 (.071" x .047") ..............................Jet
14....................1434 (.116")............................1449 (.070" x .037") ..............................Rod & Jet
15....................1433 (.113")............................1443 (.063" x .047") ..............................Rod
16....................1433 (.113")............................1442 (.063" x .037") ..............................Rod
17....................1434 (.116")............................1444 (.065" x .037") ..............................Rod & Jet
18....................1432 (.110")............................1452 (.070" x .052") ..............................Rod & Jet
19....................1433 (.113")............................1457 (.073" x .052") ..............................Rod
20....................1433 (.113")............................1456 (.073" x .047") ..............................Rod
21....................1433 (.113")............................1454 (.073" x .037") ..............................Rod
22....................1431 (.107")............................1445 (.065" x .047") ..............................Rod & Jet
23....................1431 (.107")............................1444 (.065" x .037") ..............................Rod & Jet
24....................1432 (.110")............................1449 (.070" x .037") ..............................Rod & Jet
25....................1431 (.107")............................1447 (.068" x .047") ..............................Rod & Jet
26....................1432 (.110")............................1456 (.073" x .047") ..............................Rod & Jet
27....................1432 (.110")............................1454 (.073" x .037") ..............................Rod & Jet
#1412 & #1413 Calibration Reference Chart / Primary Metering
Step 1 Select the combination of Cruise Mode and
Power Mode fuel-metering stages desired for
your calibration. Normal calibration changes
will be within the shaded diagonal area. That is,
Cruise and Power mode changes should be in
the same direction (either richer or leaner) and
usually by the same amount.
Step 2 Find the number that is nearest your desired
combination. This is your Calibration
Reference Number.
Step 3 Find the Calibration Reference Number you have
just selected in Step 2. Listed will be the Main Jet
and Metering Rod required to achieve the desired
fuel metering for the Primaries.
Main Jet I.D.—All Edelbrock jets have “120-”prefix. The
last three digits minus 300 = actual jet size.
Examples: 120-398 = .098" jet (Edelbrock p/n 1427).
120-413 = .113" jet (Edelbrock p/n 1433).
Secondary Metering
The factory calibration jet is shown in the center column.
For leaner or richer calibration use the jet # indicated in the
appropriate column.
3 Stages Lean (12%) JET #1425 (.092")
2 Stages Lean (8%) JET #1426 (.095")
1 Stage Lean (4%) JET #1427 (.098")
SECONDARY Stock Calibration JET #1429 (.101")
1 Stage Rich (4%) JET #1430 (.104")
2 Stages Rich (8%) JET #1431 (.107")
3 Stages Rich (12%) JET #1432 (.110")
Stock Calibration
Numbers in black are the steps obtainable
using Calibration Kit #1480 plus the stock jets
and metering rods.
Numbers in white are the steps obtainable using jet
and rod combinations shown on this page.
17
Main Jet I.D.—All Edelbrock jets have “120-”prefix. The
last three digits minus 300 = actual jet size.
Examples: 120-398 = .098" jet (Edelbrock p/n 1427).
120-413 = .113" jet (Edelbrock p/n 1433).
Secondary Metering
The factory calibration jet is shown in the center column.
For leaner or richer calibration use the jet # indicated in the
appropriate column.
3 Stages Lean (12%) JET #1424 (.089")
2 Stages Lean (8%) JET #1425 (.092")
1 Stage Lean (4%) JET #1426 (.095")
SECONDARY Stock Calibration JET #1427 (.098")
1 Stage Rich (4%) JET #1429 (.101")
2 Stages Rich (8%) JET #1430 (.104")
3 Stages Rich (12%) JET #1431 (.107")
#1805 / #1806 Calibration Reference Chart / Primary Metering
Step


Model #1805 & #1806
ROD/JET REFERENCE CHART
REF# MAIN JET METERING ROD CHANGE FROM BASE
1....................1426 (.095") ...........................1447 (.068" x .047") ..............................None-stock calibration
2....................1426 (.095") ...........................1446 (.068" x .042") ..............................Rod
3....................1426 (.095") ...........................1448 (.068" x .052") ..............................Rod
4....................1425 (.092") ...........................1443 (.063" x .047") ..............................Jet and Rod
5....................1427 (.098") ...........................1453 (.071" x .047") ..............................Jet and Rod
6....................1426 (.095") ...........................1462 (.067" x .049") ..............................Rod
7....................1426 (.095") ...........................1444 (.065" x .037") ..............................Rod
8....................1426 (.095") ...........................1416 (.065" x .042") ..............................Rod
9....................1426 (.095") ...........................1445 (.065" x .047") ..............................Rod
10....................1426 (.095") ...........................1460 (.065" x .052") ..............................Rod
11....................1427 (.098") ...........................1447 (.068" x .047") ..............................Jet
12....................1427 (.098") ...........................1448 (.068" x .052") ..............................Jet and Rod
13....................1427 (.098") ...........................1436 (.068" x .057") ..............................Jet and Rod
14....................1427 (.098") ...........................1456 (.073" x .047") ..............................Jet and Rod
15....................1425 (.092") ...........................1444 (.065" x .037") ..............................Jet and Rod
16....................1425 (.092") ...........................1416 (.065" x .042") ..............................Jet and Rod
17....................1425 (.092") ...........................1445 (.065" x .047") ..............................Jet and Rod
18....................1426 (.095") ...........................1450 (.070" x .042") ..............................Rod
19....................1426 (.095") ...........................1451 (.070" x .047") ..............................Rod
20....................1426 (.095") ...........................1452 (.070" x .052") ..............................Rod
21....................1427 (.098") ...........................1419 (.075" x .047") ..............................Jet and Rod
22....................1424 (.089") ...........................1442 (.063" x .037") ..............................Jet and Rod
Stock Calibration
Numbers in black are the steps obtainable
using Calibration Kit #1840 plus the stock jets
and metering rods.
Numbers in white are the steps obtainable using jet
and rod combinations shown on this


Model #1812 & #1813
ROD/JET REFERENCE CHART
REF# MAIN JET METERING ROD CHANGE FROM BASE
1....................1433 (.113") ...........................1447 (.068" x .047") ..............................None- stock calibration
2....................1433 (.113") ...........................1446 (.068" x .042") ..............................Rod
3....................1434 (.116") ...........................1455 (.073" x .042") ..............................Jet and Rod
4....................1433 (.113") ...........................1448 (.068" x .052") ..............................Rod
5....................1433 (.113") ...........................1436 (.068" x .057") ..............................Rod
6....................1433 (.113") ...........................1444 (.065" x .037") ..............................Rod
7....................1433 (.113") ...........................1446 (.065" x .042") ..............................Rod
8....................1433 (.113") ...........................1445 (.065" x .047") ..............................Rod
9....................1434 (.116") ...........................1418 (.070" x .057") ..............................Jet and Rod
10....................1433 (.113") ...........................1461 (.065" x .057") ..............................Rod
11....................1433 (.113") ...........................1442 (.063" x .037") ..............................Rod
12....................1433 (.113") ...........................1443 (.063" x .047") ..............................Rod
13....................1434 (.116") ...........................1436 (.068" x .057") ..............................Jet and Rod
14....................1434 (.116") ...........................1462 (.067" x .049") ..............................Jet and Rod
15....................1434 (.116") ...........................1416 (.065" x .042") ..............................Jet and Rod
16....................1434 (.116") ...........................1461 (.065" x .057") ..............................Jet and Rod
17....................1433 (.113") ...........................1449 (.070" x .037") ..............................Rod
18....................1433 (.113") ...........................1450 (.070" x .042") ..............................Rod
19....................1433 (.113") ...........................1451 (.070" x .047") ..............................Rod
20....................1433 (.113") ...........................1452 (.070" x .052") ..............................Rod
21....................1433 (.113") ...........................1418 (.070" x .057") ..............................Rod
22....................1432 (.110") ...........................1462 (.067" x .049") ..............................Jet and Rod
23....................1431 (.107") ...........................1442 (.063" x .037") ..............................Jet and Rod
24....................1433 (.113") ...........................1456 (.073" x .047") ..............................Rod
25....................1433 (.113") ...........................1455 (.073" x .042") ..............................Rod
26....................1433 (.113") ...........................1454 (.073" x .037") ..............................Rod
Main Jet I.D.—All Edelbrock jets have “120-”prefix. The
last three digits minus 300 = actual jet size.
Examples: 120-398 = .098" jet (Edelbrock p/n 1427).
120-413 = .113" jet (Edelbrock p/n 1433).


Model #1825 & #1826
ROD/JET REFERENCE CHART
REF# MAIN JET METERING ROD CHANGE FROM BASE
1....................1426 (.095") ...........................1445 (.065" x .047") ..............................None- stock calibration
2....................1426 (.095") ...........................1416 (.065" x .042") ..............................Rod
3....................1426 (.095") ...........................1444 (.065" x .037") ..............................Rod
4....................1426 (.095") ...........................1460 (.065" x .052") ..............................Rod
5....................1426 (.095") ...........................1442 (.063" x .037") ..............................Rod
6....................1427 (.098") ...........................1447 (.068" x .047") ..............................Jet and Rod
7....................1426 (.095") ...........................1443 (.063" x .047") ..............................Rod
8....................1427 (.098") ...........................1436 (.068" x .057") ..............................Jet and Rod
9 ..................1427 (.098") ...........................1463 (.067" x .055") ..............................Jet and Rod
10....................1426 (.095") ...........................1441 (.062" x .052") ..............................Rod
11....................1427 (.098") ...........................1445 (.065" x .047") ..............................Jet
12....................1429 (.101") ...........................1418 (.070" x .057") ..............................Jet and Rod
13....................1426 (.095") ...........................1439 (.060" x .052") ..............................Rod
14....................1427 (.098") ...........................1453 (.071" x .047") ..............................Jet and Rod
15....................1425 (.092") ...........................1442 (.063" x .037") ..............................Jet and Rod
16....................1426 (.095") ...........................1462 (.067" x .049") ..............................Rod
17....................1425 (.092") ...........................1443 (.063" x .047") ..............................Jet and Rod
18....................1426 (.095") ...........................1446 (.068" x .042") ..............................Rod
19....................1426 (.095") ...........................1447 (.068" x .047") ..............................Rod
20....................1426 (.095") ...........................1448 (.068" x .052") ..............................Rod
 
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THANK YOU!
Ive been meaning to post, for awhile now.
I was having a good deal of difficulty tuning my EDELBROCK carb,
after learning how to set the floats correctly and checking the fuel pressure,
(thanks for the tips)
I looked thru the chart, ordered the metering rods I needed to lean out the idle and after installing and testing,
my running a bit to rich issues vanished.
the spark plugs look better and my 383 Plymouth is running better, than it has in a couple years.
 
Re: setting float levels on and correcting a rich edelbrock

IF anyone needs to refurbish an edelbrock carb, buy the book and read this BOOK, as a start point
nozzle.gif

a compressor and high pressure nozzles like this are great for clearing crud from internal carb passages and drying solvent but if not used very carefully they can throw small parts into another dimension never to be located again.
GET A FUEL PRESSURE GAUGE AND MEASURE DON,T GUESS
how can you possibly set up your fuel system unless you know the pressure and flow rates required and what currently exist's
vgauge.gif


READ LINKS

http://garage.grumpysperformance.com/index.php?threads/setting-up-your-fuel-system.211/

http://garage.grumpysperformance.com/index.php?threads/fuel-pressure-regulators.635/

http://garage.grumpysperformance.com/index.php?threads/how-big-a-fuel-pump-do-you-need.1939/

http://garage.grumpysperformance.co...ss-fuel-pressure-regulators.12776/#post-65998

http://www.edelbrock.com/automotive_new ... 0/1477.pdf

http://static.summitracing.com/global/i ... l-1477.pdf
verify SEVERAL TIMES THAT the REBUILD GASKET AND PARTS kit order fits YOUR CARB MODEL
http://www.summitracing.com/parts/EDL-1477/?rtype=1
edl-1477_w.jpg


edcarb.jpg


http://www.amazon.com/Rebuild-Modify-Ca ... 1932494367

fca29ho56-01_med.jpg

http://www.edelbrock.com/automotive/misc/tech-center/dl/carb-owners-manual.pdf

www.jegs.com/InstallationInstructions/300/350/350-1803.pdf

And for Carter AFBs:
http://www.carburetion.com/cartprice.asp

http://www.carburetion.com/Carter4.htm

http://www.carburetion.com/carbinf.htm



1, Get a carb kit for your carb. and one large disposable tin pan like they cook a 30 lb turkey in to work in and clean parts in
get a couple cans of carb cleaner
2, Have a clean flat place with ventalation to take it apart. A table/work bench that gas or carb cleaner solvents won't harm is a good idea.
3, Take it apart paying attension to small parts, where, and how everything came apart.
4, Once apart, clean it well with carb cleaner, be sure not to get the carb cleaner in your face. (and carb cleaner will let you know about any cuts you may or may not have known about)
5, With compressed air,and carb cleaner solvent blow through all the passages.
6, Open the kit and match all your gaskets EXACTLY.
7, Check your float in a container of GAS and be sure it actually floats, if in doubt, replace it.
8, Install the new gaskets and reinstall all the parts. Be sure any small metal balls, springs, pins etc. or plugs are reinstalled in the correct location.
9, Make sure any vacume canisters function correctly and don't leak.
10, Adjust things as the instruction sheet says and in the order it tells you to do it.
11, Install your rebuilt carb with a new base gasket, make final adjustments, cruise.


Edelbrock%20Exploded%201.png

Edelbrock%20Exploded%202.png
 
Last edited by a moderator:
I get a lot of questions about the AFB and how the jets and metering rods are related, so here we go.

http://www.carburetor-parts.com/AFB-Metering-Rods-Jets_ep_298.html


leanrichrodstep.jpg

The AFB, 4 barrel carburetor has 4 jets. Two matching primary and two matching secondaries. The Weber marine carburetor is an exception to this. On that carburetor the primary jets can be of different size and the two secondary jets will be a different size. The primary jets are usually a bigger size than the secondary jets. This is because the metering rods are used on the primary side of the jets, so the jets need to be bigger. This is the opposite from most 4 barrel carburetors, where the secondary jets are bigger than the primary.. The primary jets supply fuel for idle and 90% of part throttle. A two step metering rod is used to control the fuel on the primary side. The larger diameter of the rod is held in the jet at idle and low throttle when the vacuum is the strongest. As the throttle is opened and vacuum drops, the metering rod raises up and the smaller diameter is in the jet allowing more fuel to flow. AFB jets are usually stamped with the jet part number where 120- is the part number and the last 3 numbers is the jet size. 3xx is interpreted as .0xx. Replace the 3 with a 0, i.e. .088. When it is 4xx, replace the 4 with a 1, i.e. .102. When you can't read the jet you can use drill bits to measure the size. Use a go, no go to accurately nail the size down. Since the metering rods can be changed without taking the carburetor apart, they are usually the better choice when trying to adjust the lean, or rich condition. Change the metering rod one size at a time until you reach the desired results. If you don't get what you need using the last size metering rod, then you will need to consider changing the jet size. To get to an approximate size relationship between the jet and the metering rod subtract the rod diameter from the jet diameter of the last combination, then subtract that total from the new jet diameter, which will then give you a new metering rod diameter. Example: Jet is .098 and the rod is .076. .098-.076 is .022. To go leaner you select a jet size of .096. .096-.022 equals a .074 rod size. The exact area calculation would get your a .068 rod size.During part throttle operation, manifold vacuum overcomes the tension of the step-up piston spring and pulls the step-up piston and assembly down, holding the large diameter of the step-up ord in the main metering jet. Fuel then flows through the jet and around the metering rod at a reduced volume. During acceleration and under load, the tension of the spring overcomes the pull of vacuum under the piston, the step-up rod will move up so its smaller diameter, or power step is in the jet. Fuel then flows through the jet and around the metering rod at a higher volume.


airenterspower.jpg


In the illustration A indicates a bleed which prevents a rich condition and bog when the high speed circuit is reinitiated after deceleration.The wrong step up piston spring or using a spring that has been stretched out of shape can eratic carburetor behavior at low and high speeds. We sell the metering springs in full sets, which allows you to experiement. For the best running conditions at both low and high speeds, use the lightest spring that you can and still get the best performance from your carburetor.
A couple of other things to look for when you aren't getting the performance you expect is a clogged air bleed or main vent tube, which would cause a rich condition. A float with an incorrect setting will also cause poor performance at higher speeds.Buy your metering rod springs here.

 
JOHN HA said:
I love my Edelbrock carb but I had issues when I was trying to follow the Edelbrock manual to select a rod and jet combination to make a small change. It seemed to me that the steps in the manual were too large to really fine tune the carb.

So I did what any good engineer would do
happy.png

- I created a spreadsheet that calculated the areas of different rod and jet combinations. This allowed me to choose a rod and jet combination that was slightly richer or leaner either in "cruise" or "power" while minimally affecting the other setting ("power" or "cruise").

I sorted the information and added some instructions to the bottom of the sheet. The information covers the 1403, 1405 and 1406 Edelbrock carburetors specifically and can also be used for other models.

xfawbaa.jpg
Click to expand...
1805chart.jpg

1406chart.jpg

1405chart.jpg
 
Like Brian said, use a fine wire, carb cleaner, and compressed air.
Do where I circled in the pic, and remove the idle mixture screws and do there as well.
Nothing needs to be disassembled to do this.
If this does not cure it, the problem is deeper inside.
index.php
 

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I used it to tune the TT and it did a fantastic job. When I raced, I had it mounted to the dash and it recorded data as I ran to make sure I never went lean with the centrifugal.

It's a FAST, IIRC.
 
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