Hi from Germany

Shouldn't have any trouble with the mount breaking! ;)

You might take a look at SpeedHut gauges, you can customize how the look. I love mine, my
analog/digital speedometer can record time for 0-60 mph and 1/4 miles times, along with
many other parameters. They have a life time warranty.

https://www.speedhut.com/gauges/

Functions.jpg
 
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I use a Digital Speedometer phone app I downloaded onto my Cellphone. It was Free.
Checked against my 87 Corvette Digital Speedo its Dead On accurate.
Checked against my Garmin and dead on.
In the Corvette 151 mph on my Cellphone speedo App read off.
In my 1963 Grand Prix 130 mph read off.
 
1/4 mile does not matter much till you hit the track.
Street Outlaws today is 1/8 mile.
Can be a full mile long.
Brute power and hooking up fast on Dirty unprepped roads is it without spinning out or going sideways above 100 mph.
 
OK I solved the off idle stumble. Ich changed the Power Valve from 4.5 to 6.5 and changed the primary squirter from 31 to 35. Now I have a good acceleration power. But not solved the brake problem :(
 
I found the problem, the master brake cylinder is damaged. It is bleeding between the mc and the booster. I ordered a new MC.
 
So the brake problem is solved. Now I have good brake pressure. I ordered a 1" MC, bench bleed it an installed it. After bleeding all corners and especially at the front discs on both bleeders per side the brake work great.
So now I can get on the road and track to see how the new performance work and to fine tune the carb.
 
We did a reliability Run around 150 miles with 16 cars on saturday. Was fun. The chevy did it with no real problem.
I still have an off idle stumble and a lean spot between 2.700 - 3.200 rpm in 4th gear (50 - 57 mph).
Same reaction like the off idle stumble, the engine leans out to AFR 18.2 start to stumble and a second later I got a kick and it runs fast and the engine goes to the rich side AFR 10.9 - 11.3.
I have 35 squirters in, primary blue acc cam, secondary acc is white acc cam (original was orange and pink). 9.5 power valve (factory set up was 4.5). No change on jets or bleeders.
 
We did a reliability Run around 150 miles with 16 cars on saturday. Was fun. The chevy did it with no real problem.
I still have an off idle stumble and a lean spot between 2.700 - 3.200 rpm in 4th gear (50 - 57 mph).
Same reaction like the off idle stumble, the engine leans out to AFR 18.2 start to stumble and a second later I got a kick and it runs fast and the engine goes to the rich side AFR 10.9 - 11.3.
I have 35 squirters in, primary blue acc cam, secondary acc is white acc cam (original was orange and pink). 9.5 power valve (factory set up was 4.5). No change on jets or bleeders.
Try a #37 primary squirter.
Hot engines or Big Blocks tolerate Big Pump shots & Like it.

Use a 50cc Kit on my 770 cfm street avenger Holley.
#37 squirter.
425 Olds Rocket V8 in my 63 Pontiac Gp.
Had a terrible Bog Till I gave it what it wanted.....Huge shot of Gasoline.
 
50cc Kit on both sides or only on the primary side? Overall the engines runs a bit rich AFR 12.2 - 13.1. WOT is 11.9 - 12.3

If the new water temp gauge shows correct numbers, the engine runs a bit too cold, max is 150 F. Most of the time 110 - 140 F. I will try another thermostat.
 
50cc Kit on both sides or only on the primary side? Overall the engines runs a bit rich AFR 12.2 - 13.1. WOT is 11.9 - 12.3

If the new water temp gauge shows correct numbers, the engine runs a bit too cold, max is 150 F. Most of the time 110 - 140 F. I will try another thermostat.
Primary only 50cc kit on mine.
 
OK, today I checked my timing, I retimed the ignition and corrected the vacuum advance. The stumble is softer now, but the AFR told me numbers around 18 at 2.500 - 2.800 rpm at soft accelration. WOT is 12.4. Hard acceleration from cruise is between 13.4-14.3. Idle is around 13.6 at 900 rpm

I think about changing the secondary acc pump cam to the orange one. What you guys think?
 
OK, today I checked my timing, I retimed the ignition and corrected the vacuum advance. The stumble is softer now, but the AFR told me numbers around 18 at 2.500 - 2.800 rpm at soft accelration. WOT is 12.4. Hard acceleration from cruise is between 13.4-14.3. Idle is around 13.6 at 900 rpm

I think about changing the secondary acc pump cam to the orange one. What you guys think?
50 CC Big Nuts Accelerator pump kit.
#37 squirters.
A Master Holley Jet pack Kit.
Or from AED or BoLaws BLP.

The should be an AED Hi Flow Power Valve in your AED HO.
If you changed it out buy the correct Power Valve from AED & a Hi Flow unit.
 
Ok, I try it with 50cc. I thought at soft acceleration there is no pump shot, so the pump brings no advantage.
 
Ok, I try it with 50cc. I thought at soft acceleration there is no pump shot, so the pump brings no advantage.
50cc accelerator pump kit works like a big Water Tank.
Not used till heavy WOT .
Pump discharge nozzle size detetmines actual size shot.
Give it a Big Shot.
Works everytime with a Performance Holley Carb.
 
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Ok, I try it with 50cc. I thought at soft acceleration there is no pump shot, so the pump brings no advantage.
If you got all the different cams for accelerator pump, why not try the fastest acting cam to
see if it helps before you buy the 50cc pump. From your earlier posts, it seems like you
have all the cams. I agree with you in that if you are easing into the throttle, then it's not
about the total pump volume, but about the timing and flow from the pump.

You have set the clearance between the pump arm and the diaphragm .....right? If it's too
wide, then that will delay the start of the pump shot.
 
spending a couple hours reading links and sub-links would do a great amount of good here and help sort out the problems, keep in mind that its a SYSTEM, what goes in is locked into the calcs
and all the math and related factors are well known, and easily calculated based on displacement, cam timing , exhaust back pressure head flow, exhaust flow , etc.
volumetric.gif

exhaustpressure.jpg

EXFLOWZ4.jpg

137998aa.jpg

tubsed.png

expik.png

one of the most common and least tested, factors in most engine build ups is testing for restrictions to building increased horsepower. a huge problem is in restrictive exhaust systems that can not effectively allow the headers to scavenge the burnt gases from the cylinders, a good open collector on a well designed header can reduce the back pressure at the exhaust port to a negative pressure significantly increasing cylinder scavenging out the exhaust, thus helping draw in a fresh intake charge.
COMMON SBC INTAKE PORTS
felpro # 1204=Port Size: 1.23" x 1.99"=2.448 sq inches

felpro # 1205=Port Size: 1.28" x 2.09"=2.67 sq inches

felpro # 1206=Port Size: 1.34" x 2.21"=2.96 sq inches

felpro # 1207=Port Size: 1.38" x 2.28"=3.146 sq inches

felpro # 1209=Port Size: 1.38" x 2.38"=3.28 sq inches

felpro # 1255 VORTEC=Port Size: 1.08" x 2.16"-2.33 sq inches

felpro # 1263=Port Size: 1.31" x 2.02"=2.65 sq inches

felpro # 1266=Port Size: 1.34" x 2.21"=2.96 sq inches

felpro # 1284 LT1=Port Size: 1.25 x 2.04''=2.55 sq inches

felpro # 1289 FASTBURN=Port Size: 1.30" x 2.31" 3.00 sq inches

USE THE CALCULATORS, YOULL, QUICKLY FIND THE LIMITATIONS
http://www.rbracing-rsr.com/runnertorquecalc.html
http://www.wallaceracing.com/chokepoint.php
http://www.wallaceracing.com/header_length.php

the valve curtain area, cam duration and lift controlling that curtain area,or port cross sectional area will pose a restriction to air flow at some point,in the engines rpm band, but you can extend the effective air flow duration and efficiency with carefully timed exhaust scavenging, that helps draw in the intake runner inertia load of air/fuel,charge much more effectively if the peak negative pressure wave is correctly timed
portfl3.jpg

http://garage.grumpysperformance.com/index.php?threads/the-new-215cc-vortec-heads.266/#post-75012

http://garage.grumpysperformance.com/index.php?threads/carburetor-intake-manifold-test.58/

http://garage.grumpysperformance.com/index.php?threads/holley-accelerator-pumps-cams.1790/

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

http://garage.grumpysperformance.com/index.php?threads/holley-carb-power-valves.1639/

http://garage.grumpysperformance.com/index.php?threads/cooler-denser-air.8961/

http://garage.grumpysperformance.com/index.php?threads/car-falls-flat-in-third-gear.9326/

http://garage.grumpysperformance.co...-the-holley-4150-and-4160-series-carbs.10736/

http://garage.grumpysperformance.com/index.php?threads/carb-tuning-info-and-links.109/

http://garage.grumpysperformance.com/index.php?threads/is-backpressure-hurting-your-combo.495/

http://garage.grumpysperformance.com/index.php?threads/calculating-required-exhaust-pipe-size.11552/

http://garage.grumpysperformance.com/index.php?threads/building-an-exhaust-system-for-your-car.1166/
 
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If you got all the different cams for accelerator pump, why not try the fastest acting cam to
see if it helps before you buy the 50cc pump. From your earlier posts, it seems like you
have all the cams. I agree with you in that if you are easing into the throttle, then it's not
about the total pump volume, but about the timing and flow from the pump.

You have set the clearance between the pump arm and the diaphragm .....right? If it's too
wide, then that will delay the start of the pump shot.

Yes I have all cams (I have two of each cam). Thats a good advice. But I ordered the 50cc yesterday (from Canada, there is a shop I had good experience with and they had the best price incl. shipping).

Grumpy, the Hooker headers have 1 5/8" oval ports, the exhaust has 2 1/4" pipes (thats what I calculated to use). The H Pipe is behind the trans. The Smithy's Mufflers are at the nearest point to the rear end. I can try to open the cut outs and see how the engine reacts on nearly no backpressure. On higher rpm's it sounds sometimes that I have a exhaust leak, but only sometimes. I ordered a new Remflex header gasket and I also want to cut the header flange so each pipe has good contact to the head.

My main problem is to get the parts, most of them I can buy here in Germany, but there are expensive. An example, I can buy a thermostat here for the price that I can order 3 from an american parts store (like Summit Racing, Jeg's, Speedway Motors or Rockauto) inclusive shipping cost. The shipping cost are often double the price of the part, sometimes more.
But I have to wait 2-3 weeks to get the parts from overseas. If I order here it take 1-3 days.
So everytime I have to weighing up if I can wait or if I pay more for the parts.
That brings sometimes huge delays on the project. I don't have a huge storage room or the money to order many parts that I may can use in the future ;). I wish I could.
 
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