The Force Awakens...

yes 12 psi is absurdly over pressure and its almost certainly causing flooding , 5 psi is about ideal.

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

your carburetor inlet fuel pressure should be a consistent 5 psi-5.5 psi in most cases, once you get over 6 psi you'll find the carburetor float bowls tend to flood and under 3 psi the carburetor can run lean under hard acceleration.
keep in mind the internal port size is not all that large on the cheap holley fuel pressure regulators , so they work ok on near stock applications but NOT on anything close to a race application.
holleyfpr11a.jpg


index.php
 
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Absolutely.

I canibalized the fuel pressure regulator from the Karmann Ghia put it in reverse and... the car died instantly.

I won’t bore you with the full story but I found the short and leaned a lesson. The short was a screw I stored inside the ashtray that fell into the Cigar Lighter socket. The lesson learned was the reaction time of blade fuses are much faster than the glass tube kind.

At first glance, the idle seems smoother and “dryer”.

BBS. I’m taking her for a spin.
 
Popping in the muffs: gone

Soooo much more comfortable to cruise at 50-60 mph.

The vacuum at idle is at 23 inches. The needle is stable. No longer fast swinging at +/- 5 inches.

SOP power seems a bit down tho.

Same plugs now... not new ones


4C128F07-9211-4653-A1B6-B6DA9A3885FA.jpeg 091C49CC-2916-4178-891C-2ABA7805F2C8.jpeg 7C1633B2-D31A-42F3-BC06-330EFE3F8931.jpeg
 
it looks like your burning far cleaner, but it will take time to burn off the previous ash and indications of combustion in the threaded ground ring surrounding the inner insulated ceramic
 
Wow those photo's take me to task, nothing I've taken is any better than those of the spark plugs and I use a tripod.
Amazing if you are holding them by hand and snapping the shot !!!!! DAMN that's good !!!

Glad you found a major problem!
 
Gents,

I am about to order a fuel pressure regulator from Summit. While I am at it, I think it makes sense to order some other bits and bobs like spark plugs and spark plug wires.

I have a new, decent quality HEI on there... I am thinking about picking up an MSD Street Fire CD box. Do you fellas think it's worth it ? Or for later and not a priority purchase?
 
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Spark plug cables - someone mentioned about 50 Ohms per foot. Is that overkill or preferable?
 
vastly preferable!
the lower the resistance the better,
anything over 100 ohms a foot is costing you performance.
but keep in mind some cars have electronics that are not properly shielded,
and require the crappy high resistance wires,
if you install the good wires and start having odd problems,
you might have related issues (very unlikely on a car with a carburetor)

http://garage.grumpysperformance.com/index.php?threads/ignition-wire-crimp-tool.2749/#post-25065

http://garage.grumpysperformance.co...-getting-the-header-clearance.840/#post-31540
personally I think one of the most over looked performance issues is wide spread use of crap quality ignition system components

FIREWIRE AND TAYLOR make decent ignition wire

https://www.jegs.com/p/FAST/FAST-FireWire-Spark-Plug-Wires/3542495/10002/-1

https://www.jegs.com/i/FAST/244/295-0081/10002/-1

https://www.summitracing.com/parts/tay-79602
 
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http://documents.msdperformance.com/5520.pdf

msdhei1.png

msdhei2.png

they work better than the stock HEI, but REQUIRE the matching coil to work correctly,
if you don,t get the ,matched ignition coil its not going too work to its potential.

talk to whom ever you order the multi spark ignition box ,
matching HEI, in the cap coil,
and ignition wires and plugs, parts from,
too get a matched set of compatible components
personally ID suggest calling the manufacturer's tech desk,
and getting a parts number list
(915) 857-5200
Id also ask about your particular application ,
and ask for and discuss ,
if they might suggest any upgrade or potential problems
 
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So, I pulled the trigger and probably will be experiencing buyer's remorse veeerrrry soon.

I decided to purchase the MSD Street Fighter CD box. The corvette is really to be a daily driver. I want the idle as smooth as I can get it, the plugs clean, quick starts and a cleaned up rev range. At this point, I am not after power. Brian, I understand and appreciate you flagging that MSDs do fail particularly the parts made in China. I'll take the gamble. From what I read, these parts either fail fast or live happily. Placement is important as well. Under the dash or under the hood makes a significant difference in durability as does vibration insulation.

Also on the goody list: a new coil, plugs, plug wires, moroso advance curve kit.

For carburetion, I ordered a fuel pressure regulator, a bracket for it (a small luxury item), and a calibration kit.

I ordered a piston stop. As I am going to have all the plugs out anyway and I am going to invest and upgrade the ignition, it makes sense to be triple sure that TDC + pointer are 100% spot on.

Timing tape.

And finally, after much debate, a new intake manifold. I really want my heater hose functional. I hate the fact that it is hanging and plugged. That seems half-assed.

Stewart thermostat with flange predrilled and, if it fails, it fails open. Expensive but, I think worth it.

Finally, an insulating gasket for the carburetor.

Ouch !!!

Anyway, I am selling off some of my parts here and there to offset the cost (and buyer's remorse). I should be able to offset most of the expense if not all and then some. I have been meaning to flog quite a bit of equipment over the years but never got around to it. It is about time that I do the responsible thing.
 
Dont drive real far from home.
Be walking eventual.
No Corvette was ever built from the Factory with MSD.
No Trans Am ever either.
 
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