Does anyone have any recommendation as to what is the best carburetors to use when running a four Deuce setup? I have a set of rebuilt Holley 94s but my cylinders are filling up with a lot of fuel. I've had the carbs off and pressure tested four times and they hold I have good compression so I'm at a loss as to what's going on. Thanks for any help or information.
My guess is the fuel is leaking down after you've shut the engine off. Even good carbs can leak down once engines are shut down, and the constant pressure tries to bleed down. I'd suggest going lower than normal pressure to avoid this leak down. Down around 3.5-4.0 psi might alleviate the issue.
Its even worse now that our fuel is full of alcohol. The fuel boils in the float bowl. One thing I have done in the past is lower the floats a little bit. With multiple carbs starving is seldom a problem unless you are running mill that is built to handle all fuel. This helps with the fuel overflowing when hot.
I've read a few posts where the authors have added a bypass with a small orifice between the pump and carbs to bleed off h once the engine is shut off. This thread concerned 97's; but the same principle could apply to your 94's https://www.jalopyjournal.com/forum/threads/dripping-stromberg-97s-after-motor-shutdown.1013921/
I haven't even been able to run this car long enough to do a lot of checking it runs a few minutes and then just fills up with fuel and shuts down and is incredibly hard or impossible to start after that. I'm running the stock model a fuel tank I do have a pressure regulator on there but I can't get it dialed down below 5 lb or so. Years ago I had a three Deuce set up on a similar engine in another Model A with Rochester carbs and never had a bit of trouble
I have a new Holly fuel pressure regulator on the car but can't seem to dial it down below five or six pounds, not sure if I have a bad regulator or not. I also want to add when I crank the engine over I removed the spark plugs and several ounces of raw fuel poured out of a couple of the cylinders but yet when I check the carbs the floats are not sticking and when I put pressure on the carbs the needle and seat are holding.
Remember this, any gauge is most accurate in the center of its range. So zero to ten then most accurate at five. 5 or 6 pounds is a little high for those carbs. Where your gauge and regulator is placed in the river is pretty important, you want the gauge as close to the carbs as possible and your regulator as close to the gauge as possible. You may want to bite the bullet and get a return regulator, that is one with a return line to the tank. A lot of that depends on your pump. Some pumps require a return line to the tank.
They make a completely different, but similar looking, pressure regulator for the low low pressure you need.
Stop what your doing, An change the oil !!! Then Carry-On, Any time you flood out an engine to this degree, the crankcase is full of fuel! The stock A tank has a shut off for a reason, gravity is the factor here.
You're right, and I do not have a shut-off valve right now so I'm going to install one on the a tank like it used to have. Is it possible regulator? I bought it new it is a holly low pressure with a clay Smith gauge
I bought a holly low pressure regulator with a clay Smith gauge that screws right into the regulator it is mounted on the firewall very near the carbs. I'm using the stock model a tank but I did not install a shut-off valve for the fuel I think that's one mistake I made there
Either way, just read you have the reg. On the firewall, as mentioned 3-4 psi , an a shut off, you'll be fine
Stock GM mechanical pump I've replaced it several times just to be sure that wasn't the problem. I can't get the fuel pressure below 6 lb and I believe I should be about a pound and a half to 2 lb. Wondering if I got a bad pressure regulator even though it's brand new I can't seem to dial it down below 6 lb
They make two different I believe, need the other... If I remember rite, I stripped the blue paint off mine, An it's set at 4psi. For two Carter's...
Well that pressure will NOT work ! Try running just the gravity feed to the carbs . By pass the fuel pump .
I bought the low pressure one from Holly it adjust from 0 to 4 or 5 lb I believe but when I crank the engine over it goes up to about 6 lb or so no matter how much I adjust the regulator that's why I'm wondering if I got a bad one
Shit happens.... You get it regulated down, Put a shut off in ... Don't forget to use it!! Or change the oil every time... You'll be fine!
@straycat60 ……I see you are in Maryland. You might try getting in touch with J.B’s Machine Shop in Middle River. The owner and his son are both 94 and Stromberg gurus. Good to deal with.
Thanks, I'll try that. I didn't think just the gravity feed would be enough to supply those carbs, but I'll find out.
They are about 25 to 30 minutes away from me so not too far. I've used them from time to time with great results on machine work. Had no clue that they knew their stuff about carbs as well I will get in touch with them if I can't figure this out. Thanks
It’ll work for static testing and setting the timing and adjustment. It will Probably starve out at wide open .
Is a great looking setup. What carbs are those? Also where did you get your linkage? I got mine from Charlie price at vintage speed.
the carbs are Stromberg 97’s. The linkage was on the unit when I got it from Mark Moriarity. I think he said he made the black part of the linkage quite a while ago
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