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Thread: alky carb problem

  1. #1

    alky carb problem

    I have a problem with my carb.I have a 477 bbc with 13.1 comp,278-286 solid roller with bb2 heads,and a George ruppert 1050 alky dominator,with a magnafuel 500 fuel pump.Car runs 10.0@135
    The carb came with 174 jets.George told me "do not go any bigger than 177.My problem is that my car lays over on top, and after the 1/4 mile and letting off the throttle and crusing to the end the car wants to shut off,i have to pump the throttle alot to get it running againit sounds like the bowls are drained.also, i now have 200 jets in the carb and my egts are 1249, i started at 174s and went up from there.
    Do i need to put the 177 back in with smaller air bleeds?would that get my egts where they should be?

  2. #2
    Senior Member RACING JUNKIE curtisreed's Avatar
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    If you are really having the fuel bowls empty on the top end then I can tell you that bigger jets will just make the problem worse. You need to work on fuel delivery if that really is your problem.

    Curtis

  3. #3
    Senior Member RACING JUNKIE
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    You have to keep fuel to the carb to determine if you have a carb problem. It sounds like a fuel pump/psi issue, not in the carb.

  4. #4
    Senior Member RACING JUNKIE
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    Quote Originally Posted by shawnp
    You have to keep fuel to the carb to determine if you have a carb problem. It sounds like a fuel pump/psi issue, not in the carb.

    x2 ... had same issue back when I first started with alky .. upgraded my fuel pump and problem gone
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  5. #5
    my pump is a brand new magnafuel 500.i just checked flow, i pulled lines off carb and put them in a 5gal can;the pump filled 5gal can in 51 seconds.i have plenty of vol and pressure.at the end of my runs the gage reads 7.5psi.

  6. #6
    Senior Member RACING JUNKIE
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    Quote Originally Posted by bwooten71
    my pump is a brand new magnafuel 500.i just checked flow, i pulled lines off carb and put them in a 5gal can;the pump filled 5gal can in 51 seconds.i have plenty of vol and pressure.at the end of my runs the gage reads 7.5psi.
    What size needle and seat?
    -WJ Birmingham

    OneBadGMC.com

  7. #7
    Senior Member RACING JUNKIE
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    Alky ?

    Sounds to me like you have a AIR Leak>?
    Intake gasket?
    A Hole that the Fuel can keep up with,would also make sence whys it Dies on the Other End,Hard Starting,ETC....?
    Later
    G 8)

  8. #8
    Junior Member APPRENTICE
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    alky carb

    with alky egts should be around 105o to 1150 pressure on alky with rupert carb should be around 10 psi you really need a belt driven pump makes all the differance in the world.

  9. #9
    Senior Member RACING JUNKIE
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    Call down and talk to George or Willie. We run belt drive and we are at 3 at idle and I believe when we did the check fof down track it was around 9. George will tell you where to be with your pump.

  10. #10
    i dont know what size the seats are,im going to pull them out and check them.i went with magnafuel 500 because george said it would be ok.
    thanks for your help guys


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