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Thread: Is it a Carb. Problem??

  1. #1

    Is it a Carb. Problem??

    Ive recently bought a 750 proform race carb for my 89 camaro drag car. After properly setting the float level and idle we have taken it to the track. I've experienced problems with the car "stumbling" or "lagging" off the line. While trying to find the problem with the car today, i noticed the adjustable "airflow" screws on the front bowl or plate were 1 1/2 turns out on both sides, where as the back are only 3/4 of a turn out.
    Im wondering if this may be my problem with my car not wanting to leave the line properly.
    Note: the timing is at 36 degrees

  2. #2
    Senior Member RACING JUNKIE
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    Coldwater, MI
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    Put them both to 1 1/4, but thats not whats doing it.

    Do you have jet extensions ?
    David Lanning
    IHRA NHRA 387B

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

  3. #3
    Yes the back bowl came with bowl extentions

  4. #4
    Quote Originally Posted by hammertime
    Put them both to 1 1/4, but thats not whats doing it.

    Do you have jet extensions ?
    Yes it has bowl extentions but if thats not it, then wat could it be??
    Do u think i may have the bowls set a lil low, causing it to not get the fuel it needs off the line??

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    May 2003
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    Coldwater, MI
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    Quote Originally Posted by MillerTime12
    Quote Originally Posted by hammertime
    Put them both to 1 1/4, but thats not whats doing it.

    Do you have jet extensions ?
    Yes it has bowl extentions but if thats not it, then wat could it be??
    Do u think i may have the bowls set a lil low, causing it to not get the fuel it needs off the line??
    Not bowl extensions, jet extensions would be on the back jets. Have you had the bowls off the carb and looked at the back jets ? If so is there anything else on them or just the jets ?
    David Lanning
    IHRA NHRA 387B

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

  6. #6

    Re: Is it a Carb. Problem??

    Quote Originally Posted by MillerTime12
    Ive recently bought a 750 proform race carb for my 89 camaro drag car. After properly setting the float level and idle we have taken it to the track. I've experienced problems with the car "stumbling" or "lagging" off the line. While trying to find the problem with the car today, i noticed the adjustable "airflow" screws on the front bowl or plate were 1 1/2 turns out on both sides, where as the back are only 3/4 of a turn out.
    Im wondering if this may be my problem with my car not wanting to leave the line properly.
    Note: the timing is at 36 degrees
    I would check the accelertor pumps to see if the pump arm is all the way against the adjuster, if you have any slack it will definetly bog. Also I would check the ignition curve, the car might not have enough inital timing.

    good luck ,
    steve

  7. #7
    haha
    im sorry
    i meant jet extentions
    but yes it does

  8. #8
    Senior Member RACING JUNKIE
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    Dec 2007
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    ohio
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    all good points, i would also look at useing larger shooters.

  9. #9
    Senior Member DYNO OPERATOR
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    Aug 2007
    Location
    Lost Creek, WV
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    533
    Are you foot-braking or using a trans-brake? If you are foot-braking I would look at the accelerator pump circuit. If you are using a trans-brake you might check fuel pressure and or float level.

    TS1955

  10. #10
    Quote Originally Posted by TS1955
    Are you foot-braking or using a trans-brake? If you are foot-braking I would look at the accelerator pump circuit. If you are using a trans-brake you might check fuel pressure and or float level.

    TS1955
    Im foot-braking it. I adjusted the airflow screws and it didnt help much.


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