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Thread: IDLE ADJUSTMENT

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496

    IDLE ADJUSTMENT

    How would adjust the idle on my carb with a adjust screw on the primaries and a screw on the secondary?If it is not adjust correctly would the affect the launch of my car?im footbraking.

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    idle

    OK, since no one jumped in, I will try.

    I am assuimimg Holley carb, but about the same for any carb really.

    You turn each screw in and out until you get the highest vacuum reading or the highest rpm.

    If the idle gets too high, just back off your main idle screw and continue.

    I like to use a vac gage since I have a big one and it is easy to see changes.

    If you can turn in the screws all the way and it makes no difference or is highest reading with screw all the way in, the idle curcuit is not working and is trying to ruin on the main curcuit.

    The throttle blades could be too far open and the idle slot is too far exposed.

    As far as idle being off affecting full throttle performance, it would have a minor effect at best.

    Now maytbe someone will ad some good advise.

  3. #3
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    496
    I THINK I MIGHT HAVE SOLVED MY PROBLEM I PUT A 1050 ON MY CAR LAST NIGHT PICKED UP 2 MPH AND 2/10'S.NOW SHOULD I BUY A 2 CIRCUIT OR A 3 CIRCUIT 1050 I DRAG RACE THIS CAR ONLY THE BORROWED CARB WAS A 9357 1050.

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    May 2003
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    Coldwater, MI
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    2,998
    Quote Originally Posted by JEFF69Z28
    I THINK I MIGHT HAVE SOLVED MY PROBLEM I PUT A 1050 ON MY CAR LAST NIGHT PICKED UP 2 MPH AND 2/10'S.NOW SHOULD I BUY A 2 CIRCUIT OR A 3 CIRCUIT 1050 I DRAG RACE THIS CAR ONLY THE BORROWED CARB WAS A 9357 1050.
    www.apdracing.com

    pickup some more et
    David Lanning
    IHRA NHRA 387B

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


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