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Thread: SECONDARY LINKAGE SCREW

  1. #1
    Senior Member DYNO OPERATOR
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    SECONDARY LINKAGE SCREW

    THERE IS A ADJUSTMENT SCREW ON THE SECONDARY SIDE OF MY CARB WHAT IS THIS FOR AND HOW DO I KNOW WHEN TO ADJUST IT IF NEEDED?

  2. #2
    Senior Member RACING JUNKIE curtisreed's Avatar
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    Are you talking about the secondary idle adjustment screw? If so it allows you to adjust the idle on a car with low vacuum/big cam, without uncovering too much transfer slot in the primaries.

    Curtis

  3. #3
    Senior Member DYNO OPERATOR
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    INSTEAD OF RAISEING THE IDLE WITH THE PRIMARY ADJUSTMENT SCREW I CAN RAISE IT MORE IF NEEDED WITH THE SECONDARY SCREW.
    900 RPM WITH PRIMARY & 200 MORE WITH SECONDARY.

  4. #4
    Senior Member RACING JUNKIE
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    They are normally adjusted the same, if the primary is in say 4 turns, the secondary is in 4 turns also.
    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
    Senior Member DYNO OPERATOR
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    secondary

    I like to take the primary to a minimum position and then adjust the secondary to get the RPM I want. I think the carb is more responsive off idle that way. Just my opinion.

  6. Racing Junk


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