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Thread: perplexing problem

  1. #1
    Senior Member DYNO TECH
    Join Date
    Aug 2007
    Location
    Colebrook Connecticut
    Posts
    425

    perplexing problem

    brand new AED 4150 carb
    set floats and pump shot
    initially I had a bog from standing start.
    changed cams and shooters (BIGGER)
    second road test:
    stomped the throttle and spun tires through first into second.

    next day
    warm car up to temp as before.
    step on gas and bog is back???????
    took off pump arms and bent the arms a little.
    readujted accel pump for .015 at WOT.
    ok back to smoking tires!
    next day same ol bog again?
    this got me scratchin my head?????
    maybe bigger accel pumps ????

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    May 2006
    Posts
    2,044
    You can go up to a 50cc pump on the primaries, but you've probably got another issue, are you sure your getting adequet fuel pressure?
    ***IN GOD WE TRUST***

  3. #3
    Senior Member DYNO TECH
    Join Date
    Aug 2007
    Location
    Colebrook Connecticut
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    yes 6.5 psi at idle
    5.5 psi at wide open

  4. #4
    Senior Member RACING JUNKIE
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    May 2003
    Location
    Coldwater, MI
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    2,998
    Quote Originally Posted by rabiddawg
    yes 6.5 psi at idle
    5.5 psi at wide open
    Not enough for me .. increase it a lb
    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 TECH
    Join Date
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    Location
    Colebrook Connecticut
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    425
    ???
    max for a holley is 7 PSI

  6. #6
    Senior Member RACING JUNKIE
    Join Date
    May 2003
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    Coldwater, MI
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    2,998
    Quote Originally Posted by rabiddawg
    ???
    max for a holley is 7 PSI
    A holley carb ?
    David Lanning
    IHRA NHRA 387B

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

  7. #7
    Senior Member RACING JUNKIE
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    Jun 2003
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    Hobbs, NM
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    842
    Lean problem. In the morning air is better bog. Later in the day air is worse no bog. Turn your idle screws out 1/2 turn. May need 50cc pump and/or little bit bigger squirters.

  8. #8
    Senior Member DYNO TECH
    Join Date
    Aug 2007
    Location
    Colebrook Connecticut
    Posts
    425
    hmm plugs are a dark tan and color change is at bend of the ground strap.
    I do get some cutting up ( or muffled popping)on decel but didnt notice any pingng or detonation.
    running leaded 110 sunoco gas
    ill try going up 2 jet sizes and see what happenes

  9. #9
    Senior Member RACING JUNKIE
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    Sep 2007
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    4,143
    I would call AED and ask them...would have thought the thing was closer than that out of the box...as far as the pump cams and squirters I mean.

  10. #10
    Senior Member RACING JUNKIE
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    Dec 2007
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    ohio
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    810
    i woud put a 50cc pump on for sure, if you have another gauge, i would swap the old one out, i have seen gauges that were off as much 1.5 lbs, i would also try a little more pressure, good luck.


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