Help identifying losing power at autocross only. Video inside

Discussion in 'Track Day, Solo, AutoX & Sanctioned Road Racing' started by zaidtoronto, May 20, 2016.

  1. zaidtoronto

    zaidtoronto New Member

    12
    0
    Oct 26, 2014
    toronto, on
    I took this car many times autocross with no problems. Its a holley carburetor small block chevy. The carb was running rough specially in the morning and it stumble when I give it gas. Took it for rebuild. Now runs great no matter how hard I drive the car in the city...it run good. Last week took it to the autocross and the car kept losing power. At first I thought its the distributor or something to do with the engine. But the after few laps it keep lose power at the same exact spots every time. So i'm thinking its the carb. The level in it just above the eye thing. And its tuned properly. Any ideas? Maybe need better jets?
    You can hear when car losing power:

    https://m.youtube.com/watch?v=TnlA_oCJffc
     
  2. muscl car

    muscl car Veteran Member Lifetime Gold Member

    Floats set to high causing fuel to come out the vent tubes which causes the motor to stumble . Either lower the float level or place a vacuum hose over both vent tubes and cut an opening in the hose in the center of it
     
  3. Randy 81

    Randy 81 Veteran Member

    868
    4
    Oct 28, 2009
    Loganville, Ga
  4. lumpy12

    lumpy12 Veteran Member Lifetime Gold Member

    727
    14
    Sep 16, 2012
    NorCal
    I'm kind of leaning more towards fuel supply to the carb like the pump isn't keeping up or the tank pickup is sucking air
     

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