Unintended Acceleration - NCRS Discussion Boards

Unintended Acceleration

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  • Stuart F.
    Expired
    • August 31, 1996
    • 4676

    #16
    Re: Unintended Acceleration

    The weighted air valve in the secondaries of an AFB have nothing to do with the secondary throttle valves. In fact, the secondary will work with the air valve removed completely. It is there to prevent a bog down if the secondaries open too fast. On some holley's, the same potential problem is addressed using a secondary acceleration pump (diaphragm).

    Back in the day, I routinely removed the air valves on WCFB Carters and Rochester 4GC's used primarily for racing, specially those on cars with say 4.56 gears which allowed the engines to rev up quickly. Otherwise, it is a fine balance of jetting and positive acting secondary throttle valves. To do it well, you also need to massage the trottle bore transition below the venturis.

    Nuff said. That is not his problem.

    Stu Fox

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    • Duke W.
      Beyond Control Poster
      • December 31, 1992
      • 15633

      #17
      Re: Unintended Acceleration

      Back when I was young and stupid a high school buddy drove his parents '58 Biscayne. We enjoyed flooring the throttle from a dead stop, hearing the "thunk" as the engine flopped over due to the broken motor mount and seeing how long it took to do what he had learned to flip the engine back and unstick the throttle. Wow! How cool!

      His dad probably didn't know about the problem because he never drove it that hard.

      It's a wonder we all lived long enough to collect Social Security!

      Duke

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