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Thread: Strange Holley Carb Problem?

  1. #31
    cfm
    Oh, BTW, engine vacuum does not effect the vacuum secondaries. It works off of airflow. There is a channel in the primary bores, that when airflow going thru primaries gets to certain level, will cause a vaccum in this channel, which is connected to vac secondary mechanism. There is typically a channel like this in the secondary side too, so as airflow gets to a certain point here, it adds to the the vac signal from primaries and pulls secondaries open even further.
    So, yes, it is vacuum operated but not from engine intake manifold vacuum.
    Just wanted to point this out to everyone for it is a very common misconception and is good info for knowing more about how carbs work.

  2. #32
    zgoo
    CFM, Your right about that. After having this problem I did research the vac. sec. circuit. I should have said air flow. She runs great!!!

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