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Thread: Holley T Slots

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    Default Holley T Slots

    When blipping the secondary throttle shaft of my four barrel vacuum Holley I can see fuel spraying from the rear transfer slots,but nothing from the primaries when doing the same.....Is this normal????

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    How far is the secondary blade moving when you blip the throttle?

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    Just cracking the blades above idle,can still see most of slot. This is a SA670vac,maybe the air bleeds are too big on the primary side.When lightly raising the rpm with the front blades it stumbles a bit but with the rears its smooth and lively....was thinking lean idle circuit??

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    The secondaries, being vacuum, shouldn't offer any fuel when just blipping at idle?

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    What he is saying is he is blipping the secondary shaft.

    In that case, I suspect fuel flow from the sec T slots would be correct because that is the only airflow into the engine & is at high vacuum which pulls fuel.

    When the carb is in actual operation, the primary throttles are open & high vac is removed from secondary bores.

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    Quote Originally Posted by GtoGeoff View Post
    What he is saying is he is blipping the secondary shaft.

    In that case, I suspect fuel flow from the sec T slots would be correct because that is the only airflow into the engine & is at high vacuum which pulls fuel.

    When the carb is in actual operation, the primary throttles are open & high vac is removed from secondary bores.
    Yep,blipping secondary shaft that little bit....Thanks makes sense.

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