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Old 08-18-2002, 04:49 AM
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Question Carb Questions

I have a Holley model # 4160 (03310-2) with mechanical secondaries. I adjusted the linkage so they are now open about 70% at wide open throttle. Before they would only open about 25%. I now have a hesitation more or less thru out any RPM range. Idling speed is 1050 RPM otherwise will stall in drive.
1-how far open should secondaries be at full throttle?
2-why the hesitation and occasional stalling when stomping on it?
3-has anyone used a Holley trick kit, and what were your thoughts?
Thanks for input,

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Old 08-18-2002, 05:14 AM
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The secondaries should open fully, just like the primaries. The hesitation sounds like an accelerator pump problem.
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Old 08-18-2002, 06:47 AM's Avatar Moderator
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You didn't mention how big the carb is, how big your engine is or what you use the engiine for, racing or street. Sounds to me that the carb is too big for your engine, especially on the street. Mechanical secondaries are meant for racing and should never be used on a street engine. If your carb is too big, which they usually are, mechanicals will accentuate the problem. Vacuum secondaries are more forgiving on a too-big-carb since they can be programmed to open only when the engine needs the secondary feed.

I suggest you try your car with the secondaries totally disconnected (be sure to lock the secondary butterflies closed!) I'll bet 4-Jaw's next paycheck that it runs much better on the 2bbl carb than the double pumper 4-bbl. If that's the case, sell the carb you have on eBay and get a properly sized vacuum secondary model.
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