09-09-2022, 08:23 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by cobragene
Good point Patrick and that was the case which I corrected about 6 months ago, it was opening 80-85% but not much improvement. I even wired the vac sec closed and not a great deal different, the most I can get them to open is about 85% with the lightest spring. It feels more like a potent small block.
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Just so that I'm clear, and forgetting about your secondaries for the moment, you're positive that your primary butterfly valve is opening 100% when the pedal is pushed all the way to the floor. That's 1/2 of our primary goal, which is to ensure that both the primaries and the secondaries are opening 100% under peak load. With a vacuum secondary carb, the secondaries can not function at their best unless the primaries are opening properly. If you are absolutely sure that the primary side is opening 100% (and the only way you can tell is to remove the air cleaner and look down the top of the primary side of the carb while somebody steps on the gas pedal) then we'll move on to the secondaries. If you can't get the primaries and secondaries to open 100% fully when you're flooring it while going up a hill then there is no point looking elsewhere for the problem until you remedy that one.  |
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