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Old 11-01-2009, 02:02 PM
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Gunner Gunner is offline
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Join Date: Sep 2009
Location: Sacramento, CA
Cobra Make, Engine: ERA 707, 446ci FE
Posts: 1,115
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Default Accelerator pump tuning

I've got this Speed Demon 750 pretty well dialed in - I will be taking it for dyno tuning in the spring, probably, but I'd like to get it tuned as best I can until then.

Everything is good except that it still bogs a little off the line, a problem the previous owner reported with the Holley 4160 as well.

Given that it seems to be running very well once off idle - I can get solid acceleration at any speed, no detonation and the plugs are clean - I think it's time to tweak the accelerator pump. It has the standard 30cc pump, pink cam and .031 squirters. Where to start? Is this engine likely to need the bigger 50cc pump? (Seems unlikely given that it's relatively mild... but at 446ci it's at the upper end of cubes for this size carb.)

More aggressive cam profile? Bigger squirters? Both? Neither? What's worked for you?
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Last edited by Gunner; 11-01-2009 at 02:15 PM.. Reason: wrong cam color stated
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