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Old 07-12-2010, 08:46 PM
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There is more to airflow than just quantity.

A high RPM engine will often "like" a bigger carb than the formulas call for, because it delivers a better quality of air/fuel than a small carb will.

If the flow is TOO fast through the venturi, the carb will go pig-rich and the a/f mixture will be bounced off of the plenum floor, etc. This causes all sorts of distribution and a/f separation issues.
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