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V-Stacks
As the theory goes, velocity stacks are designed to "smooth" the air entering the carb (read greater volume/speed throughput). If the air is forced to enter over a 90 degee edge, the air becomes turblent in the venturi. Many hours are spent on race carbs to roll edges, etc.., to provide for smooth air entry to the venturi (where stacks are not allowed or can't be easily fitted).
The "tuning" is by length and the radius applied to the upper "lip" of the bell.
High performance airfilters try to provide some measure of smoothing.
Max airflow=greater volumetric effeciency=more power.
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