Hi Paul, for a 13b that is P-ported, up to what RPM can you maintain
100% volumetric efficiency? How about with 10lbs boost?

Dave J.

Try 120% VE. Organ pipe tuning is free supercharging. No intake valves to get in the way.

18 to 20 inches 2 Inch OD tubes gives 6000 to 6500 RPM peak VE and peak Torque.

Paul Lamar


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