This is not a rehash of the old outdated port time*area formulas but rather it relies on the true blowdown time (the time it takes for the exhaust pulse to go to zero pressure).Ĭalculate the best pilot jet, slide cutaway, needle, needle jet, and main jet for perfect air/fuel ratio thru the whole throttle opening range.Ĭalculate the exact piston/head clearance at the squish band needed for the right squish velocity for max power.Ĭalculate the right size and placement of counter-balance holes in the crank wheels for less vibration. ![]() This is a complex return wave simulator that allows you to analyze an existing pipe or design your own for the desired powerband and top RPM.Ĭalculate the needed exhaust and transfer port durations to match the desired peak power RPM. Best go to their web pages and see customer reviews there. I can't review these because I think they are all the best because I made them and I'm a perfectionist.
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