Hi Paul,

I've finished my  (13mm) thick butterfly throttles and I'm trying to decide if an
over the top variable induction pipe (runner) system will have any merit.
Near sealevel yes,  but what about up high?

Does air pressure within the airbox affect the optimum length?

Doug in Japan


Frequency = speed-of-sound/wavelength

An alteration in either speed or wavelength will result in an alteration of the natural frequency.

You can calculate it from this chart.

Why 13 MM ?

Paul Lamar



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