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optimum scavenging at 300 fps ?
cylinder displacement and engine RPM are the two parameters that most affect which pipe diameter to use to achieve the desired mass slug velocity of 300 fps (at HP RPM).
ok
so why then the magic 300fps -could be at lower rpm for efficiency or higher rpm for power
either way ----
does that somehow add or subtract from the
sound waveforms at 1700 fps ?
it can not be the same for an 8 cylinder engine with an optimum of 8 pulses in 720 degrees 90 degrees apart
with exhaust valve open times overlaying them selves even if completely separate dual exhaust s are used
as for a 3 cylinder with 3 pulses in 720 degrees 240 degrees apart
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