The nearest equivalent speaker enclosure design is a bass reflex but 3 ports in that would sum to 1 not work as 3 different ones as I think they do in an airbox - this video gives an explanation - skip to about 5mins in to see visuals of resonance. 10,600rpm is 265Hz, so the box is experiencing a frequency range similar to a woofer, with three resonant frequencies. The firing order is, I think, every 240 degrees, so induction will be the same, and that's a regularly spaced pulse for a normal sounding 30Hz. For a 4-stroke there's an induction every second revolution so that's 10 inductions per second, and for a triple, that's 30 per second. The lowest idle speed is 1200rpm, so divide by 60 for seconds (so we can get Hz) and that's 20 revolutions of the crank per second. I did some maths on the frequencies - maybe someone can check it for me as my brain is rather old. or even share their experience of changing the airbox. I am trying to understand this very cool airbox - hoping someone will step in and correct me.
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