A quick overview (and reply by someone from Alfa Romeo) here on Stack Exchange.

https://physics.stackexchange.com/questions/272914/how-does-a-side-branch-intake-resonator-helmholtz-work

I'm sad enough to find this interesting, being that at least a relatively basic understanding [I'm no phD, after all!] of fluid dynamics is useful designing in hydraulics. I'd always been curious about the effects on the NSRs, but I doubt it's something even particularly measurable on the dyno, and we never had time to try it. (One of the few things on the NSR I don't have first hand results/graphs of, unfortunately.)

I am sure there's a reason why Honda moved it to the airbox/behind the carbs on the MC28. Maybe because the shorter carbs dictated it, maybe they found adding several cm to the inlet length worked better given the lower 40HP limit and the rev range the standard bike was predicted to run in. No idea... but I'd really like to know!
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Andy.
NSR-WORLD.COM

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