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Message: [QUOTE="squeak12, post: 287711, member: 845"] There is definitely gains to be had by tuning the intake through runner length versus plenum volume, but I don't have any clue what the relative gain would be. Also, the tuning will only be applicable to a single RPM value. Yes, you are forcing the air in, but when the valves open, choked flow occurs which will send pressure waves back into the system. Pretty much what Charles mentioned. Tuning this, simply involves manipulating the length of the system to optimize this phenomena at a given RPM. I think it is more of an advantage on non forced induction engines, but I imagine it still helps on forced induction, but as mentioned earlier, I'm not sure of how much. If you are truly interested in reading more do some google searching on helmholtz resonator/resonance and choked flow through valves. [url]http://www.brighthub.com/engineering/mechanical/articles/84316.aspx[/url] [/QUOTE]

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