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General Moto | Off-Topic Posts
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[QUOTE="Reeko, post: 122713, member: 16284"] I am not familiar (yet)with the Honda exhaust valves, but in general there are a couple of parts to the valve system. One attempts to alter the effective compression by altering the exhaust port timing. These valves being closed results in a higher effective compression ratio and exhaust velocities (better bottom end power). The other part attempts to effect the returning exhaust compression wave by opening what I think Eric refers to as a surge chamber (at least for the Kawi Kips system). I think that changing the volume of this chamber is what we are refering to with the larger PV covers. I am probably not describing this correctly though. [/QUOTE]
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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
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