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Originally Posted by shiny side up!
Maybe I'm out to lunch, but I thought that F1 had pretty much reached the point that being able to control the movement of the valves was actually what was putting an upper limit on rpm???
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Yea - that's kinda right I think - plus that limit also corresponds with other limitiations like crank vibration, and other factors like internal friction/pumping forces. There is plenty of talk of over 20000rpm and 4 stroke bike engies have gone much higher than that - even with normal valve springs.