Quote:
Originally Posted by diehardbiker
Depending, usually 8k RPM is breaking point for valves, Valves can't open and closes 8,000 times per minutes, at this point when valve wasn't properly open and close, it will lock in and because of too much power in it, can snap the piston arm.
On other hand, you mention motorcycle going 15K RPM, that is ONLY if it is 2 stroke engine. 2 stroke engines don't have valves in it, that is why it can go faster and not breaking anything.
It is all about valves when it comes to RPM limitation.
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Aren't there 4 cylinder watercooled 4 cycle motorcycle engines that can do 12,000-13,000 rpm? Valves can go higher than 8k rpm depending on the design of the valve train.
The point, I'm not talking about the valves or the pistons. I'm talking about the combustion. How fast fuel burns off to the next combustion cycle....that's all there is. I think higher revving engines use special fuel that burns faster than unleaded gasoline.