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.
Quote:
Originally Posted by sequoias
Heres one thing I've been wondering.....is there a maximum rpm that a combustion can keep up? Like if the engine is running too fast and the combustion of fuel is doing fast as it can. I know that some motorcycle engines can go up to 15,000 or so rpm....I am trying to picture how fast combustion happens in every 4 cycle.
R/C (radio control) 2 cycle nitro fueled engines can go up to 40,000 or so rpm. They are very small, less than 1 cu inches. I think nitro burns faster than unleaded gasoline.
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