Ooookkk. I don't know where rotary engines come into play. Even radial engines (which I plan to incorporate into a Tim-Taylor-would-be-proud blender some day) would be new in this thread.
If you are talking about normal everyday car and motorcycle engines, that you have to worry about preiginition, valve springs, airflow, and all sorts of other things that limit RPM. The drive-shaft has nothing to do with RPM limits since it is located after the gears in the transmission.
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