Posted by MarkB_MI on December 11, 2014 at 17:45:00 from (70.194.14.144):
In Reply to: 13,500 RPM Redline posted by Glenn F. on December 11, 2014 at 15:16:31:
RPMs can be deceiving in reciprocating engines. After all, 10,000 rpm is no big deal in a turbine engine, so why should it matter how fast your crankshaft is spinning? You could probably spin that crank at 100,000 rpm if you removed the pistons and connecting rods from the engine.
What you really should be looking at is piston velocity. An engine with a 6 inch stroke spinning at 3000 rpm has the same peak piston velocity as an engine with a 3 inch stroke turning 6000 rpm. If you compare piston velocities between your motorcycle and tractor, you may be surprised to find they're not that far apart.
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