Quote:
Originally Posted by mooney058
I am puzzled - why would stable RPM be a problem - I do not see a reason for that - why would a piston need to move inside the cylinder at varying speeds - it is still 'traveling' all the same way but the only difference rpm makes is 'intensity' ... or is linked to other parts of the engine?
r
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Correct as stated but don't forget the rings are "floating", mating angle with the cylinder and travel distance would vary (even it is extremely small) due to piston travel speed(momentum) and load.
Same would be for all bearings and other mating surface.
All these would be less of a problem these days because the close tolerance achieved by modern manufacturing techniques and knowhows.