Derek, interesting! I don't think this is what is going on in the
engine simulator however because there is no way to enter weights of
reciprocating components in this software. The software would have to
assume that there is some relationship between engine displacement and
the equivalent reciprocating masses and that would be a very perilous
thing indeed. Still, I'm sure what you describe must play some role in
the real world.
Frank
> -----Original Message-----
> From: Derek White [mailto:derekw@sltnet.lk]
> Tim is talking about reciprocating weight, not rotating
> weight. It takes a lot of force (and power) to continuously
> accelerate, decelerate, accelerate the rods and pistons.
> Since the acceleration and thus the force is related to the
> stroke x rpm squared, as the rpms go up, the forces go up
> exponentially and there will be a point where the extra power
> used to move the reciprocating masses exceeds the power gain
> from burning air/fuel (which is only increasing linearly and
> is dropping off anyway due to breathing
> limitations.)
> Derek White
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