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Originally Posted by gest24
The lighter clutch will cut down on drivetrain loss/rotational mass. Inturn your engine would have to work less to spin the fltwheel. It can end up in a power increase and you might see a difference at the wheel. Its the same reason we do the crankpulley swap and run synthetic oils. It all cuts down on parasitic drag. Hope that helps a little and I'm sure someone with more know how can add to this.
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The fact that any reciprocating component is lightened, or reduced in mass, can in no way increase actual power. However there will be an increase in acceleration to the point of maximum power.
I contend that any possible reduction in crank pulley weight will have virtually no effect because of the small diameter involved. Fly wheel weight is another story as is reducing pulley diameter and therefore parasitic load.