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Originally Posted by Stroked & Blown
I would imagine that there would be little to no gains on a HP vs. RPM plot, but RPM vs. Time would likely show some improvements, as the lower mass allows the motor to rev more freely (faster). This would result in a faster vehicle.
Same idea w/ lightweight pulleys.
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On any dyno where the car is accelerating (that is, the engine is not being held at a steady-state RPM and the power measured at discrete points), such as Dynojet or Mustang dynos, any reduction in parasitic inertia will show up as "gains" on the dyno. When the engine is accelerating, it has to accelerate the flywheel as well, and if it now has less inertia, less power is spent accelerating it, and more will appear at the wheels. The gains are highest when engine acceleration is highest. The gains are proportional to the gear ratio squared, so highest gains are in 1st, then 2nd, and diminish heavily in the higher gears. If you're intersted in this you can check out a write-up I wrote here:
http://www.stanford.edu/~mpg/lighten...omponents.html .
Anyway, 7.25 inches sounds WAY small for a clutch! Anybody know the outer diameter of the flywheel offhand? I was just going to run some quick numbers on percentage gains in 1st / 2nd / 3rd / etc for the lightened flywheel.