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How do you lighten a flywheel and how beneficial is it for acceleration?
 

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You can't really lighten a flywheel.It needs to be replaced with a lighter material like aluminum with a hardened insert for the clutch disk.The benifit of the lighter flywheel is like lighter wheels,It takes less power to turn them so the revs will get up quicker but the heavier flywheel will hold the rpms longer.
 

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Paul. a heavy Flywheel (40,50lbs) is for a heavy car.. it stores the kinetic energy needed to move a 4500 lbs car, a 20 or 10 lbs flywheel stores very little kinetic energy.. now this is street driven .. in race.. a lighter flywheel is the advantage in faster reaction to throttle position...... the difference would really be seen in a launch situation...

where a 50lbs flywheel you could launch with say 3000 rpm and bite hard.. the 20lbs would need 5500 rpm to achieve the same effective launch with out a major bog out of the hole.. all due to stored kinetic or inertia differinitial..

now the heavier Flywheel would be slower to achieve full rpm where the lighter would achieve it in much quicker time frame.. plus it is all ready in a higher rpm when launch. so its max rpm, assuming a 8000 rpm shift point...in with in 3k rpm where as the heavy flywheel is 5k away...

in shifting... the heavy flywheel will not drop rpm as much as the light.. .....

its a bunch of trade offs....

bottom line. like our engine we always claim Combination is the key.. so goes the case of the flywheel, only more so as the whole car must be taken in to account when selecting the flywheel...
 

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