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Official Curmudgeon
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4,707 Posts
I have my doubts that you will find such a thing. Lighter flywheels are for racing.

A flywheel is an inertia device, meaning that it stores energy. The heavier it is the more energy it stores, the lighter the less. The energy storage makes it harder to accelerate or decelerate the flywheel and anything attached to it. More difficult to accelerate is a bad thing if you are running the quarter mile where you want maximum acceleration.

In a Jeep if you were to lose traction the engine rpm will increase. The heavier flywheel gives you a bit longer to let up on the go pedal before the engine reaches red line. Alternatively, the heavier flywheel makes decelerating more difficult so if you misjudge how much power you need for a particular situation, you will have a bit more time to give the engine a little more gas before it bogs down and stalls.
 
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