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Originally Posted by slowbird
Why? Maybe im wrong but i dont believe that.
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If we make the whole car lighter, we can accelerate faster with the same motor - why wouldn't this hold true of the Pistons accelerating the crank?
On the other side, the heavier mass isn't going to want to stop spinning. It's like a large grinder in a shop - shut ia 2" X 10" off, and it's going to spin and spin. If you take that same grinder and throw some 1/2 X 6" wheels on it, it's going to stop considerably quicker.
It's not so much the overall weight, but more so the moment of inertia. The weight at the outside is going much faster, and there for has much more energy. This is why you see clutch combos using several small discs as opposed one large one, this way they can cut the outside weight off the flywheel and reduce its moment of inertia and have it less resistant to changes in speed.