OK. If there is more torque with a heavier flywheel, what happens in an extreme case. How come if I attach a heavy enough flywheel it won't turn at all?
Is it because there is not enough torque to overcome inertia?
You obviously have more knowledge on this subject than I do, but I do know that if I make my flywheel heavier, I have less of the engines power available to move my car.
AI: I agree with one of the important points you are making. Too much power to the ground is not a good thing if all that happens is the tires spin.
I guess what I will say is this: The engine produces a finite amount of power/energy. That energy has to turn the flywheel, clutch parts, spur gears, clutchbell, various shafts and parts of the drivetrain in order to make the wheels turn and propel the car. The heavier those parts are the less of that power/energy will be at the rear wheels.