Quote:
Originally Posted by glamcem
That's what I thought, how can the lightweight flywheel affect the engine speed when clutch is not engaged ? I always thought it would be the same with lighter clutch..
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The flywheel is on the engine side of things, so even if the clutch is disengaged the flywheel is still spinning. The OEM flywheel is heavy by design. This creates significant inertia once it's spinning, so if you're less than smooth with the clutch it doesn't bog the engine. The downside is that there's more weight to spin and more inertia to overcome when you want to change engine speed. Blipping the throttle on a downshift, say.
A lighter flywheel is better in some ways, as there is less rotational mass and less inertia to overcome when changing engine speed, but at the same time it's less tolerant to marginal shift technique because there is less inertia. Some manufacturers (Exedy, I think) will lighten the flywheel while trying to keep most of the remaining weight around the outside of the wheel. This helps to maintain the spinning inertia, while still removing weight and rotational mass.