Light weight flywheel - good idea?

[Cobra 29]

DavidNJ, I am not sure I understand your reply. I am planning on installing a standard diameter clutch and flywheel but as I understand the replacement flywheel could be 15 lbs in weight versus the 40? lbs of stock or steel billet (one that I am using now) flywheel.

[speed220mph]

Cobra 29
The rule on flywheel weight is as you go bigger with the engine, lighter with the car and higher on the gear ratio, you can go lighter with the flywheel. All of these factors say to go with a lighter flywheel. It's all about inertia.

[scottj]

Cobra 29,

As you have said, the aluminum flywheel, though lighter, still retains the stock diameter so the effect will not be that noticable. Where as the low moment of inertia units, as DavidNJ has said, are much smaller in diameter. These units have very noticable effects due to the much lower polar moment of inertia. I've run an aluminum flywheel on the street and found no drivability issues at all. I now run a 7-1/4" low MOI unit and can't say the same anymore.
Scott

[scottj]

Quoting myself from the 7th post on this thread...

Originally Posted by scottj

...the aluminum flywheel, though lighter, still retains the stock diameter so the effect will not be that noticable...I've run an aluminum flywheel on the street and found no drivability issues at all.

and no, I wouldn't say that it gave much quicker revs.

Scott