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Old 07-08-2003, 09:18 PM
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Richard Hudgins Richard Hudgins is offline
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Join Date: Jun 1999
Location: Fallbrook, CA USA, CA
Cobra Make, Engine: Porsche 928 S4
Posts: 739
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rsimoes,

Virtually every sports car (Le Mans type) and formula car up until the last couple of years, have run a light steel flywheel. (The current stuff has no flywheel on the engine, the clutch and reaction plate is carried in the gearbox.)

I have never seen a flywheel failure in any of these cars. 9500 to 13k rpm is normal running range.

On a BB Ford engine, I do not have a clue.

Also, I do not see how a light steel flywheel can allow the engine to vibrate any more than a heavy unit. The heavy flywheel may well change the harmonic frequency a bit, but balance would not change.
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Richard Hudgins
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