Originally posted by cawong11:

There is no crank harmonic damper on this motor and on the other end of the crank is a Fidanza flywheel. Why are they able to run these race motors at 8500rpm all day long, and all they have is a lightweight underdrive pulley? I have also seen Leo Capaldi's engine up close and personal, and it has a UD pulley too, and is prepped by Kinetics too.

Please explain.



Couple of thoughts..
1) race engines probably running the softer trimetal/Clevite bearings which are more tolerant of crank whip than harder aluminum bearings in regular duratec.

2) If they lightened internals (ie Ti. rods) and blueprint balancing of rotaing mass (with UDP in place) harmonics could be optimized and lessened.

3) race engines do not normally last 100K + miles...stock motor, 100K+ is desireable..

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