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like you said "But you want to absorb that rebound and take away the oscillations", that is what the others(and you weather you realize it or not) are saying the pulley does. And it DOES do this, absorb the vibrational energy to smooth the engine out. Smooth being the operative word here, not "stop engine destroying harmonics". Again, this is my opinion, maybe I'll go try to dig out my 3000 level MAE Vibrations book and see what I can find. An engine has couterbalance weights to cancel out the large first order harmonics and vibrations. Maybe they do the second order also, I can't quite remember. The damper is to reduce the higher order vibrations that make the car feel "buzzy". Again, this is my opinion, but I feel the fact that after MILLIONS(last time I looked, years agao, thre were 500+ members with pulleys. Say each one only drove 1000 miles with it on, that 500,000 miles right there......) of miles on probably well over 1000+ Z32's in engines of varying shape, mileage and power output, that there is absolutely NO proof to show using an UD pulley damages the engine in any way, I think the pulley is just a "cosmetic" NVH damper.
Mike ------------------------------------------------------
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11:16:38 02/25/03
