Clutch balance?
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From: Katy, TX
Clutch balance? Anyone have a clutch that wasn't exactly balanced? My SPEC Stage IV is pretty close, I guess, but not as close as I'd like. For the most part, the clutch is smooth enough for street use at low RPM's, but even around 2500 it will vibrate like a ****.. If you disengage and re-engage the clutch quickly, moving the disc a bit and reclamping down under the pressure plate, the vibration characteristics change. There's even a "sweet spot" I can find where it doesn't vibrate much at all. At higher RPM's, the vibrations are really pissing off my knock sensors (+12 deg knock retard), and it doesn't exactly make me happy thinking about how my poor rear main bearing and transmission input shaft bearing are feeling about the whole mess.
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From: Novato, California
I'm no expert but when you tightened down the pressure plate did you cross torque the bolts evenly? Did you look and verify that all the forks were even on the pressure plate after you tightened the pressure plate down? These things are the only thing I can think of.
I installed my Zo6 clutch & never had any vibration, Fred
I installed my Zo6 clutch & never had any vibration, Fred
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Clutch install was done properly, that part I'm 100% certain on ... 
There's no problem with engagement, this thing grabs like a homeless guy to a wine bottle. For an unsprung disc, it engages VERY smooth -- no chatter and very drivable. The only complaint is the disc is out of balance!
There's no problem with engagement, this thing grabs like a homeless guy to a wine bottle. For an unsprung disc, it engages VERY smooth -- no chatter and very drivable. The only complaint is the disc is out of balance! 
It's probably the PP out of balance. Have yet to see a clutch that was balanced properly from the manufacturer. The McLeods are the worst, the Rams are the closest. I think it's worth the effort to take it out and get it balanced by a competent machine shop.
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Brand new roller bearing, and the input shaft is in great shape as well. Once I finish up some other projects around the homestead, I'll likely drop the trans and get it balanced... Guess I shouldn't have made any assumptions to begin with The car is serving daily driver duty right now anyway, so its not too big of a deal.
The car is serving daily driver duty right now anyway, so its not too big of a deal. 
