Considering the skinny tires you have to put on the back of that 66, you don’t need much clutch clamping force.

Maybe, maybe not.  Its possible that's supposed to happen.  Friction is a funny thing.  Think about a dragstrip.  Why is the traction good there and not on the street?  Because the street doesn't have rubber cooked into the surface.  The best traction is rubber on rubber.  Possibly that's the case here as well. 

I read an article by a brake mfg. guy a few months ago about "warped rotors".  He claims that the real problem with pulsating brakes is not from warping the rotors but from the pads leaving an uneven coating of friction material when hot brakes are stopped and the clamping pressure is not released...as in coming down a steep hill and then stopping at the bottom and holding one's foot on the brake.  I would suspect that the same theory could be applied to clutches after heating things up real good doing multiple burn-outs.

BB

Last edited by Bullet Bob (3/22/2018 6:42 AM)

Bullet Bob wrote:

I read an article by a brake mfg. guy a few months ago about "warped rotors".  He claims that the real problem with pulsating brakes is not from warping the rotors but from the pads leaving an uneven coating of friction material when hot brakes are stopped and the clamping pressure is not released...as in coming down a steep hill and then stopping at the bottom and holding one's foot on the brake.  I would suspect that the same theory could be applied to clutches after heating things up real good doing multiple burn-outs.

BB

Yeah, I read that article too, but I called BS about immediately.  If rotors don't warp then why does a brake lathe take material only off a high spot when you turn them?  If you've ever turned a set of warped rotors you start skimming the rotor and the cutter only removed material from on particular area at first.  On successive passes it takes material off a larger and larger area as you gradually true the surface to be parallel to the hub mounting flange or perpendicular to the spindle bore.  Rotors absolutely warp, and its by no means as uncommon as that guy claims. 

Now, that's not to say that there's no merit to what he's saying, because I've fixed brake squeal on numerous vehicles by taking a gasket removing pad on an air angle grinder to the rotor surfaces and removing whatever glaze or cooked on crap was on the surfaces, followed by running the pads across some 100 grit sandpaper on a flat metal plate to deglaze them.  I think this occurs when the pads are overheated and the resin that binds the pad material together cooks out a little bit.  It doesn't seem to cause pad failure, just an annoying noise.