Stock S2, had a clutch job 2 years ago, and it is strictly a track car. Customer was going down a long straight, shifted from 3rd to 4th, and then there was nothing. Thought you guys might get a chuckle out of it.

 

Defect with the disk or was there another cause? What brand?

 

Wow that's a first...can you say no rev matching?

 

It is a stock sachs updated (spring center from the old rubber ones) disc. He claims that he rev matches on all down shifts. Everything in the driveline appears to move freely and smoothly as well, so that shouldn't have caused anything.

 

Wow.

 

Nice. The metallic version of the disintegrating rubber centered disk.

 

This was an upshift... rev matching isn't really hard, just let the rev drop a bit while you shift, right? Maybe he shifted too fast and the revs couldn't drop. But still, that's just crazy.

 

even if he dumped the clutch from the top of 3rd to 4th the impulse shouldn't have been enough to break the clutch disk, the springs should have compressed, it should have slipped, and the tires should have chirped 1st. Perhapes the installation depth is incorrect (bur on the splines or similar) putting it in a bind in the axial direction which caused fatigue and then failure.

I just installed this same part, and hope the same doesn't happen to me

 

I have never seen clutch break like that.

 

Yeah, that is weird. How many miles on it?

 

It is a track only car, so i would imagine he has about 8-10 events on the disc. The friction material looked nearly new thickness wise.

 

Doc: Who installed the clutch 2 years back? you guys or someone else?

Could be a manufacturing defect from the start, or maybe bad installation (just taking a wild guess here).

 

Cool! So what's it putting out... 500... 600HP?

 

*Cough* Lets just say it was not us, lol. The clutch was installed properly, there really isn't any way you can screw that up, other than leaving bolts loose, of which there were none.

 

Were any of the rivets on the lining missing or sheared when you took it off? Some of those look pretty suspect unless it's just the photo.