2G What causing this uneven clutch wear?

Jacolu3 · May 9, 2017

So this sbc has about 3000 miles on it. After about 300 miles I pulled the tranny and got the flywheel step height checked and it was.610 and I shimmed the ball. My shift fork was slightly favoring the drivers side. I put a new oem master and slave with a ss line straight from the master to slave. I bled the lines then adjusted the clutch pedal per Jacks videos. Then I bled the line again and then confirmed the clutch pedal was adjusted correctly. Put on around 3k miles with no launching and no high Rev shifting and this is how the clutch looks.
What could be causing this?

94awdcoupe · May 9, 2017

light weight fly and no balance shafts can cause this.

kmetiuk · May 9, 2017

94awdcoupe said:
light weight fly and no balance shafts can cause this.

Interesting......how so? Can you elaborate a bit more?

I'm genuinely curious as I have weird clutch PP wear issues that I'm exploring different reasons still.

Archer Fabrications · May 9, 2017

Is it possible any one of the three main clutch parts is warped? Flywheel, disk, or pressure plate?

Jacolu3 · May 9, 2017

Archer Fabrications said:
Is it possible any one of the three main clutch parts is warped? Flywheel, disk, or pressure plate?

Well I know the flywheel is straight because I had it checked. And remember clutch and pp did that since day 1

red_devil · May 9, 2017

How was the clutch behaving before you removed it? I have about 1200 miles on my sbc and im getting vibrations under slow disengagment. First 500 miles it was fine now all of sudden it shakes the whole car.

94awdcoupe · May 9, 2017

kmetiuk said:
Interesting......how so? Can you elaborate a bit more?

I'm genuinely curious as I have weird clutch PP wear issues that I'm exploring different reasons still.

engine harmonics on straight four are worse than any other engine design, when the clutch is disengaged it can absorb the harmonics and vibrate. there is a local here using solid center discs and the friction material is rattling off in 2000 miles. no launches, no heat signs. fiction material is just flying off.

just a theory. kinda hard to prove. but if it did vibrate the outer part of disc would whip back and forth between the fly and PP.

kmetiuk · May 9, 2017

94awdcoupe said:
engine harmonics on straight four are worse than any other engine design, when the clutch is disengaged it can absorb the harmonics and vibrate. there is a local here using solid center discs and the friction material is rattling off in 2000 miles. no launches, no heat signs. fiction material is just flying off.

just a theory. kinda hard to prove. but if it did vibrate the outer part of disc would whip back and forth between the fly and PP.

That totally makes sense. Vib's can do a lotta damage. Thanks for the insight.

Jacolu3 · May 9, 2017

red_devil said:
How was the clutch behaving before you removed it? I have about 1200 miles on my sbc and im getting vibrations under slow disengagment. First 500 miles it was fine now all of sudden it shakes the whole car.

The clutch actually felt fine to me. I only really noticed it while down shifting from 3rd to 2nd. It would lock me out occasionally. But once the clutch would warm up it felt fine.

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2G What causing this uneven clutch wear?

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