996 Clutch or Pressure Plate failures - Anyone ?
02-20-2010, 03:20 PM
#16
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Oh, right. He'd be pretty upset after all of the work he's done on it.
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Larry Herman
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Larry Herman
2016 Ford Transit Connect Titanium LWB
2018 Tesla Model 3 - Electricity can be fun!
Retired Club Racer & National PCA Instructor
Past Flames:
1994 RS America Club Racer
2004 GT3 Track Car
1984 911 Carrera Club Racer
1974 914/4 2.0 Track Car
CLICK HERE to see some of my ancient racing videos.
02-20-2010, 06:07 PM
#18
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What happens is the pressure ring which is the steel component the straps index moves off center due to either mechanical backhole or excessive RPM, usually a hell of a vibration occurs at the same time, next the straps break and the buzz saw occurs. The early Cup cars came equiped with the Sachs street strap set up of only 2 bands and they were a big problem, once at a cup car race I saw a team go through 3 pressure plates in one weekend event. You must use 3 straps even on the push type diaphragm set ups.
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02-22-2010, 11:24 AM
#22
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02-22-2010, 11:29 AM
#23
Race Car
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What happens is the pressure ring which is the steel component the straps index moves off center due to either mechanical backhole or excessive RPM, usually a hell of a vibration occurs at the same time, next the straps break and the buzz saw occurs. The early Cup cars came equiped with the Sachs street strap set up of only 2 bands and they were a big problem, once at a cup car race I saw a team go through 3 pressure plates in one weekend event. You must use 3 straps even on the push type diaphragm set ups. Any hot rod clutch shop can change them for you. Sachs also has the correct Pressure Plate you just have to make sure they give it to you.
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regards
02-22-2010, 11:34 AM
#25
Race Car
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I am not entirely sure what parts were in there when the failure occurred but I sold the car with a Cup diff, lightweight flywheel, and race clutch just as you describe.
I guess that the pressure plate explodes when it gets torqued strongly in 'wrong' direction (ie wheels driving engine) even if the engine is not overreved.
These cars just don't seem to be as tough as the older Porsches and GT3s are. It is really to bad, since they are cheap and plentiful, and the chassis is pretty damn nice.
Chris Cervelli
Spline Technologies
I guess that the pressure plate explodes when it gets torqued strongly in 'wrong' direction (ie wheels driving engine) even if the engine is not overreved.
These cars just don't seem to be as tough as the older Porsches and GT3s are. It is really to bad, since they are cheap and plentiful, and the chassis is pretty damn nice.
Chris Cervelli
Spline Technologies
By comparison, look at the thickness and size of the drive straps and rivets on a 993 or even 3.2 911 Pressure Plate, they look about 30% thicker/larger/stronger.
02-22-2010, 11:39 AM
#26
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02-22-2010, 06:09 PM
#27
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Dunno the exact makeup of the Porsche plate, but the BMW's are notorious for snapping those straps. A bunch of racers have used a place called Ft. Wayne Clutch in Indiana. You can get those straps upgraded and it is fairly cheap.
http://www.fortwayneclutch.com/
http://www.fortwayneclutch.com/
03-18-2010, 09:06 PM
#29
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I just had a catastrophic failure of the pressure plate on a replacement Sachs clutch I put in my 328iC last year. It looks like on of the straps failed and the pressure plate shattered tearing a hole in my bell housing. I have seen posts as old as 2007 complaining of this problem and there is a VW technical bulletin out on failure of defective Sachs clutches. Has anybody got any response from Sachs on covering this type of collateral damage caused by their defective strap holding the pressure plate to the cover?.
03-18-2010, 10:05 PM
#30
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I just had a catastrophic failure of the pressure plate on a replacement Sachs clutch I put in my 328iC last year. It looks like on of the straps failed and the pressure plate shattered tearing a hole in my bell housing. I have seen posts as old as 2007 complaining of this problem and there is a VW technical bulletin out on failure of defective Sachs clutches. Has anybody got any response from Sachs on covering this type of collateral damage caused by their defective strap holding the pressure plate to the cover?.
Before you put another in, get the straps reinforced from the place I listed above.