949 twin replacement discs for older clutches
11-26-2016, 11:20 AM
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949 twin replacement discs for older clutches
Just thought I'd share my experience in case anyone is in the same boat as me. Recently had to change the discs on my clutch that I bought in mid 2012. They lasted about 16K miles and probably 40 autox's. They were organics but organics were not available at the time and there was no firm date on when they would be available so I got the ceramic replacements instead. That's when the issue started.
Thanks to Clifton at Competition Clutch I was able to get the car back on the road. The clutch I have has been updated since I bought it and you simply can't just buy new discs and be done with it. Both floater plates are of different thickness than what I originally had. Originally it was .560" for the pressure plate floater (pressure ring) and .140" for the mid-floater. The new thicknesses are .600" and .180". Additionally, although I haven't yet confirmed it, the pressure plate (clutch cover) is also a different design. However, it all seems to be working now.
So, just to sum up, if you have an older 949 twin disc and you need to replace the discs (whether organic or ceramic) you need to check your floater dimensions. If you have the thinner versions of the floaters, you can get new ones from Comp Clutch (about $250 for both) or have your discs relined for the original disc thickness of .290" like Aidan did.
The change was made about a year ago according to 949 and dimensions taken from a clutch bought from around that time seem to confirm that. There is still some variance in pressure plate pre-load from my clutch to the new clutch but that is likely due to the newer pressure plate design which I still haven't yet confirmed from Comp Clutch. I have .080" of pre-load on my clutch and a new clutch has .122". That's a huge (yuge!) difference but again, there may be differences that would tolerate this. A different pressure plate would easily cause this and would likely be required to release the clutch with that much of a difference in pre-load. By using numbers from the original clutch components, .080" is about right for my clutch.
Thanks to Clifton at Competition Clutch I was able to get the car back on the road. The clutch I have has been updated since I bought it and you simply can't just buy new discs and be done with it. Both floater plates are of different thickness than what I originally had. Originally it was .560" for the pressure plate floater (pressure ring) and .140" for the mid-floater. The new thicknesses are .600" and .180". Additionally, although I haven't yet confirmed it, the pressure plate (clutch cover) is also a different design. However, it all seems to be working now.
So, just to sum up, if you have an older 949 twin disc and you need to replace the discs (whether organic or ceramic) you need to check your floater dimensions. If you have the thinner versions of the floaters, you can get new ones from Comp Clutch (about $250 for both) or have your discs relined for the original disc thickness of .290" like Aidan did.
The change was made about a year ago according to 949 and dimensions taken from a clutch bought from around that time seem to confirm that. There is still some variance in pressure plate pre-load from my clutch to the new clutch but that is likely due to the newer pressure plate design which I still haven't yet confirmed from Comp Clutch. I have .080" of pre-load on my clutch and a new clutch has .122". That's a huge (yuge!) difference but again, there may be differences that would tolerate this. A different pressure plate would easily cause this and would likely be required to release the clutch with that much of a difference in pre-load. By using numbers from the original clutch components, .080" is about right for my clutch.
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