Do Intermediate plates "wear out"
07-12-2003, 07:03 PM
#1
Rennlist Member
Thread Starter
Do Intermediate plates "wear out"
I remember asking somebody (I think it may have been Jim) about whether an intermediate plate can wear out.
I can either buy a new one, or a used one, and there is a few hundred dollars difference.
I have already read that they can be resurfaced, but that it will reduce the clamping force of the clutch disks.
Any BTDT?
I can either buy a new one, or a used one, and there is a few hundred dollars difference.
I have already read that they can be resurfaced, but that it will reduce the clamping force of the clutch disks.
Any BTDT?
07-12-2003, 08:21 PM
#2
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
No BTDT on the 928 but...
The plate can be resurfaced by any competent machine shop that can do Blanchard grinding. There is a small penalty in thickness, but it doesn't come close to the thickness differences you'll see in clutch plates as they wear. Total stack thicness includes the two clutch disks, the intermediate plate, and the machined surface of the clutch cover.
Consider therefore that buying a resurfaced intermediate plate is no riskier than buying a "rebuilt" clutch cover. Those are typically resurfaced, cleaned, etc, without much else. Some of the better rebuilds include new springs, but most don't.
Maybe the way to sort through the intermediate plates is with a micrometer, with an eye towards total thicness, minus a guesstimate of how much will need to be removed from the faces to get it both smooth and parallel again.
There must be a huge market out there for an aluminum intermediate plate with hard-face metal sprayed friction surfaces. Make it hollow like a front brake disk and force cooling air through it to stave of those twisted stresses, and your car would rev like a sprint car with the in-and-out box disengaged. Ok, maybe a little slower, at least until you had the matching flywheel installed.
Cheers!
The plate can be resurfaced by any competent machine shop that can do Blanchard grinding. There is a small penalty in thickness, but it doesn't come close to the thickness differences you'll see in clutch plates as they wear. Total stack thicness includes the two clutch disks, the intermediate plate, and the machined surface of the clutch cover.
Consider therefore that buying a resurfaced intermediate plate is no riskier than buying a "rebuilt" clutch cover. Those are typically resurfaced, cleaned, etc, without much else. Some of the better rebuilds include new springs, but most don't.
Maybe the way to sort through the intermediate plates is with a micrometer, with an eye towards total thicness, minus a guesstimate of how much will need to be removed from the faces to get it both smooth and parallel again.
There must be a huge market out there for an aluminum intermediate plate with hard-face metal sprayed friction surfaces. Make it hollow like a front brake disk and force cooling air through it to stave of those twisted stresses, and your car would rev like a sprint car with the in-and-out box disengaged. Ok, maybe a little slower, at least until you had the matching flywheel installed.
Cheers!
07-13-2003, 03:05 AM
#3
Rennlist Member
Thread Starter
Thanks bob. Your using some other ideas that I was not ready to read at 11pm, but I will recheck this in the morning and try to add something intelligent.
