The Fastest 928 of all time, blows an Engine!
04-03-2013, 10:41 PM
#181
Rennlist Member
That is what Jim is saying. Only if the release bearing was mounted directly to the crank (or flywheel) would it not have the crank put pressure on the thrust bearing during clutch release, and I don't know if a setup such as that is possible. Since the pressure plate is bolted to the flywheel, which is bolted to the crank, bolting the release bearing anywhere else will squash the crank and thrust bearing together.
It's possible that the pressure required to release the clutch on this modified setup may have been too much for the thrust bearing and block in a racing environment.
Dan
'91 928GT S/C
475hp/460lb.ft
It's possible that the pressure required to release the clutch on this modified setup may have been too much for the thrust bearing and block in a racing environment.
Dan
'91 928GT S/C
475hp/460lb.ftI can imagine that a particularly stiff pressure-plate would put enough load on the thrust bearing to cause problems, and I have a vague recollection of that happening in the past. But I have no idea what the numbers might be.
Cheers, Jim
04-04-2013, 03:12 AM
#182
Former Sponsor
That is what Jim is saying. Only if the release bearing was mounted directly to the crank (or flywheel) would it not have the crank put pressure on the thrust bearing during clutch release, and I don't know if a setup such as that is possible. Since the pressure plate is bolted to the flywheel, which is bolted to the crank, bolting the release bearing anywhere else will squash the crank and thrust bearing together.
It's possible that the pressure required to release the clutch on this modified setup may have been too much for the thrust bearing and block in a racing environment.
Dan
'91 928GT S/C 475hp/460lb.ft
It's possible that the pressure required to release the clutch on this modified setup may have been too much for the thrust bearing and block in a racing environment.
Dan
'91 928GT S/C
475hp/460lb.ftThere was very, very little wear on the thrust surfaces....doubtful the clutch had anything to do with this particular "part" of the failure, in this engine.
Both this clutch and my dual disc carbon-carbon street/track set-up are "push" clutches. Both this clutch and my carbon-carbon clutch have a Tilton hydraulic T/O bearing. The stock T/O arm and pivot ball, which allows the stock clutch to be a "pull" clutch, are not present here, or with my custom clutches.
