ORIGINAL: XJet
We've only seen one TT.46Pro bust up an "original" rear bearing and it was doing about 17K RPMs at the time.
Bruce,
I would not consider 17K a real high RPM... The rear 3902 bearing from most manufacturers, is rated at 32K max...
At least three of those I saw here 'blew-up'... Large fragments of the cage got 'caught' between the sleeve and the piston, in a port... One engine broke the crankshaft, the second 'pretzeled' the con-rod and dented the crankcase and the third pushed the head-off, breaking two screws and pulling the threads out with four...
It seems strange so many different forms of failure, can result from a seemingly identical cause...
None could be repaired for a reasonable cost.