Quote:
Originally Posted by seank
Also, rod bearings are not damaged by running at 8000 or even 10,000 rpms assuming you have adequate oil pressure at those rpm's. Most race motors have an upgraded oil pump, especially the s54. Upgrading the oil pump can also allow you to run a thinner oil and run cooler than stock and it will increase the power output of the motor to the rear wheels. There are other parts of the motor that won't handle 9000 rpm's well, but I won't get into that here.
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Here are some mean piston speeds that I've found here:
http://www.eng-tips.com/viewthread.cfm?qid=259413
23.4m/sec Honda S2000 84mm stroke @ 8300rpm
24m/sec BMW S54B32 91mm stroke @ 7900rpm
25.1m/sec Formula 1 40mm stroke @ 19000rpm
This gives some idea of the level of performance of the S54 engine.
I've experience catastrophic bearing shell failure in my S54 Z3 M Coupe (redline at 7,600rpm) as in the photo below.
