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      05-22-2011, 02:14 PM   #27
spdu4ea
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Quote:
Originally Posted by mact3333 View Post
and I bet your dealer also said it happened on DCT cars too......simple, over-rev--->top end failure...rod bearing/oil starvation---> bottom end failures.
Generally true, but not always that simple. Example: take an engine that can handle 9000rpm and stroke it. The top end can still handle 9000rpm, but the bottom end probably won't last, all else being equal.


~10 years ago, over-rev'd stock 993 TT's were as likely to stretch rod bolts (killing bearings) as they were to bend a valve. Today bent valves are more likely, thanks largely to 10 years worth of valve spring fatigue... (NA 993s have higher compression/less valve clearance and almost always kill valves)