Quote:
Originally Posted by JFP in PA
To answer your question, the early (97-00 and some 01's) carried the dual row bearing, which has demonstrated a 1-2% failure rate. The 01-05's carried the single row, which failed an 8-10% rate. The 06-08 engine's carried the oversized third design, which still failed at 1-2%.
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And those numbers are as of a few years ago and are the accumulated failures over as many as 15 or so years. Think of the worst bearing design as around 1% per car year.
Yes, Porsche stopped using the IMS design in '09.
And those that know most say that using the car regularly and reving it well when warm actually reduce the chances.
Anything mechanical fails eventually for some reason. There are lots of things that could happen to any manufacturers engine. Think of the bell curve of failure probability. Some fail early, some late, some never.