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Thierry25 Thierry25 is offline
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Join Date: Feb 2009
Location: FRANCE (Besanšon)
Posts: 310
Originally Posted by WERK I View Post
Not wishing to stir up a hornet's nest here, but those pistons were doomed to fail. You're right about the top ring land being too close to the valve-cut crown. But, if you look at the area where the fracture occurred, there is very little material at the outer edge of the valve cut to the interior section of the ring land, maybe several millimeter's? Once that cracked started, the area would start to lift........BANG! Valve contact., catastrophic failure.

With all due respect to JB Racing, that was NOT caused by detonation. That is a piston design flaw.

Totle, I know you're not trying to place blame, but illustrate an engine failure. I respect that, just thought you should know a more likely scenario.

I am also agree. This is possible scenario either !

The piston builder should make a wider radius transition to avoid weakness in this area. (From picture ,I am even not sure there is a small radius )
965 C2T / 1991 3.3 TURBO
Old 10-09-2011, 01:24 PM
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