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lucittm lucittm is offline
Manassas, VA
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Join Date: Apr 2007
Posts: 1,211
Is there a rev limiter on that engine? If the answer is no (or it is set too high), then you know what happened. Your well-intentioned friend either missed a shift (it happens when you change cars for a few minutes) or he just let the revs go past the safe point (possibly his car has a rev-limiter and he is used to it) and the valves floated for a moment; that's all it takes in an engine like that.

In any case, I would verify with JB Racing that the valve springs used in that engine were each tested and found to be up to the task at any RPM that could be expected (or unexpected). There is no indication of detonation in that engine in my opinion regardless of the fuel mixture or the ignition timing used (you said it was running well, things like that don't typically change suddenly).

1991 964 Polar Silver Metallic Turbo Coupe
Old 10-08-2011, 06:43 PM
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