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This is what happens if you use really old fuel or the wrong octane.

This happens when the engine is running too hot, too. This one was 275F. When it's hot reduce throttle and land or you may be buying a new engine or at the least spend $6K+ to get it fixed

912 piston 2.pdf

912 cylinder 1.pdf

912 head.pdf

912 piston 1.pdf

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"Safety Officer",

 

It would be more helpful to tell us what actually happened to that engine. Could you do that, please?

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I did discuss this with this gentleman, but he doesn't exactly know what caused it. I didn't see the plane just the after math in a class. I gave him some things to look for, but he didn't give me enough info to make a determination. The engine had 11 hours on it. He might have saved it with an EGT gauge and when he saw it climb too high could have shut it down. That said sometimes detonation happens before you or the gauges can react.

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11 hours. I'd put money on it being something besides old fuel or wrong octane.

 

More likely an intake manifold air leak.

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