Safety Officer Posted March 1, 2012 Report Share Posted March 1, 2012 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 Link to comment Share on other sites More sharing options...
S3flyer Posted March 1, 2012 Report Share Posted March 1, 2012 WOW! Out or curiosity -- you're talking CHT of 275? Which means oil could have been pushing 300? Link to comment Share on other sites More sharing options...
Jim Posted March 1, 2012 Report Share Posted March 1, 2012 "Safety Officer", It would be more helpful to tell us what actually happened to that engine. Could you do that, please? Link to comment Share on other sites More sharing options...
Safety Officer Posted March 2, 2012 Author Report Share Posted March 2, 2012 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. Link to comment Share on other sites More sharing options...
Jim Posted March 2, 2012 Report Share Posted March 2, 2012 11 hours. I'd put money on it being something besides old fuel or wrong octane. More likely an intake manifold air leak. Link to comment Share on other sites More sharing options...
Safety Officer Posted March 2, 2012 Author Report Share Posted March 2, 2012 The plane sat for a long time and was sold to this person. There could be several reasons for the detonation. Without more info we'll never know. Link to comment Share on other sites More sharing options...
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