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Old 10-22-2004 | 01:22 AM
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XJet
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From: Tokoroa, , NEW ZEALAND
Default Strange engine noise

A friend just fitted a new GMS 76 to his Extra 300 and it makes a very funny noise at full throttle.

It's kind of an irregular metalic hammering sound.

Could this be detonation?

In all other respects the engine runs just fine and has plenty of power, a good idle and great transition.

He's running an 11x8 prop on it.

Ideas anyone?