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Originally Posted by Sweet72
Detonation is heard when the fuel is igniting too soon on the compression stroke and is more of a engine knocking sound like marbles rattling around on top of the pistons under hard acceleration. Sometimes caused by fuel with too low of an octane rating for the compression ratio of the engine, and may also be caused by ignition timing set too far advanced or carbon buildup in the chambers or pistons glowing and causing the fuel to ignite prematurely.
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That would actually be pre-ignition... the act of detonation before the plug lights the mixture.
Detonation is actually the ignition of the air and fuel in a
controlled environment IE, correct conditions.
U-joints wouldn't make that kind of a noise, although, the carrier bearing could.