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detonation...need a lesson in basic motor mechanics !


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Guest Anonymous

what exactly is detonation? is this what ppl refer to when they say pinging? am i right in thinking that this is combustion of the air/fuel mixture in the combustion chamber BEFORE the spark from the plug arrives? what exactly does it sound like/do?

cheers knowledgeable ppls

ozgeorge

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Guest Anonymous

Pinging is uneven combustion in the cylinders and occurs after the plug fires. Combustion is occuring at other than TDC. It usually sounds like a light rattling when under load. Detonation is the same. Not sure if "detonation" is considered a misnomer or not.

BTW pinging can occur on the piston upstroke and bust rods/rod caps.

Run-on or "dieseling" is the motor running after you switch off the key.

All of the above can be caused by advanced timing and/or low octane.

There!My typing finger hurts! HTH!

Ray

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