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Old 09-11-2012, 05:03 AM
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Ludwig II Ludwig II is offline
Motorized Bicycle Elite Member
Join Date: Jul 2012
Location: UK
Posts: 4,302
Default Re: What exactly is Detonation

What happens is that as the flame front spreads out from the plug, it forces unburnt fuel and air mixture ahead of it until it reaches a physical and thermal density sufficient for self ignition to occur, much like a diesel engine; but far too hot for the metal surrounding it. This ends up causing localised melting of the piston and the head, which is why it is sometimes also called pinking in the UK, or knocking. This is the sound of the micro explosions trying to eat your engine.
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