Please note that detonation is a different event than pre-ignition where the mixture is ignited by usually hot spot, glowing carbon deposit or overheated ground spark plug electrode, prior to the mixture ignition by spark form spark plug. The damage to the spark plug is a result of the events and the high frequency shock wave. This event takes place in a split second and cause extreme pressure shock wave, which often pits the piston surface (looks sandblasted as it compresses less dense micro-portions of the aluminum alloy) and almost always breaks ceramic insulator on the spark plug. As the flame front propagate trough the combustion chamber, the pressure and heat on the remaining yet un-burnt mixture increases dramatically pass the point of fuel octane rating and any hot spot (most often hot side of the piston) will detonate (explode) the remaining yet un-burnt mixture. These terms are commonly misunderstood and confused with each other.ĭetonation occurs after normal combustion (controlled burning) was initiated from a spark between spark plug electrodes. The two most destructive combustion events to the engine and the Spark Plug are: PRE-IGNITION and DETONATION. Spark plug is like a dipstick into your engine, which will let you see what is going on inside of the combustion chamber. Excessive formation of combustion depositsĭust penetration into the combustion area
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