What is Engine Knocking?

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Engine Knocking:

Knocking (also knock, detonation, spark knock, pinging, or pinking) in spark-ignition burning engines occurs when combustion of a number of the air/fuel mixture within the cylinder doesn’t result from propagation of the flame front ignited by the plug, but one or more pockets of air/fuel mixture explode outside the envelope of the conventional combustion front. The fuel-air charge is supposed to be ignited by the sparking plug only, and at a certain point within the piston’s stroke. Knock occurs when the height of the combustion process now not occurs at the optimum moment for the four-stroke cycle. The wave creates the characteristic metallic “pinging” sound, and cylinder pressure increases dramatically. Effects of engine knocking range from inconsequential to completely destructive.

Knocking mustn’t be confused with pre-ignition—they are two separate events. However, pre-ignition is often followed by knocking.

The phenomenon of detonation was described in November 1914 in an exceeding letter from Lodge Brothers (spark plug manufacturers, and sons of Sir Oliver Lodge) settling a discussion regarding the reason behind “Konking” or “Pinking” in motorcycles. within the letter, they stated that an early ignition can create the gas detonating rather than the standard expansion, and therefore the sound that’s produced by the detonation is that the same as if the metal parts had been tapped with a hammer. it had been further investigated and described by Harry Ricardo during experiments distributed between 1916 and 1919 to get the explanation for failures in aircraft engines.

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