Published on Petroleum Equipment Institute (https://testing.pei.org)

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Knock [1]

A condition that occurs in an automotive engine when, instead of smooth burning, there is early ignition of fuel gasses before the piston reaches the top of its stroke.

Source URL (modified on 10/21/2014): https://testing.pei.org/wiki/knock

Links
[1] https://testing.pei.org/wiki/knock