Question

........refers to violent noises, heard
in an engine ,giving a pinging sound
during the process of combustion.​

Answer 1

Knocking, also known as detonation, spark knock, or pinging, in spark ignition internal combustion engines occur when combustion of some of the air and fuel mixture does not create the necessary flame from the spark plug, but instead, one or more of these air and fuel pockets explodes outside of the normal area of