True definition of Knock

[Bruce Plecan]

Totally, self explainatory
Grumpy

> "Knocking occurs when a minute portion of the most volatile component of
> gasoline reaches the cylinder a fraction of a second before the principal
> fuel charge, which is supposed to arrive at the instant the spark plug
> fires.  When the more volatile fuel arrives early, the heat and
compression
> inside the cylinder cause it to ignite before the main charge, which in
turn
> causes the knocking you hear."
>           --Bruce W. Smith, Auto World Weekly (July 18, 2000)


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