What’s the difference between engine knocking and detonation?

Question

[Wikipedia](https://en.wikipedia.org/wiki/Engine_knocking) isn’t clear, seeming to say they’re synonymous, then later implying they’re not.

What’s the difference, if any, between the two?

In: 3

Answer 1

Engine knock is a mistiming in the sequence. The ignition in the cylinder isn’t properly timed with the top piston position. It causes a knocking sound because now the cylinders are fighting each other.