Knock 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. By rhys|2014-10-21T15:06:09+00:00October 21st, 2014|Comments Off on Knock Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys