spark knock

spark knock

[′spärk ‚näk]
(mechanical engineering)
The knock produced in an internal combustion engine precedes the arrival of the piston at the top dead-center position.
References in periodicals archive ?
When analyzing pre-ignition induced engine knock, strong commonalities can be found to common spark knock in both frequency and intensity.
This result leads to the conclusion that the mega-knock behavior after pre-ignition is very comparable to conventional spark knock in its response to high octane fuels.
Combustion chamber volume decreases from carbonaceous deposits, causing spark knock.