spark knock
Noun
Meaning
spark knock (countable and uncountable, plural spark knocks)
The sound produced, in an internal combustion engine, by the ignition of the fuel-air mixture before the piston reaches top dead centre.
Noun
spark knock (countable and uncountable, plural spark knocks)
The sound produced, in an internal combustion engine, by the ignition of the fuel-air mixture before the piston reaches top dead centre.