Noun
preignition (plural preignitions)
(automotive) The premature detonation of a fuel charge in Four-stroke cycle engines.
Aerosol of particles beyond visible size is an early indicator of materials in a preignition stage of a fire. Source: Internet
Because diesels do not have fuel in the cylinder before combustion is initiated, more than one bar (100 kPa) of air can be loaded in the cylinder without preignition. Source: Internet
Fuel economy and emissions The shape of the Wankel combustion chamber is more resistant to preignition operating on lower- octane rating gasoline than a comparable piston engine. Source: Internet