engine knock

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engine knock

[′en·jən ‚näk]
(mechanical engineering)
In spark ignition engines, the sound and other effects associated with ignition and rapid combustion of the last part of the charge to burn, before the flame front reaches it. Also known as combustion knock.
References in periodicals archive ?
When added to gasoline, MTBE enhances octane levels to reduce engine knocking.
8-litre petrol four cylinder engine knocking out 98bhp and an 81bhp electric motor.
Late-cycle direct injection of fuel—a principle fundamental to the Westport[TM] HPDI architecture—is the only combustion approach that eliminates the danger of engine knocking.
5-litre petrol, four cylinder petrol engine knocking out 178bhp coupled to an electric motor, the result is a reasonably swift sports saloon that neatly sneaks into the zero tax threshold because of CO2 emissions of just 99g/km.
The European automotive market continues to cough and chug along, engine knocking, crawling ever more slowly down the highway of poor sales performance and over-capacity.
This enables prevention of engine knocking, a contributing factor to power erosion.
Shift to the highest possible gear without the engine knocking.
With stunning looks, a mighty powerful engine knocking out 162hp and a monster 240 section rear tyre, it will cost pounds 12,995.
The company says the higher the octane number, the less likely the fuel will prematurely ignite due to high pressure in the cylinder, which sometimes causes engine knocking and reduces performance in acceleration.
For decades, auto emissions contained lead because gasoline refiners found it a cheap, simple way to boost the octane of low-grade fuels to prevent engine knocking.
Methyl tert-butyl ether (MTBE), a chemical included in gasoline to prevent engine knocking, has been used to dissolve gallstones in six people at the Mayo Clinic in Rochester, Minn.
Typical gasoline-powered engines run at a compression ratio of 10:1, as they are limited by engine knocking.

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