engine knock

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Running rings around opponents up to where we suffered an engine knock and the Mighty Gor Mahia got knocked off the continental competition was no mean achievement by any standards.
In a situation where the injectors do not get enough supplies, it could cause engine knock. Replace it with a new filter to keep the fuel flowing into the engine efficiently.
The quality of the fuel in regard to preventing engine knock is measured by the octane value or RON of the fuel.
However, a new devastating knock named superknock, which is much different from traditional gasoline engine knock combustion and whose instantaneous in-cylinder pressure can reach above 200 bars, has become a main obstacle for increasing GDI engine power density.
The influence of environmental temperature on self-ignition is evidenced in Figure 6, where upon increasing environmental temperature, the ignition point temperature increases, hence, if the fuel self-ignition temperature is reached, the engine knock phenomenon appears.
Higher octane ratings in fuel are important for high performance engines to minimize engine knock. Renewable hydrocarbons like isooctene can directly replace petroleum-based hydrocarbons without any compromise of performance.
Ricardo's mix of practical expertise and acute experimental observation gave him a formidable knowledge of subjects such as engine knock and pre-ignition, about which most others knew little at that time.
"We asked automotive firms what their toughest challenges were in measurement and they said that detecting engine knock was the hardest," Downes says.

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