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diesel knock in ci engines how to fix engine knock
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#EngineeringHub • Diesel knock is experienced in the diesel engine. When a high-pressure wave strikes the cylinder wall, cylinder head, and piston, it results in diesel knock. • When sudden and violent knock are experienced in a petrol engine, these knocks are termed as “Detonation”. • This engineering term, you might have experienced on your motorbike. • There is power and efficiency loss along with the rough running of an engine is observed. • In severe cases, it may wreck the engine also. • A considerable amount of air-fuel mixture may ignite at the same instant and result in a combustion knock or heavy thud rather than pink. • While it ends mixture which knocks in the spark ignition engine (petrol engine) it may fairly large part or parts of the mixture, which knock in compression ignition engine. • To prevent diesel knock, following important methods can be used very effectively. • 01) Add 1% of ethyl nitrate or any nitrate to accelerate the combustion of fuel. • This process is known as “Doping” and reduce delay period considerably and hence prevent diesel knock. • 02) For spontaneous ignition of the fuel, we require much higher temperature this can be achieved by raising the compression ratio. • The rate of pressure rise increases resulting in the smooth running of the engine. • If compression ratio increased in a petrol engine, the engine is more liable to detonate, but in a diesel engine, it reduces the diesel knock. • 03) Diesel knock can be reduced by increasing the turbulence of the compressed air injected promotes homogeneous mixture by stripping the fuel from the spray. • 04) Arrange the fuel injector in such a way that it should start injecting only a small quantity of fuel in starting of the engine. • If we increase the injection pressure, which encourages the atomization of fuel and prevent knock. • 05) By raising the temperature of the coolant that of the intake air as well as the cylinder head and combustion chamber. • 06) Also by increasing the inlet pressure of air (Supercharging), we can prevent diesel knock. • Now the above description will clear the doubt about diesel knock in your automotive engine. • For more details on diesel knock, visit https://goo.gl/SYKcEa • Get the Best Engineering Books at BIG DISCOUNT, Click Here, https://www.engihub.com • Also, like us on / bestengineeringhub
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