February 9, 2014

Factors Affecting Detonation In IC Engine

Factors Affecting Detonation In Internal Combustion Engine:

In an internal combustion engine cylinder sometime sudden and violent knocks are experienced, this is known as "Detonation". This knock is set up by a high pressure wave giving loud pulsating noise as it strikes against cylinder walls, cylinder head and piston.

Following are the main factors, which affects detonation:-

01) The fuel used in internal combustion engine will considerably effects on the chances of detonation. Alcohol and benzol do not cause detonation but it can not be use due its low calorific value and other objections to use as fuel. Again alcohol cannot blend with petrol in the presence of water.

02) The detonation is also promoted by increase in compression ratio. The compression ratio at which detonation just occurs is known as the Highest Useful Compression Ratio. Higher the compression ratio higher the chances of detonation and lower the output.

03) If the carbon deposits are in the cylinder and used excessive sparking temperature, the detonation will increased rapidly.

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