The process of combustion of diesel engine is different from that in a petrol engine. The heat generated in combustion chamber is utilized to perform work. The properties required in diesel fuel are different from those required in petrol. The desirable properties of diesel fuel are viscosity, sulphur content volatility, ignition quality and it should be free from water and sediments. The viscosity indicates that the internal resistance between the fuel molecules. Fuel is injected in the combustion chamber. High viscous diesel fuel is not finely atomized and requires more injection pressure, whereas the less viscous diesel fuel is well atomize, but causes more wear in the injection unit and leaks through the clearance.
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