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An engine is complex unit in which different components are assembled together, and fuel is burned to produce power or energy. The engine converts chemical energy (heat energy) into mechanical energy, which is then utilised for vehicular movement. There are different processes of fuel combustion. When the fuel is burned within the engine, it is called an Internal Combustion (IC) engine, and when it is burned externally and the produced steam is used for the mechanical movement, it is called an External Combustion (EC) engine. Nowadays, automobile engines are quite economical due to the developments taking place in the field of internal combustion engine. On the basis of the process of ignition, the automobile engines are classified into spark ignition engine (petrol or gas) and compression ignition engine (diesel). In an IC engine, the reciprocating motion of the piston is converted into rotary motion of the crankshaft and the produced powe