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The combustion process in a diesel engine comes in four steps 1.Suction 2.Comression 3.Power 4.Exhaust these are called as strokes when the piston travells from top end to bottom end Respectively.

1.Suction : In this stroke the fresh air through the aircleaner from the atmosphere which is sucked by the piston (when the valve opens)when the piston travells from TDC to BDC (TOP to BOTTOM) get trapped inside the cylinder(Combustion chamber) and valve closed.

2.Compression : In this stroke the air which is trapped inside the cylinder (when the both valve are closed)getting hot due to compression by the piston when it travells from bottom to top it gets hotter.

3.Power : In this stroke the hot air now comes in contact with fuel when the injectors sprayes the fuel in a fine automized form and the fuel gets burnt by a higher temperature upto 600 degree C.

4.Exhaust : In this stroke the exhaust valve opens when the piston travels from TDC to BDC and pushes the burnt gases out through the exhaust valve exhaust manifold scilencer and then to the atmosphere.

This answer is represent the best of my knowledge

from - Tapan Borgohain

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Q: What is the combustion process of diesel engine?
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