![]() 2 – Compression stroke In compression stroke,Once piston reaches BDC & moves back TDC,inlet valve will be closed,As the piston moves towards TDC,It compress air fuel mixture inside the cylinder & compression takes place,Hence it is called compression stroke.Outlet valve will be closed and inlet valve will be open to allowing the fresh charge of mixed fuel & air into the cylinder. 1 – Intake stroke In suction stroke piston starts at Top Dead Center (TDC) of the cylinder and moves to the Bottom Dead Center (BDC).Working principle of four Stroke Engine Following are the four strokes 1 – Intake/Suction stroke 2 – Compression stroke 3 – Expansion stroke 4 – Exhaust stroke. ![]() Each stroke consist of 180°,of crankshaft rotation and hence a cycle consist of 720°,of crankshaft rotation. It consist of 4 stroke ,one cycle operation is completed in 4 stroke of the piston, That is one cycle is completed in every 2 revolutions of the crankshaft.
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