A four stroke engine is defined as that in two cycles and four strokes such that suction compression expansion and exhaust will occur to produce one power stroke is known as four stroke.
The 4s engine is nothing but it has two valves one is inlet and another is exhaust. the stroke will be done one by one like first suction,compression,power and exhaust, and for every four stroke there will be one power.this is four stroke engine
an engine in which the different processes called(inhaling the charge,compressing it,burningit,exhausting itoutside)are performed in engine cylinder where piston travels from one dead center to another deadcenter 4 times .
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