Today, internal combustion engines in cars, trucks, motorcycles, aircraft, construction machinery and many others, most commonly use a four-stroke cycle. The four strokes refer to intake, compression, combustion (power), and exhaust strokes that occur during two crankshaft rotations per working cycle of the Gasoline engine and Diesel engine. The cycle begins at top dead center (TDC), when the piston's farthest away from the axis of the crankshaft. On the intake or induction stroke of the pisto… (More on Four-stroke)