At the end of this stroke, a spark plug provides the compressed fuel with the activation energy required to begin combustion. Compression stroke: The intake valve is closed, and the piston moves up the chamber to the top.Intake stroke: The piston moves downward to the bottom, this increases the volume to allow a fuel-air mixture to enter the chamber.There is an animation to the right (Figure 1) of a four-stroke engine and further explanation of the process below. A four stroke engine delivers one power stroke for every two cycles of the piston (or four piston strokes). The four-stroke engine is the most common types of internal combustion engines and is used in various automobiles (that specifically use gasoline as fuel) like cars, trucks, and some motorbikes (many motorbikes use a two stroke engine). 1:fuel injection, 2:ignition, 3:expansion(work is done), 4:exhaust.
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