This event is called the power or combustion stroke. When combustion occurs inside a cylinder, it creates an explosive force that pushes the piston down. If you’re not familiar with the power transfer process, here is a quick overview. Therefore, while one cylinder is on the intake stroke, another is on the compression stroke, another on the power stroke and yet another on the exhaust stroke. The four stages/strokes are intake, compression, power and exhaust strokes. Most engines today are classified as four stroke engines where stroke refers to the up or down travel of a piston. The sequence in which the cylinders generate power is called the firing order, the order in which the cylinders are fired. The combustion event, and therefore the movement of the pistons, must be coordinated to ensure continuous production of power as long as the ignition is on, engine is running, and all other enabling conditions are met. The power to turn the crankshaft is made available to the piston by the occurrence of combustion inside the combustion chambers (cylinders) that house the pistons. You probably already know that an engine has pistons which convert their reciprocating motion (up and down motion) to rotary (rotational motion) of the crankshaft.
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