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Working principle of gasoline engine
Sep 19,2025
The working principle of gasoline engines is based on a four stroke cycle (intake, compression, power, exhaust):
Intake stroke: The piston moves from top dead center to bottom dead center, the intake valve opens, and the exhaust valve closes. Negative pressure is formed inside the cylinder, and the mixture of air and gasoline is sucked into the cylinder.
Compression stroke: The piston moves from bottom dead center to top dead center, and both the intake and exhaust valves are closed. The mixture is compressed, and the temperature and pressure increase, preparing for combustion.
Working stroke: When the piston reaches the top dead center, the spark plug ignites the mixture, and the high-temperature and high-pressure gas generated by combustion pushes the piston downwards, which drives the crankshaft to rotate through the connecting rod and outputs power.
Exhaust stroke: The piston moves from bottom dead center to top dead center, the exhaust valve opens, and the intake valve closes. The exhaust gas is discharged from the cylinder in preparation for the next cycle.
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