Uploaded September 2023 | Updated September 2026, 1 week ago

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Four stroke gasoline/petrol engines use four strokes of a piston to complete one combustion cycle. The four strokes are: intake, compression, power, and exhaust.

Intake stroke: The piston moves down, drawing air into the cylinder via the air intake valves.

Compression stroke: The piston moves up, compressing the air within the cylinder.

Power stroke: Fuel is injected and a spark plug ignites the air-fuel mixture, causing a controlled explosion. The expanding gases force the piston downwards.

Exhaust stroke: The piston moves up, forcing the exhaust gases out of the cylinder via the exhaust gas valves.

The four strokes repeat themselves over and over again, generating power, then transferring it to the load.

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