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Four-stroke engine

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Four-stroke cycle used in gasoline/petrol engines. 1 = Intake, 2 = Compression, 3 = Power, 4 = Exhaust. The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.



Top dead center, before cycle begins 1 – Intake stroke 2 – Compression stroke
                                              Starting position, intake stroke, and compression stroke.
Fuel ignites 3 – Power stroke 4 – Exhaust stroke
                                        Ignition of fuel, power stroke, and exhaust stroke.

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