The Intake Stroke: Fueling the Fire in Combustion Engines

a close up of the engine of a car

What is the Intake Stroke? The intake stroke is the first stroke of the four-stroke combustion cycle. During the intake stroke, the piston moves down the cylinder, creating a vacuum. This vacuum draws air and fuel into the cylinder through the intake valve. The intake valve then closes and the compression stroke begins. The intake …

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