In a four-stroke engine, which stroke is the intake stroke?

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Prepare for your ASA Powerplant Mechanic Exam with interactive flashcards and multiple choice questions. Each question features detailed hints and explanations to ensure you're ready for the test.

Multiple Choice

In a four-stroke engine, which stroke is the intake stroke?

Explanation:
During the intake stroke, the piston moves downward with the intake valve open, creating a low-pressure area that draws the air-fuel mixture into the cylinder. This fills the cylinder in preparation for the next step, the compression stroke, where that mixture is squeezed before ignition. The other strokes involve compressing the mixture, igniting it to produce power, and then exhausting the burnt gases. So the description that matches drawing in the air-fuel mixture describes the intake stroke.

During the intake stroke, the piston moves downward with the intake valve open, creating a low-pressure area that draws the air-fuel mixture into the cylinder. This fills the cylinder in preparation for the next step, the compression stroke, where that mixture is squeezed before ignition. The other strokes involve compressing the mixture, igniting it to produce power, and then exhausting the burnt gases. So the description that matches drawing in the air-fuel mixture describes the intake stroke.

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