During the intake development, which component opens to admit air during the intake stroke?

During the intake development, which component opens to admit air during the intake stroke?

• A. Piston
• B. Camshaft
• C. Intake valve
• D. Exhaust valve

Answer: (C)

During the intake stroke, the piston moves downward, creating a suction that pulls air into the cylinder. This air can enter only if the pathway is open, and the component that opens to admit air is the intake valve. The intake valve is opened at the right time by the camshaft so air (and fuel in a gasoline engine) can flow into the cylinder, then it closes to seal the chamber for the compression stroke. The piston itself moves the air but doesn’t open the valve, and the exhaust valve handles the exhaust stroke, not the intake.

During the intake stroke, the piston moves downward, creating a suction that pulls air into the cylinder. This air can enter only if the pathway is open, and the component that opens to admit air is the intake valve. The intake valve is opened at the right time by the camshaft so air (and fuel in a gasoline engine) can flow into the cylinder, then it closes to seal the chamber for the compression stroke. The piston itself moves the air but doesn’t open the valve, and the exhaust valve handles the exhaust stroke, not the intake.