What component opens and closes intake ports located above cylinders?

What component opens and closes intake ports located above cylinders?

• A. Valves
• B. Pistons
• C. Camshaft
• D. Timing belt

Answer: (A)

The valves are the component that opens and closes intake ports located above the cylinders. The intake valve sits in the cylinder head at the intake port and moves up to let the air-fuel mixture into the combustion chamber during the intake stroke, then closes to seal the chamber for compression and ignition. The camshaft provides the timing by pushing on valve mechanisms to hold the valve open when needed, but the actual opening and closing action is performed by the valve itself. Pistons move inside the cylinders and do not open or close the ports, and the timing belt simply drives the camshaft that actuates the valves.

The valves are the component that opens and closes intake ports located above the cylinders. The intake valve sits in the cylinder head at the intake port and moves up to let the air-fuel mixture into the combustion chamber during the intake stroke, then closes to seal the chamber for compression and ignition. The camshaft provides the timing by pushing on valve mechanisms to hold the valve open when needed, but the actual opening and closing action is performed by the valve itself. Pistons move inside the cylinders and do not open or close the ports, and the timing belt simply drives the camshaft that actuates the valves.