THE BEECHMONT CREST AUTOMOTIVE LEARNING ZONE
Valves
Machined metal engine components that open and close the ports of the cylinder head. There are two types of engine valves: intake and exhaust. All engines have at least one of each type of valve per cylinder. Many recent engines are equipped with two sets of valves per cylinder.
- Intake valves control the flow of fuel and air into the combustion chambers. Intake valves are larger than exhaust valves.
- Exhaust valves regulate the flow of exhaust gases out of the cylinders.
Valve Guides
Small holes machined through the cylinder head. The valves fit into these holes and slide up and down in them during engine operation.
Valve Lifters
Also called a tappet, the valve lifters are elements of the valve train. Valve lifters ride on the cam lobes. Their main function is to transfer motion to the other elements of the valve train. The valve lifters remain in constant contact with the cam lobes during engine operation.
Valve Seats
Circular machined surfaces located in the openings to the combustion chamber ports. When the valve closes, it forms a seal against the valve seat.
Valve Train
The engine valves and associated parts. The elements of the valve train include the lifters, camshaft, push rods, rocker arms, valves, and valve spring assembly.
The main function of the valve train is to open and close the valves during engine operation.
