Answer :
Final answer:
An engine valve train includes the camshaft, lifters, pushrods, and rocker arms, which control the engine's valve operation critical for the intake, compression, power, and exhaust strokes of an internal combustion engine.
Explanation:
The components that normally make up an engine valve train include the camshaft, lifters (or tappets), pushrods, and rocker arms. This system is responsible for controlling the timing and duration of the engine's valves opening and closing. During the intake stroke, the valve train ensures that valves open to allow the air-fuel mixture to enter the cylinders. For the compression stroke, it keeps the valves closed, allowing the mixture to be compressed. In the power stroke, after the mixture is ignited and expands, the valves remain closed until the gas has done its work on the piston. Finally, during the exhaust stroke, the valve train allows the opening of the valves to expel the burnt gases, preparing the engine for the next cycle.
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