The Operation of Internal Combustion Engine: Compression Stroke

Compression Stroke in Internal Combustion Engine

During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber, both the intake and exhaust valves are closed. This is known as the compression stroke.

Explanation of Compression Stroke

The piston rises and compresses the fuel in the cylinder during the compression stroke. Both valves have to be closed in order to compress the fuel effectively. If either valve were open, even slightly, the gases wouldn't get compressed properly. They would just escape into the fuel or exhaust line through the open valve, leading to inefficient compression.

Correct Answer

Correct Answer: Both the intake and exhaust valves are closed.

I just took the test and my answer is a. both the intake and exhaust valves are closed.

During the compression stroke of an internal combustion engine, which valves are closed?

Both the intake and exhaust valves are closed during the compression stroke of an internal combustion engine.