Engine compression is a measure of the pressure inside the combustion chamber of an engine. It is an important metric for engine performance, as it affects power output, fuel efficiency, and emissions. Low compression can lead to a loss of power and fuel economy, while high compression can lead to knocking and other engine problems.
Checking compression is a relatively simple procedure that can be done with a few basic tools. It involves measuring the pressure inside the combustion chamber of each cylinder. This can be done with a compression tester, which is a specialized tool that attaches to the spark plug hole.