While an engine compression tester may not be the most common tool in a mechanic's garage, they can be very useful, especially for older cars.

Curious to learn just how healthy or unhealthy your engine is? Get yourself a compression tester and find out. See the best compression testers here.

Compression testing is another good tool to use when diagnosing an engine. Combining the results of a leak down test with a cranking compression test can indicate an engine's potential.

We dyno test a low compression Ford 5.4L against a high compression variation and see which makes more power - Muscle Mustangs & Fast Fords ...