Compression test kits do just what they say: measure the ability of each cylinder of your engine to combust the fuel/air mixture without losing any of the resulting energy.

A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ability to hold pressure.

You’ve heard the term compression ratio before, but have you ever wondered exactly what it means? Well, it’s time to explain exactly what compression ratio is, and why every carmaker is now ...

A misfire means that a cylinder in your engine isn’t producing the power it should because the air-fuel mixture in it didn’t properly ignite and burn.

More power, more efficiency Compression ignition engines are a big breakthrough—we got to try one It's called Spark Controlled Compression Ignition, and Mazda made it work.

We explore why a higher compression ratio means more power for your hot rod, and explain what to do to maximize that bump in power.