The compression ratio isn’t just a number: it’s one of the greatest determining factors in engine building. Compression ratio determines the type of fuel, how much boost, and has a significant ...

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.

With a simple diesel engine compression test, it is possible to spot compression problems before they get worse. Here’s information on these tests and how to decide if it is time to perform one.

Compression Tests When discussing a compression test, the question always comes up about how the results are indicative of the engine's compression ratio. The blunt answer is they are not.

We walk you through a compression test, a great way to determine the condition of your valves and piston rings.

We take a close look at what engine compression means, what it does, and how to test it.

Around 2001, Saab Automobile introduced a bold new engine concept that used a hinged, two-part engine block to vary the compression ratio automatically.

Variable Compression Ratio Engines have been some sort of a Holy Grail, and now Porsche proposes a viable solution for this ...

How to Calculate Compression Ratio from Scratch As an example, let's calculate the CR for a popular big-block Chevy application.

Is your engine underperforming? Our expert shares how a diesel engine compression test could provide the diagnosis.