We may receive a commission on purchases made from links. While browsing auto repair and maintenance tools at your local parts store, you've likely come across compression testers like the Orion Motor ...

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.

A compression test reveals the condition of your engine's valves, its valve seats, and piston rings and whether these parts are wearing evenly.

The engine is a single cylinder variant of modern design which meets Euro 4 emissions requirements. Work output and heat release characteristics for the two compression ratios have been compared at an ...

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

In the fuel test, the compression is raised until the engine begins to “knock”—ie, the fuel in the cylinder ceases to burn smoothly and instead detonates before it can be ignited by the ...

Increasing an engine’s compression ratio is a proven way of unlocking extra horsepower, but there’s a point of diminishing returns. The team at Garage 54, the Russian mechanics who built a V16 ...

Cold startability was measured for compression ratios of 14:1, 16:1 and 18:1 at 32°F, 14°F, and -4°F. The study indicated desirability of lower compression ratios for performance and higher ...