Mazda's willingness to leave the Otto cycle behind when designing its engines brought us the rotary-powered RX-7 and RX-8, ...

A newly published patent application details how to apply the efficiency tech to longitudinal engines.

A gasoline piston engine that can dynamically change its compression ratio —that is, the amount by which the piston squeezes the fuel-air mixture in the cylinder—has long been a holy grail of engine ...

Porsche has patented an innovative six-stroke engine that combines the benefits of a two-stroke engine's power with the ...

Like countless other 19th-century inventors, entrepreneurs, and tinkerers, British engineer James Atkinson sought ways to improve on the Otto four-stroke combustion engine, first produced in 1876. The ...

Want to know how healthy or unhealthy your engine really is? Get yourself a compression tester and find out. Despite how complex many modern vehicles are, you can do many common repair and maintenance ...

More and more, manufacturers are using engines that take advantage of what's called the Atkinson cycle for engine combustion, especially with hybrids. A great example is the new-for-2017 Toyota Prius ...