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Mazda announces SKYACTIV-X: gasoline Spark Controlled Compression Ignition

Green Car Congress

In light of the rapid changes taking place in the automotive industry, the new vision takes a longer-term perspective and sets out how Mazda will use driving pleasure—the fundamental appeal of the automobile—to help solve issues facing people, the earth and society. the greatest contribution to reducing carbon dioxide emissions.

Mazda 186
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Porsche's New Six-Stroke Engine Explained

The Truth About Cars

On a four-stroke motor — like the one that’s situated beneath the hood of your daily driver — there is an intake, compression, power, and exhaust stroke. Additionally, the second compression phase helps to “scavenge” gases [sic] from the first combustion, leading to cleaner emissions and improved thermal efficiency.

Porsche 109