Automakers once bet big on bizarre ideas—from swirling airflows to variable compression—and the results were as fascinating ...

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

Air flowing into a four-stroke diesel engine gets cleaned as it passes through the air filter. It then flows through tubing until it is compressed in the spinning blades of the turbo. As a result, the ...

Both engines have ditched the Otto-cycle setup in favor of a Miller-cycle, which keeps intake valves beyond bottom dead center. This means that when the piston reaches the bottom of its stroke, the ...

Mazda has never been afraid of some truly odd engine designs. It keeps trying to make the Wankel work. It has a gas engine with compression ignition. And the company has made 14:1 compression gas ...

The AutoGuide research department strikes again— this time discovering a wild new engine concept from Porsche that could bring huge gains in both efficiency and power density. Porsche has filed a ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Volvo leans heavily into its Swedish roots, building hardy machines ...