Four-cylinder engines are usually associated with efficiency and compact packaging, yet a handful of engineers have stretched the format to astonishing sizes. The five engines below represent some of ...

Duvernay has the highest stock output production Quad 4: the 190-hp 1991 to 1992 RPO W41. The 1993 W41 lost 10 hp due to smaller exhaust ports. I have a 1992 Olds Achieva SCX with a W41 Quad 4 engine ...

After more than four years of frustrating delays, Blue Origin is finally making significant progress toward completing development of its powerful BE-4 rocket engine. At present, engineers and ...

Blue Origin’s BE-4 engines are being placed onto United Launch Alliance’s Vulcan rocket booster. (ULA Photo) Amazon founder Jeff Bezos’ Blue Origin space venture says it has completed delivery of the ...

The Earth is much larger than most people realize. You need to use engines if you want to efficiently navigate large sections of the planet. Everything from cars to planes relies on engines, but they ...

A Blue Origin BE-4 engine arrived at ULA's factory in Decatur, Ala. Credit: ULA via Twitter WASHINGTON — Blue Origin this week delivered a BE-4 rocket engine to United Launch Alliance. ULA will use ...

The Boeing B-52 Stratofortress looks like a relic from another era, and in some ways it is, but its eight small turbojets remain one of the most distinctive design choices in military aviation. Modern ...