How boxer engines work, why they’re not just “flat” engines, and a 120-year evolution traced from the 1899 Benz to the latest Porsche and Subaru boxers. Boxer engines feature flat, opposing pistons ...

Subaru, already an outsider with its flat-four engines and all-wheel-drive systems in passenger cars, looked to the far corners of the engineering world in the early 1990s to devise a novel solution ...