Viola, a rudimentary depiction of the boxer engine layout. You can see why it's also known as the horizontally ...

While over the decades others, like Volkswagen, Lancia, Alfa Romeo, Citroën and yes, even Ferrari have tried their hand at engines with horizontally-opposed cylinder layouts, today only Subaru ...

While most engines made in the last 100 years have adhered to the standard single-piston per-cylinder design, the TS3, also known as the "Commer Knocker," is an exception. The opposed-piston ...