Introduced in 1957 as a counterpart to the West German VW Beetle, the East German Trabant was powered by a 600cc 2-cylinder air ... air-cooled horizontally-opposed engine ever made by the company.

A few aisles away, we spotted yet another horizontally opposed head-scratcher: a 2.0-liter flat-eight engine ... four, or eight-cylinder engines configurable as naturally aspirated with port ...

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 ...