MV Agusta revives a dual-crank engine design with a radical five-cylinder square concept, proving that internal combustion innovation is alive and well. The square engine layout uses dual crankshafts ...

Pioneered by Ariel and used by a few other brands, it was wonderfully balanced and sounded great. How come it's not in use today? Did you know that a square four engine used to be a thing? In fact, ...