Boxer engines may not be that popular in cars, but they're a common sight in smaller aircraft. But why do these small planes ...

The horizontally opposed engine was created in 1897, and Subaru is one of only a few automakers to rely almost entirely on its layout. Unlike more traditional engines, which align their pistons in a V ...

Click to open image viewer. Once the largest independent manufacturer of automotive engines, Detroit’s Continental Motors Corporation purchased the rights to a single-sleeve valve engine design in ...

Flat engines are horizontally-opposed piston engines, and this group includes Boxer engines, but not opposed-piston engines like the Cummins 14.3L Advanced Combat Engine (ACE) designed to power tanks.