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en.wikipedia.org/wiki/Opposed-piston_engine

An opposed-piston engine is a piston engine in which each cylinder has a piston at both ends, and no cylinder head. Petrol and diesel opposed-piston engines have been used, mostly in large scale applications such as ships, military tanks and in factories.

www.techexplorist.com/innovative-opoc-engine-opposed-piston-engine/4280

The OPOC engine is an opposed-piston opposed-cylinder, 2-stroke engine. It consists of two cylinders with a piston at both ends. It has no cylinder head, so there are no valves. Each piston travels about half the distance of a cylinder in a conventional engine. As compared to other conventional engines, the OPOC has drastically small size.

auto.howstuffworks.com/opposed-piston-opposed-cylinder-engine1.htm

The cylinders in an automobile's internal combustion engine are capped so that the gases held in the area between the top of the piston and the top of the cylinder can't escape. However, there are also two valves at or near the top of each cylinder that can be opened and closed mechanically.

www.motortrend.com/news/at-least-one-automaker-plans-to-produce-an-opposed...

James Atkinson, whose name adorns many of today's high-efficiency engines, originated his cycle on an opposed-piston engine in 1882, but the idea really gained traction in the '30s and '40s, when ...

opposingcylinders.com

“In a world where opposing views often push us apart, the Opposing Cylinders family is a group of like-minded people that pull together with their passion of cool cars and their owners/builders that bring them to life.” Kevin

www.caranddriver.com/features/columns/a25224238/achates-opposed-piston-engine

That engine had three long cylinders in a row, with one crankshaft below and another above the row of cylinders. A pair of opposed pistons reciprocated in each cylinder, each connected to its own ...

www.cnet.com/roadshow/news/radical-new-engines-make-a-run-at-reality

Radical new engines make a run at reality in the F-150. Achates' highly efficient opposed piston engine is set to find a home in the Ford. Brian Cooley explains what makes it special.

auto.howstuffworks.com/opposed-piston-opposed-cylinder-engine.htm

One of the most exciting new types of internal combustion engines is the opposed-piston opposed-cylinder engine, and if you can't remember all those tongue-twisting syllables you can just call it an OPOC engine. (Don't feel bad. Everybody else calls it that too.)

achatespower.com/our-formula/opposed-piston

Opposed-Piston. Throughout the 20th century, when the utmost fuel, weight and volume efficiencies were required to propel aircraft, ships and vehicles, an unconventional type of compression ignition engine was used: opposed-piston engines (1). Two major strengths of this type of engine make them better: