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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.matfoundrygroup.com/News and Blog/What_is_the_Opposed_Piston_Engine_and_Why...

The Opposed Piston Engine goes beyond this by having no cylinder heads at all – but then comes back around by needing to have two crank shafts instead. It seems a bit like robbing Peter to pay Paul, except it isn’t because you gain in other areas. Image Courtesy of Pinnacle Engines.

www.quora.com/Why-are-opposed-piston-engines-not-used-in-cars-today

An opposed-piston engine is NOT an opposed cylinders engine, as most other folks who answered falsely assume! Here is an Ukrainian KMDB 6-TD opposed-piston battle tank engine: And this is a Rootes-Commer TS3 opposed-piston rocker arms truck engine...

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

Theory suggests that an opposed-piston engine has an efficiency advantage because, since there are no cylinder heads, less heat is lost to the cooling system. Think about a conventional combustion ...

www.researchgate.net/post/Why_the_opposed_piston_engines_are_not_in_use

Why the opposed piston engines are not in use? ... You are correct that the opposed piston engine is highly efficient. The issue currently is in the control, especially during transient operation. ...

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:

www.youtube.com/watch?v=JoQkTIfAB2U

The Achates Power Opposed-Piston Engine. Increased fuel efficiency, cost effective with inherently low emissions. A Fundamentally Better Engine.

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 ...

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.