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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.

achatespower.com/our-formula/opposed-piston

Opposed-piston architecture: With two pistons per cylinder, working in opposite reciprocating action, these engines do not need cylinder heads which are a major contributor to heat losses in conventional engines. Ports in the cylinder walls replace the complex poppet valves and friction-creating valve trains of conventional engines.

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

The opposed cylinder with the piston has very low bearing loads. It means there will be less friction as compared to the conventional engine. Each piston in the engine has a single crankshaft with connecting rods (inner pistons have short connecting rods, and the opposing outer pistons have long connecting rods).

thekneeslider.com/ecomotors-opoc-two-stroke-engines-opposed-piston-opposed...

EcoMotors Opposed Piston Opposed Cylinder 2 stroke engine. Two stroke engines are favorites of everyone who wants a really compact engine with lots of power, there are fewer parts and power delivery on every stroke.

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

And, Fromm points out, opposed-piston engines are inherently smooth, so a single-cylinder, two-piston version could make an ideal range extender for a PHEV, especially since it can be made into a ...

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.youtube.com/watch?v=UF5j1DvC954

Research has shown two-stroke opposed piston engines to be wildly efficient. 3 cylinder designs are the most efficient, and it’s possible to achieve brake thermal efficiencies as high as 55%, a ...

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.)