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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 ...

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.

dieselbobllc.com/2018/09/17/opposed-piston-engines

The cost of opposed piston engines relative to a 4-stroke diesel can be debated. The most direct comparison is probably the 3 cylinder opposed piston engine to the traditional inline 6 diesel. Both engines have similar torque smoothness with the same number of power strokes per revolution and both engines have good inherent balance.

arpa-e.energy.gov/?q=slick-sheet-project/highly-efficient-opposed-piston...

The proposed technology has the potential to offer manufacturers a full-range of cost-effective solutions to improve vehicle efficiency and reduce CO 2 emissions.A highly efficient hybrid opposed-piston engine can be easily integrated in the existing fueling infrastructure and offers the power and convenience that U.S. consumers demand.

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.

www.freep.com/.../12/12/opposed-piston-engine-new-breakthrough-old-tech/76719440

Opposed-piston engine: New breakthrough with old tech? ... opposed-piston gasoline compression engine that could improve fuel efficiency by 50% or more on large passenger vans, pickup trucks, SUVs ...

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

An engine that uses two crank shafts at opposite ends of what’s called an Opposed Piston Engine. New technologies and discoveries have a habit of making us re-evaluate established norms, except in this instance the technology involved isn’t new at all, it’s over 100 years old.

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 ...

fordauthority.com/2018/01/super-efficient-opposed-piston-engine-to-start...

Achates Power and Aramco Services have developed a new, super-efficient gasoline internal-combustion engine that will start testing in the Ford F-150 later this year. The 2.7-liter mill features an opposed-piston design, with six pistons and three cylinders; uses a two-stroke cycle; and features zero spark plugs, relying instead on compression ignition.

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: