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EcoMotors Passes 500 Hours of Successful Dyno Testing of OPOC Engine

EcoMotors International has exceeded more than 500 hours of successful dynamometer testing of its OPOC (opposed-piston, opposed-cylinder) engine. (Earlier post.)

We are tremendously excited to confirm that our test engines are surpassing our ambitious objectives for high fuel efficiency and low greenhouse-gas emissions. EcoMotors’ OPOC engine, which has the ability to cut fuel consumption in half, can play an important role in meeting the new 2016 standards aimed at significantly decreasing our dependence on foreign oil, and reducing greenhouse gas emissions.

—CEO Don Runkle

The opoc engine operates on the 2-cycle principle, generating one power stroke per crank revolution per cylinder. Each module consists of two opposing cylinders per module, with a crankshaft between them; each cylinder has two pistons moving in opposite directions. This design configuration eliminates the cylinder-head and valvetrain components of conventional engines, offering a more efficient, compact and simple core engine structure, the company says. The power density is more than 1 hp per pound of engine weight. The fully balanced opoc engine can be run on any liquid fuel.

Based in Troy, Mich. and Goleta, Calif., EcoMotors is developing high-efficiency engines—specifically the OPOC engine—for use in cars, light trucks, marine applications, agricultural vehicles, stationary generators, etc.; essentially anywhere conventional gas or diesel power is utilized.

EcoMotors is part of the Khosla Ventures portfolio of companies.


Henry Gibson

The OPOC engine can burn diesel or most jet fuels in a small and low weight package with high efficiency. The addition of the electric turbocharger can give even more efficiency and power in a small size.

There were engines built on the same principle with very large pistons that looked like old factory steam engines, but they did not have turbocharging. The original OPOC had more extensive piston scavenging, but this is not needed with the electro-turbo-charger.

There are adequate means for obtaining very clean exhaust from diesel engines, and diesel is a more efficient and less costly fuel to make. The artificial fuel DME which is stored like propane can also be used in such engines for very clean operation and can be made from natural gas and other carbon containing materials.

Small versions of the OPOC have always been my first choice for range extenders for Plug-In-Hybrid electric vehicles bought for long range travel. Because of the efficiency of hybrid vehicles of any kind, all vehicles should become hybrid, and any moneys now spent to subsidise solar cells or ethanol would cause the saving of more fuel if spent to increase the use of hybrid vehicles or cogeneration. ..HG..

Henry Gibson

Does not EcoMotors know that years of computer modeling and efficiency projection and additional investments must preceed any building and testing of actual models. ..HG..


I can't get it out of my head that 2 stroke engines are noisy and dirty.


"Noisy" is applicable. It comes from the loud outrageous claims by proponents.

"Dirty" is not applicable. It comes from oil mixed with the fuel to lube the crankcase with CC scavenging (using the lower side of the pistons to pump crankcase air into the upper part) - which OPOC does NOT use.

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