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Generac and EcoMotors to partner on opoc engine development for power generation

EcoMotors International and Generac Power Systems, Inc. will jointly develop the EcoMotors opoc (opposed-piston opposed-cylinder) engine for Generac products. The agreement is designed to enable Generac to apply the opoc technology to its range of residential, commercial and industrial power generation solutions.

Since 1959, Generac has been a manufacturer of backup power generation products serving residential, light commercial and industrial markets. Generac’s power systems range in output from 800 watts to 9 megawatts and are available through a network of independent dealers, retailers and wholesalers.

The opoc engine comprises 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 valve-train components of conventional engines, offering an efficient, compact and simple core engine structure.

In February, Navistar International Corporation reached a development agreement with EcoMotors International in support of the company’s opoc engine architecture. EcoMotors International’s first product targeted for commercial application is a turbo-diesel version of the opposed-piston, opposed-cylinder engine.

The two primary investors in EcoMotors are Khosla Ventures and Bill Gates.


Henry Gibson

This is very great news. I have been metioning the OPOC for years. I would have liked it to come in a very small size like one of the prototypes but any commercial production is welcomed. It will probably be like some of the other generac models and run on a mix of diesel and natural gas when natural gas is available. ..HG..


UPS systems for buildings are a good application, in this case they could supply to the building and grid even with the power on to log hours and data.


Take a look at the videos of the PatOP and OPRE prototype engines running on Diesel fuel, at the pattakon web site

The full balanced single-cylinder two-opposed pistons PatOP basic-module has some 50% fewer parts than the basic-module of the OPOC of EcoMotors that comprises two opposed-cylinders and four-opposed-pistons to counter-balance the inertia forces.

The PatOP is more fuel-efficient: as compared to the OPOC of EcoMotors, it provides some 20% additional time (longer piston dwell near the Combustion Dead Center) for the efficient combustion of the fuel.

The PatOP's cross-head architecture enables "four stroke like" lubrication and lubricant consumption.

For power-generation-sets, the basis of an OPRE engine driving two counter-rotating electric generators is not only perfectly rid of inertia vibrations (like a power set based on a Wankel rotary or on a V-12) but it is also perfectly rid of power pulses vibrations.
This is why an OPRE range-extender has better NVH properties than the FEV and AVL Wankel-rotary range extenders.

Manousos Pattakos

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