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Zhongding and EcoMotors activate their partnership to commercialize OPOC engine

Zhongding Holding (Group) Company, Ltd. and EcoMotors International have activated their partnership (established in 2010, earlier post) to develop and commercialize the opposed-piston, opposed cylinder (opoc) engine for both power-generation and vehicle applications.

This important contract with EcoMotors is an expression of our commitment to bringing advanced products to our customers in the near future. To this end we are—with support from both our provincial and national governmental bodies—actively moving toward our objective of a state-of-the-art opoc engine manufacturing facility in Anhui Province.

— Xia Ding Hu, Chairman of Zhongding Holding (Group) Co., Ltd

EcoMotors’s primary investor, Khosla Ventures’ Vinod Khosla, sees the EcoMotors - Zhongding alliance as a reflection of the compelling “maintech” relevance of OPOC to emerging markets.

The only truly disruptive technologies are those that can provide not only rapid payback but also economic and carbon benefits in large and rapidly growing markets such as China without the need for subsidies or massive infrastructure investments. Among next-generation propulsion systems, the opoc engine is broadly applicable and can provide lower carbon emissions than almost any other technology.

—Vinod Khosla

The Zhongding Holding (Group) Co., Ltd. is a large Tier 1 automotive supplier which includes Zhongding USA, based in Monroe, Michigan.

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



As someone that has followed all these inventor engines, I can't say I have been very comfortable with this engine and the connecting rods. Something just doesn't sit right with me. The injector is not in an optimal location.

But I stumbled upon this Patent Pending , a Barrel Engine, 2 stroke, Direct Injected, Internally Charged vis a Stepped Piston and a rotary cup off the main shaft to help control the airflow to the pistons after charging. Ingenious to say the least....


There are LOTS of engine patents in effect at this moment, but you do not see many engines in development. Just a radial vane rotary design has more than 20, but I know of none that are being developed.

Nick Lyons

I continue to think that the perfect application for this engine is for light aircraft--high power density, turbo-charged, mechanically simple and presumably low maintenance. I suppose it takes a lot longer to certify a new design for aircraft applications, so perhaps that's why they are focusing on vehicles and power generation. I'd be following developments if I were a designer at Cessna.

George Furey


There an old article on here that used the OPOC in a helicopter. I agree power density is one of the main strengths of this engine.


Single engine aircraft go for reliability proven over decades for obvious reasons. A hybrid plane could work, if the engine fails you still have thrust from the motor to make landing a more probable outcome.

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