EcoMotors Claims 45% Greater Fuel Efficiency for Class 8 Trucks With OPOC Engine

EcoMotors OPOC
EcoMotors OPOC

In brief: EcoMotors International is a startup working on commercializing an opposed-piston, opposed-cylinder (OPOC) engine for medium and heavy applications. They showcased their EM100 module at the ARPA-E Summit and are claiming a 45% greater fuel efficiency for the concept.

The word

EcoMotors OPOC module cutaway drawing

An OPOC engine runs on the simple principle of opposing cylinders rather than side-by-side conventional engine layout. Each module for an engine comprises two cylinders, faced in opposition, operating on a 2-cycle principle with each crank revolution providing one power stroke. As one cylinder fires, the other is compressed and then the process reverses.

The OPOC engine concept is simpler, more efficient, and eliminates the cylinder head and valve train components of a conventional engine. The EcoMotors OPOC is capable of running on most any liquid fuel.

EcoMotors OPOC module demonstrator

The EM100 (EcoMotors 100mm cylinder bore) module would be one section of an engine which could produce up to 480hp for any vehicle up to a Class 8 truck. It would deliver 45% better fuel efficiency and emissions at the US Tier 2 Bin 5 level, bringing heavy-duty commercial trucks down to the emissions levels of light-duty diesels.

EcoMotors is developing several specification types for the engines, including military, medium commercial, and heavy commercial uses. The medium commercial 325hp unit running on standard diesel fuel produces a fuel economy improvement of 15% compared to the standard diesel engine counterpart.

Other options such as cylinder deactivation during the duty cycle would improve economy even more, achieving the 45% number claimed.

And so ...

Very interesting and forward-looking concept for ICE use. Commercial transportation makes up about 30% of the total fuel use in the U.S.

Photo credits: EcoMotors

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