Opposed Piston Opposed Cylinder Engine

An extremely lightweight opposed piston opposed cylinder (OPOC) engine has been developed under a Defense Advanced Research Projects Agency (DARPA) program. FEV and Advanced Propulsion Technologies (APT) were asked by the U.S. Army Tank Automotive Research Development and Engineering Center (TARDEC) to modify this engine for heavy-truck applications. VIDEO->

Via EngineeringTV

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  • With the major car companies on the brink of closure, why not offer this tech to them for their future cars?

  • gottobesaid

    For a start it is not a new Idea it has been used in marine engines in the 1930’s. Have a look at the Doxford engines I served as a marine engineer on a ship build in 1943 (Port Auckland) that had a LB Doxford which was a six cylinder opposed piston 2 stroke diesel. The guys science is also not correct as the exhaust piston is not capable of providing 50% of each cylinders power in FACT it is less than 20%. Other companies used a exhaust piston on eccentrics to provide the advanced timing but these did not transmit power. None of these are produced today as modern charge air coolers and read valves are much more efficient. The only advantage this so call new engine has is the opposed cylinder arrangement giving better balance of the forces which is the same as any boxer engine and allows a lighter engine.
    The exhaust piston does give better port timing but the additional weight is easily greater than achieving the same increase in efficiency as other timing methods.

  • gottobesaid

    forgot to add that the best most efficient way to control the exhaust port timing is the use of a pulse wave as used on a motorcycle expansion chamber.

  • Anonymous

    Umm what about the Deltic Napier engines of years gone by in the United Kingdom they have been around for many decades.

    So no this is not a new idea it’s an old idea rehashed !!!