As the pistons move the ports are covered up, the air is compressed between the two pistons, fuel is directly injected and the mix can be fired by spark or compression ignition. Intake and exhaust are done similarly to a two-stroke diesel-an external air-charger (be it supercharger or turbocharger) forces air into the cylinder through ports in one side of the cylinder sleeve. These outside pistons mirror the motion of the inner piston, moving toward the crankshaft as the inner piston moves away from it. The outside set of pistons is attached to the crankshaft via long, titanium connecting rods tied to a hefty bearing at the back of the piston. The inner set of pistons work in much the same way a traditional reciprocating-piston engine does. The engine is a two-stroke, horizontally opposed, twin-bore, four-piston engine-basically two engines worth of pistons stuffed into one engine's worth of cylinders. Now Ecomotors is retooling the concept to work as a clean-burning and efficient option for the civilian market. How it Works: The Ecomotors OPOC engine has been in development for about seven years and was originally part of a DARPA initiative to shrink the military ground vehicle powertrain packages.
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