The OPOC JP8 engines for OAV's planned as a standardized 1.2hp to 12hp family, are two-stroke Compression Ignition engines, consisting of opposed cylinders, each having two opposed pistons. All pistons are connected to a single crankshaft located between the two opposed cylinders by unconventional (long=low friction) connecting rods. Intake and Exhaust ports are located at the ends of the cylinder. These ports provide the necessary uniflow cylinder scavenging (there are no valves or camshafts). The crankshaft journals, which control the position of the pistons, are arranged asymmetrically such that for each cylinder, the exhaust ports open before the intake ports and close before the intake ports. This asymmetric timing is a must and provides for proper exhaust-blow-down and allows intake supercharging. The two-stroke engine has been eliminated by many as a viable future technology, despite its superior efficiency and power density, essentially because of its scavenging problems. The engineering community needs to see proof-of-concept with the OPOC technology to change their minds on the two-stroke engine. The OPOC engine will eliminate, current, unsolved two-cycle problems such as lack of precise scavenging, and improve upon two-cycle engine benefits in the areas of efficiency, size, very low vibration, and cost. This project will be the initial phase of a process leading to commercialization of the exceptional two-cycle OPOC engine. Through this project, we aim to make transparent the advantages of the OPOC engine technology over currently know four-cycle engines. The potential markets for the generic OPOC engine design are virtually all of the combustion engines for commercial or military sectors. The OPOC engine will reduce OEM costs since it has less than 60% engine parts compared to the short block and cylinder head of a conventional 4-cylinder in-line engine. Moreover, because of the OPOC engine's significantly smaller packaging dimensions and because the OPOC engine is vibration free, it has improved installation suitability, allowing further reduction in manufacturing costs. The application possibilities for the OPOC engine range from cars to off-road vehicles, unmanned vehicles and light aircraft. We at Advanced Propulsion Technologies, Inc. feel that military and commercial sources will use the OPOC engine in at least one application within five years. Once commercialized, other applications and successes will follow.
Keywords: Small Engine, Heavy Fuel, Two Stroke, Opposed Piston, Opposed Cylinder, Uniflow Scavenging, Asymmetric Timing, Hcci (Homogeneous Combustion Compress
