Abstract: A rotary piston unit is fluid and mechanically connected to an internal combustion engine. The compressor of the rotary piston unit provides the initial compression of the air. An intercooler cools the partially compressed air prior to its introduction into the internal combustion engine. A shaft connection between the rotary piston unit and the internal combustion engine is used for power transmission and synchronization. In some configurations, the phase relationship of the shafts (pistons) is important to obtain maximum efficiency of the overall expansion process. The phase relationship of the shafts is relatively unimportant for the overall compression process because the volume of the intercooler effectively decouples the compression process of the rotary piston unit from the compression process in the internal combustion engine. Fuel is injected into the internal combustion engine and ignited in a conventional manner.

Abstract: A simple, piston ported, two stroke engine having low weight, small size, low fuel consumption, enhanced power output and reduced exhaust emissions. A rotary exhaust valve adjacent to the cylinder exhaust ports closes the exhaust at completion of cylinder blowdown and as the cylinder inlet ports open. A crankcase pump forces fresh, cold, dense air plus fuel mixture into the cylinder via the cylinder inlet ports. Thus, the cylinder exhausting process is separate from the cylinder filling process and no air plus fuel mixture flows out the exhaust. Also, to ensure reliable ignition every cycle, a uniquely contoured top surface on the piston concentrates and delivers compressed, dense, air plus fuel mixture to the ignitor in the combustion chamber.