Abstract: A crankcase inducted self-supercharging four-cycle internal combustion engine that uses cylinder pairs as an induction pump. The cylinder pairs are arranged in a 360-degree crank throw so that both pistons rise and fall together. The system uses two valves and two tubes force air into the crankcase and then into the cylinders in a supercharged mode. It can also operate with both valves closed in a naturally aspirated mode. In this case, air is directed directly into the cylinder through an intake manifold.

Abstract: A crankcase inducted self-supercharging four-cycle internal combustion engine that uses cylinder pairs as an induction pump. The cylinder pairs are arranged in a 360-degree crank throw so that both pistons rise and fall together. The cylinders are synchronized so that when one cylinder is on the intake stroke, the other is on the power stroke. A two-cycle reed valve is installed on a crankcase inlet port to draw air into the crankcase on the upstroke of the pistons. Since both pistons rise and fall together, each upstroke draws a volume of air equal to the volume of two pistons into the crankcase. When both pistons are on the down stroke, this air is compressed and, then moved into a manifold connecting the crankcase to the inlet valves of the cylinders. Thus, it is possible to double the air available for each cylinder without using storage tanks or other devices.