Abstract: A balanced five-stroke cycle, five cylinder engine, wherein the five cylinders are parallel and arranged around a shaft mounted in a centrally disposed bore in the engine block, wherein the shaft is parallel to the cylinders, wherein power pistons in the cylinders dwell motionless for the intake part of the cycle between the vacuum stroke and the compression stroke of each power piston; induction of the combustion mixture resulting from the partial vacuum created by the vacuum stroke of the power piston, and wherein the position of each power piston is governed by a power piston cam mounted on the shaft, the shaft and bore on the centroidal axis of symmetry of the radially spaced apart array of five cylinders corresponding to the pistons, the opening and closing of exhaust ports governed by an exhaust piston cam mounted on the shaft moving exhaust pistons along the cylinders.

Abstract: A balanced five-stroke cycle, five cylinder engine, wherein the five cylinders are parallel and arranged around a shaft mounted in a centrally disposed bore in the engine block, wherein the shaft is parallel to the cylinders, wherein power pistons in the cylinders dwell motionless for the intake part of the cycle between the vacuum stroke and the compression stroke of each power piston; induction of the combustion mixture resulting from the partial vacuum created by the vacuum stroke of the power piston, and wherein the position of each power piston is governed by a power piston cam mounted on the shaft, the shaft and bore on the centroidal axis of symmetry of the radially spaced apart array of five cylinders corresponding to the pistons, the opening and closing of exhaust ports governed by an exhaust piston cam mounted on the shaft moving exhaust pistons along the cylinders.