Abstract: The horizontally opposed center fired engine improves on the traditional design of the horizontally opposed engines and center fired engines with a better engine geometry. The present invention utilizes four pairs of opposing pistons to compress a larger volume of air-fuel mixture within four different cylinders. The four different cylinders are radially positioned around a center axle in order to achieve a perfectly symmetric engine geometry. The center axle consists of two different shafts spinning in two different directions, which could drastically reduce engine vibrations in the present invention. Engine vibrations are caused by a change in engine speed and result in a loss of energy. Due to the design, the present invention will only experience energy loss in the form of entropy and friction. Thus, the present invention can convert a higher percentage of chemical energy into mechanical energy than any other internal combustion engine.

Abstract: A combustion engine comprising; a pair of opposed cylinder elements (2, 3) having a common axis, each cylinder element being provided with a piston (28) reciprocable between first and second locations in the cylinder element the first and second locations respectively representing compression and expansion elements of the piston stroke, each piston having a forward side and a rear side; a combustion chamber (38) for each cylinder element comprising the forward side of the piston (28) and the walls (2) of the cylinder element; combustible gas compression means (37b, 37c) for each combustion chamber; supply passage means (41) arranged to deliver combustible gas to each combustible gas compression means; an induction chamber (37a) for each piston arranged to receive compressed combustible gas from the combustible gas compression means; transfer passage means (39) for directing compressed gas from each induction chamber to the respective combustion chamber, and cam means (13) rotatable about the common axis the c