Abstract: An oscillating air motor includes one or more cylinders that house a piston. The piston is connected to a crankshaft by a connecting rod. The cylinders are in fluid communication with a solenoid valve that supplies air to the cylinders. The air is forced into the cylinders at a predetermined time causing the piston to move down the cylinders. The cylinder are supported by at least a countershaft that passes through the cylinders. The cylinders are permitted to move about the countershaft. Movement of the cylinders about the countershaft may be used to control input and output valves of the motor. Alternatively, sensors activated by a cam on the camshaft may be used control input and output solenoid valves. Using a two way transfer valve, the engine may be switched to pump mode for regenerative braking.