Patent ID: 7654234

Claim:
A barrel internal combustion engine comprising: a drive shaft assembly including a central drive shaft and a cam plate extending therefrom; a one piece monoblock having a longitudinal central axis with a central longitudinal opening receiving the drive shaft, the one piece monoblock further defining: a plurality of combustion chambers each having an axis parallel to the central axis, the combustion chambers being defined in a circle concentric with the longitudinal axis, each combustion chamber having a generally cylindrical side wall, a first closed end and a second open end, an intake valve opening and an exhaust valve opening being defined in the first closed end of each combustion chamber; a coolant system including a plurality of coolant passages; a plurality of intake passages each in fluid communication with one of the intake valve openings; and a plurality of exhaust passages each in fluid communication with one of the exhaust valve openings; a plurality of piston assemblies each having a piston received in one of the combustion chambers, the piston assemblies being in mechanical communication with the cam plate of the drive shaft assembly; and a valvetrain including a plurality of intake valves and exhaust valves, each of the valves being received in one of the valve openings in the combustion chambers.