Abstract: A bent axis rotary piston engine which includes features improving its operational characteristics. The engine provides the capability of dual output power, improved cooling and gas flow through the engine, supercharging and improved scavenging of the exhaust. The engine also includes an oiling system, an improved bent axis piston design, and a rotary valve system provided by the pistons and cylinders. The engine is also adapted to incorporate auxiliary equipment such as a starter and magneto system, and an electrical power generator. Other features are disclosed.