A stationary crankshaft, cylindrical rotor, low friction, adjustable timing, pistonless, rotary internal combustion engine. A cylindrical rotor rotates freely about a stator, also cylindrical in shape. A plurality of cavities are circumferentially disposed along the external circumference of the stator and the internal circumference of the rotor that, when rotationally aligned, form combustion chambers. Rotation of the rotor is induced by electrical-spark induced combustion of a fuel/air mixture in the combustion chambers. The combustive exhaust is vented into an exhaust manifold for transport to an exhaust disposal system, such as a catalytic converter. Cooling, fuel pressurization, and electrical generation can be internal to the engine or supplied externally. Engine speed, torque, and other operational requirements can be accommodated by coupling multiple rotational units together and engine vibration can be virtually eliminated by offsetting the combustion chambers on coupled units.