The Stirling cycle engine module is a conventional single cylinder, twin-piston displacer-type engine, with the addition of a rotary valve/crankdisc which times and isolates the thermal phases of the cycle, so that effective thermal separation is maintained for maximum operating effectiveness. Multiple hot and cold conduction threaded rods are uniformly placed within the respective displacer zones for more effective heat transfer. A modular system is adopted of ganging individual engine modules ...