The Murray engine is the earliest American supercharged engine still in existence. In 1911, Joseph J. Murray began design of air-cooled, valveless, 2-stroke, supercharged rotary engines, with the first model tested early in 1912. The engines were developed by the Murray-Willat Company, and built by the American Motors and Aviation Company, where Murray briefly served as Secretary-Treasurer. Murray engines were built through 1914.
This model followed the earlier 18.6 kW (25-hp) and 52 kW (70-hp) engines, and used an improved vane-type supercharger. It was built by the American Motors and Aviation Company, where Murray briefly served as Secretary-Treasurer. The artifact is mounted on its original metal test stand.
Gift of Miss Vera C. Murray.
Country of Origin: United States of America
Diameter 66 cm (25.98 in.)
Type: Rotary, 6 cylinders, air-cooled, 2-stroke, supercharged
Power rating: 22.4 kW (30 hp) at 1,200 rpm
Displacement: 2.4 L (146 cu. in.)
Bore and Stroke: 75 mm (2.95 in) x 90 mm (3.54 in)
Weight: 60 kg (132.3 lb)