Hall-Scott was founded in 1910 by Elbert J. Hall and Bert C. Scott, initially to produce powered passenger rail cars. Hall-Scott aero engine production also began in 1910.
Shortly after WW I, Hall-Scott dropped its aero engine and rail car product lines. The firm produced several hundred thousand two-speed rear axles for the Model T, the "Ruckstell Axle", through the mid-1920s. American Car and Foundry purchased Hall-Scott in 1925 and used its engines in its buses and boats.
In 1931, one of the firm's most famous and important products, the Invader, a marine engine, entered production. The company attained its highest production and employment numbers in World War II, building engines for a variety of military boats and a tank retriever. Hall-Scott engines were used in some Higgins Boats, the LCVP. Some post WWII ACF-Brill busses used by Greyhound and Trailways, used Hall-Scott engines.
ACF divested itself of Hall-Scott in 1954, and the division was purchased by Hercules Motors in 1958.
The final products bearing the Hall-Scott name were produced by Hercules in the late 1960s.
- Hall-Scott A-2 (V-8 aero engine)
- Hall-Scott A-3 (V-8 aero engine)
- Hall-Scott A-5 (straight-6 aero engine, OHC)
- Hall-Scott L-6
- Hall-Scott A-7 (straight-4 aero engine, OHC)
- Hall-Scott 400 (straight-6, truck engine, OHC)
- Hall-Scott 440 (variant of the 400)
- Hall-Scott 590 (straight-6, truck & bus engine, OHC)
- Bradford, Francis & Ric Dias, "Hall-Scott; The Untold Story of a Great American Engine Maker" (SAE, Int'l: Warrendale, 2007)
- Dias, Ric. Hall Scott
- Gunston, Bill, World Encyclopaedia of Aero Engines (Patrick Stephens: Wellingborough, 1983), p.73
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