The American Simplex was an American

automobile A car, or an automobile, is a motor vehicle with wheels. Most definitions of cars state that they run primarily on roads, Car seat, seat one to eight people, have four wheels, and mainly transport private transport#Personal transport, peopl ...

manufactured in

Mishawaka, Indiana Mishawaka () is a city on the St. Joseph River (Lake Michigan), St. Joseph River, in St. Joseph County, Indiana, United States. The population was 51,063 as of the 2020 United States census, 2020 census. Its nickname is "the Princess City". Misha ...

, from 1906 to 1915 by the Simplex Motor Car Company; the company shortened its product's name to Amplex in 1910 to avoid confusion with the better-known, New York-based Simplex car, made by the Simplex Automobile Company. This change also coincided with a reorganization of the company. Originally the company manufactured a

two-stroke A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft in contrast to a four-stroke engine which re ...

four-cylinder The engine configuration describes the fundamental operating principles by which internal combustion engines are categorized. Piston engines are often categorized by their cylinder layout, valves and camshafts. Wankel engines are often categoriz ...

50 hp at 900 rpm from 6435 cc with 127 mm bore and 127 mm, later upsized to 6.8 liters and still rated at 50 hp. The top speed was 97 km/h (60 Miles per Hour). The wheelbase was 117 inches = 2972 mm. The gasoline tank held 20 gallons = 76 liters. In 1910, three open-roof models and two enclosed models were offered, costing up to $5,400; the newly introduced 30/50 hp Toy Tonneau, a long, sleek four-door touring car, sold for $4,300. The Amplex's most distinctive feature was its valveless motor, which the company claimed would offer more continuous pulling power and greater reliability. The 1910 models also offered self-starting, a feature that would not be available from major competitors, such as Cadillac, for another year or two.Floyd Clymer, Historical Motor Scrapbook Number Four, (1952), p.80 They were expensive cars, a limousine being offered at as much as $5,600. Yet the firm kept using the two-stroke engine after it had become obsolete; a four-stroke was offered unsuccessfully in 1913. Gillette Motor Co took over the Amplex manufacturing facilities in 1916, but refused to manufacture conventional engine-valving, persisting with a rotary

sleeve valve The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve. Sleeve valve engines saw use in a number of pre–World War II luxury cars and in the United States in the Willys-Knight car and light tru ...

engine.

References

Cars introduced in 1906 Motor vehicle manufacturers based in Indiana Defunct motor vehicle manufacturers of the United States Defunct companies based in Indiana Vehicle manufacturing companies established in 1906 Vehicle manufacturing companies disestablished in 1916 1910s cars 1916 disestablishments in Indiana 1906 establishments in Indiana Cars discontinued in 1915 {{Brass-auto-stub