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Variants included the use of 4 valve heads, twin spark plugs and early electronic ignition systems. Some were modified to run as alcohol fuelled engines primarily for speedway use. All the engines were 4 stroke. Use of the engine declined in the 1970s as competing engines from Jawa-CZ and Weslake were developed giving better performance. [18]
Motorcycle speedway, usually referred to simply as speedway, is a motorcycle sport involving four and sometimes up to six riders competing over four anti-clockwise laps of an oval circuit. The motorcycles are specialist machines that use only one gear and have no brakes .
ESO was founded by a motorcycle racing driver Jaroslav Simandl, and made bikes in 250, 350, and 500 cc, primarily for speedway, moto-cross and ice racing. [1] [2] Engines were sourced from J.A.P. during the first year, and then an engine of ESO's own after 1950, first copied from J.A.P. and later of their own design. [3]
The Crocker Motorcycle Company is an American manufacturer, based in Los Angeles, California, founded by Albert Crocker.Located at 1346 Venice Blvd, Crocker produced a series of kits and whole motorcycles between 1931 and 1941: an overhead-valve conversion kit for the Indian 101 Scout motor (1932), a single-cylinder speedway racer (1934), powerful V-twin road motorcycles (1936–40), and the ...
In 1964 sportsmans were born, they were basically cut down versions of cars from the era, using side-valve Ford engines and steel bodies. Super Modifieds began in the 1970s, which used V8 engines such as the 283 cu in (4,640 cc) Chevy and 272 cu in (4,460 cc) Customline engines. This division soon turned into sprintcars in the mid 70's.
The "Offy" engine was derived from this Miller marine engine An Offenhauser sprint "midget" racer. The Offenhauser engine, familiarly known as the "Offy", was an overhead cam monoblock 4-stroke internal combustion engine developed by Fred Offenhauser and Harry Arminius Miller. [4] Originally, it was sold as a marine engine.