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Launched in 1957 the Model Twenty One was the first of the Triumph unit construction twin cylinder motorcycles from the Meriden factory. With a capacity of 349 cc, the engine was a classic Edward Turner design with a 360 degree crankshaft, twin gear driven camshafts and twin plunger oil pump. The cylinder block was cast iron with an alloy head ...
The AJS Model 31 was also produced as the Matchless G12 by the same company. [2] Designed by Phil Walker, AMC knew that it had to be a 650cc but wanted to use as many cycle parts as possible from the preceding 600cc Matchless G11, which had been badge-engineered as the AJS Model 30. The cylinders could not be bored out further, so the stroke ...
First Norton Twin Motorcycle, designed by Bert Hopwood Model 77: 497cc 1950–1952 A rigid framed version of the Model 7, supplied only to the Australian market. Model 77: 596cc 1957–1958 Built mainly for sidecar use Dominator 88: 497cc 1952–1966 Same engine as a model 7 but in a featherbed frame Dominator 99: 596cc 1956–1962 Nomad: 497cc ...
Although it was supposed to be the sports model of the Triumph range, the Tiger 110 was later fitted with the rear paneling that was introduced with Triumph's 350cc 3TA twin in 1957. This rear cowling earned it the nickname ' bathtub ' from its shape and made the T110 look somewhat staid.
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines.
The Classic used an air-cooled twin-rotor Wankel engine that had been developed by David Garside at BSA's Umberslade Hall research facility. [1] [2] [3] Garside, who had been impressed by the air-cooled single-rotor Fichtel & Sachs engine in the Hercules motorcycle, installed a bought-in F&S engine into a BSA B25 'Starfire' frame as a "proof of concept".
The original Triumph Bonneville was a 650 cc parallel-twin motorcycle manufactured by Triumph Engineering and later by Norton Villiers Triumph between 1959 and 1974. It was based on the company's Triumph Tiger T110 and was fitted with the Tiger's optional twin 1 3/16 in Amal monobloc carburettors as standard, along with that model's high-performance inlet camshaft.
The Matchless G12 was one of the last motorcycles designed under the Matchless name. It was also produced as the AJS Model 31 by the same company. [2] Designed by Phil Walker, AMC knew that it had to be a 650 cc (39.7 cu in) but wanted to use as many parts from the Model 11 as possible.