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The agreement between the two companies expired in 1907. Before that time, Thor did not make complete bikes and Indian used the Thor manufactured engines of Hedstrom's design. [7] After the split Thor began to innovate new features and this included the F-head engine, a V-twin engine, and automatic (aka mechanical) valves on the engine. [7]
The BSA Model E was the first of a series of successful V-twins [1] based around the reliable 770cc side valve engine with cylinders at an angle of 50 degrees. The modest 6hp produced by the engine was able to provide a top speed of 55mph and it had BSA's own design of three speed gearbox with the drive chain enclosed in an aluminium casing.
It was named "Powerplus" because its output of approximately 16 horsepower (12 kW) was noticeably greater than that of the earlier engine. [4] The new engine was installed in the existing frames for Indian V-twin motorcycles, and used existing drivetrain components, tanks, handlebars, and other components. [3]
Indian Scout. Model G-20. Designed by Charles B. Franklin, [1] [3] the Scout was introduced in October 1919 as a 1920 model. The Scout had a sidevalve V-twin engine with its transmission bolted to the engine casing, allowing a geared primary drive - the only American v-twin to use this maintenance-free system. [4]
In 1923 a Chapuis-Dornier engine replaced the DFP, but production of the new car and the old V twin model stopped in May. About 4000 cars of all types were made by GN in the post war period. A new company was founded by some ex-employees and a few more cars were made from parts in 1924 and 1925, but the main business was spares and service.
Early models used the 988 cc (60.3 cu in) J.A.P. sidevalve engine which was expected to be superseded by the overhead valve Brough Superior SS100 when it was introduced at the end of 1924, but SS80 sales continued well and in 1935 the SS80 was fitted with the 982 cc (59.9 cu in) Matchless V-twin engine, similar to the one fitted to the ...
The mainstay of Excelsior production through the 1910s and into the 1920s was the 61 cu in (1,000 cc) Model BigX. This had an inlet-over-exhaust v-twin engine, first with belt drive then with 2 speed and then 3 speed gearbox. Colors were grey with red panels in the early teens, the 'Military Model' of the late teens was in khaki (a green-brown ...
The design of the Super X was a considerable departure from its predecessors at Excelsior. Where earlier Excelsiors had an enclosed primary chain transmitting power from the engine to a separate gearbox, the Super X had the engine and transmission together in a single crankcase, using a helical gear to power the transmission directly from the engine.