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The Sunbeam S7 and S8 are British motorcycles designed by Erling Poppe with styling loosely based on the BMW R75 designs that were acquired as war reparations by BSA (full rights to the Sunbeam brand had been acquired from AMC in 1943).[1]
Built in Redditch, the unusual engine layout was similar to that of a car. The engine was a longitudinally mounted inline vertical OHC 500 cc twin based on an experimental 1932 BSA design (the Line-Ahead-Twin - LAT) with coil ignition and wet sump lubrication which, through a dry clutch, drove a shaft drive to the rear wheel. The inline engine made this technologically feasible—horizontally-opposed ("flat") twin engines on BMW motorcycles had already used shaft drives following the system employed by the four cylinder Nimbus since 1918. The early S7 was expensive and over engineered, which is why it is now the most sought-after and commands a premium over the S7 De Luxe and the S8, which were produced with fewer features to reduce costs, while retaining many of the innovative parts of the early Sunbeam and updating some ideas.
^Kemp, Andrew (2001). Classic British Bikes. Bookmart Ltd. pp. 124–125. ISBN 978-1-86147-058-4.
The SunbeamS7andS8 are British motorcycles designed by Erling Poppe with styling loosely based on the BMW R75 designs that were acquired as war reparations...
bought Sunbeam in 1943. Sunbeam Cycles is most famous for its S7 balloon-tyred shaft-drive motorcycle with an overhead valve in-line twin engine. Sunbeam Cycles...
the United Kingdom SunbeamS7andS8 Sunbeamland Chancery Division. The Times, Tuesday, 4 July 1916; pg. 3; Issue 41210 Ian Nickols and Kent Karslake, Motoring...
Yamaha TDM900 Yamaha XS650 Yamaha YZF-R3 SunbeamS7andS8 The Tandem Twin is where the cylinders are longitudinal, and have two cranks geared together. A tandem...
V-twin engine in 1923 and the Silent Three using a 350 cc Barr and Stroud sleeve-valve engine. Poppe designed the SunbeamS7andS8 motorcycles based on...
The table lists the IATA airline designators, the ICAO airline designators and the airline call signs (telephony designator). Historical assignments are...
zinc. They were made entirely at the Evansville Chrysler (EC) and Evansville Chrysler Sunbeam (ECS) ammunition plant in Evansville, Indiana. T2AAA = 2,000...
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