The Sunbeam S7 and S8 are British motorcycles designed by Erling Poppe with styling loosely based on the BMW R71 designs that were acquired as war reparations by BSA.
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 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.
Source : Sunbeam - moto classique refroidie air (intervalles type)
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