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). 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 ex
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| - Sunbeam S7 et S8 (fr)
- Sunbeam S7 and S8 (en)
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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). 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 ex (en)
- Les Sunbeam S7 et S8 sont des motos britanniques conçues par et dont le style s'appuie vaguement sur celui de la BMW R 75, acquises comme réparations de guerre par BSA (les droits complets de la marque Sunbeam avaient été acquis d'AMC en 1943). Construites à Redditch, la configuration inhabituelle du moteur ressemblait à celle d’une voiture. Le moteur, un bicylindre vertical OHC de 500 cm3 monté longitudinalement, était basé sur un modèle expérimental BSA de 1932 (le Line-Ahead-Twin - LAT). Ce moteur avait un allumage par bobine et une lubrification par carter humide. L'embrayage à sec entraînait via un arbre d'entraînement la roue arrière. Le moteur en ligne rendait cela techniquement réalisable : les moteurs bicylindres opposés (« bicylindres à plat ») sur les motos BMW avaient déjà uti (fr)
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| - Les Sunbeam S7 et S8 sont des motos britanniques conçues par et dont le style s'appuie vaguement sur celui de la BMW R 75, acquises comme réparations de guerre par BSA (les droits complets de la marque Sunbeam avaient été acquis d'AMC en 1943). Construites à Redditch, la configuration inhabituelle du moteur ressemblait à celle d’une voiture. Le moteur, un bicylindre vertical OHC de 500 cm3 monté longitudinalement, était basé sur un modèle expérimental BSA de 1932 (le Line-Ahead-Twin - LAT). Ce moteur avait un allumage par bobine et une lubrification par carter humide. L'embrayage à sec entraînait via un arbre d'entraînement la roue arrière. Le moteur en ligne rendait cela techniquement réalisable : les moteurs bicylindres opposés (« bicylindres à plat ») sur les motos BMW avaient déjà utilisé des engrenages d’entraînement suivis du système utilisé par Nimbus en 1918. À sa sortie, la S7 était chère et trop complexe techniquement. Cela peut expliquer pourquoi elle est maintenant plus recherchée que les S7 De Luxe et la S8, qui ont été produites avec moins de fonctionnalités pour réduire les coûts, tout en conservant nombre de composants innovants de la Sunbeam d’origine et en actualisant certaines idées. (fr)
- 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). 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. (en)
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