This 400cc flat twin was designed by Granville Bradshaw for ABC (All British (Engine) Company.. It was in production from 1919 till 1925 but was expensive and did not sell well.
The similar-layout BMW R32 was introduced in the early 20s and though BMW has been accused of copying this engine layout, in fact the BMW engine was reverse engineered from a 1914 Douglas fore and aft twin and originally produced as a portable utility engine. BMW later adapted their motor for their first motorcycle, mounted crankshaft longitudinally in the the frame and logically, added shaft drive.
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Erfunden wurde der Boxermotor von Carl Benz 1896. Benz nannte ihn „Contra-Motor“, da sich die beiden Zylinder gegenüberlagen, und baute ihn erstmals 1897 in das Modell „Dos à Dos“ (französisch: Rücken an Rücken) der Benz & Cie. Rheinische Gasmotorenfabrik ein
Check out the BFw Helios motorcycle. Original M2B15 motor, longitudinally mounted.
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