The M2B33 engine in the R32 had a displacement of about 500 cc and had a cast-iron sidevalve cylinder/head unit.
This bike was with authentic named Helios.
After the merger, General Director of BMW (Bayerische Motoren Werke) Franz Josef Popp asked Design Director Max Friz to assess the Helios motorcycle. Upon completing his assessment, Friz suggested to Popp that the best thing that could be done with the Helios would be to dump it in the nearest lake!
More specifically, Friz condemned the Douglas-style transverse-crankshaft layout, which heavily restricted the cooling of the rear cylinder.
R32 engine and transmission unit
There were near-term solution of redesigning the Helios to make it more saleable and a long-term solution of an all new motorcycle design. This new design was designated the BMW R32 and began production in 1923, becoming the first motorcycle to be badged as a BMW.
The engine produced 8.5 hp 0 6.3 kW, which propelled the R32 to a top speed of 95 km/h (59 mph). The engine and gear box formed a single unit. The new engine featured a recirculating wet sump oiling system at a time when most motorcycle manufacturers used a total-loss oiling system.
BMW used this type modern of recirculating oiling system until 1969.
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