BMW M2B15
Encyclopedia
The BMW M2B15 was a portable industrial engine manufactured by BMW
BMW
Bayerische Motoren Werke AG is a German automobile, motorcycle and engine manufacturing company founded in 1916. It also owns and produces the Mini marque, and is the parent company of Rolls-Royce Motor Cars. BMW produces motorcycles under BMW Motorrad and Husqvarna brands...

 from 1919 to 1922. It was used by several German motorcycle manufacturers to power their motorcycles.

In accordance with the ideas developed by Max Friz
Max Friz
Max Friz was a German mechanical engineer specializing in engine design. He was the key contributor of engine design and innovation that led to the founding of Bayerische Motoren Werke AG in 1917.-Early life:...

, Martin Stolle developed a 500 cc side-valve flat twin
Flat engine
A flat engine is an internal combustion engine with multiple pistons that move in a horizontal plane. Typically, the layout has cylinders arranged in two banks on either side of a single crankshaft and is sometimes known as the boxer, or horizontally opposed engine. The concept was patented in 1896...

. This was referred to internally as the Type M2B15 and offered for sale officially as the "Bayernmotor". The engine was tried out by various motorcycle manufacturers. Starting in 1920, Victoria
Victoria (motorcycle)
Victoria was a bicycle manufacturer in Nürnberg, Germany that made motorcycles from about 1901 until 1966. It should not be confused with a lesser-known, unrelated Victoria Motorcycle Company in Glasgow, Scotland that made motorcycles between 1902 and 1928....

 of Nuremberg
Nuremberg
Nuremberg[p] is a city in the German state of Bavaria, in the administrative region of Middle Franconia. Situated on the Pegnitz river and the Rhine–Main–Danube Canal, it is located about north of Munich and is Franconia's largest city. The population is 505,664...

 began to use the "Bayernmotor", and other manufacturers such as SMW also fitted it.

Bayerische Flugzeugwerke used the M2B15 engine in their Helios motorcycle. BMW inherited the Helios when it was merged with BFW in 1922.
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