BMW M2 B15 | |
---|---|
Overview | |
Manufacturer | BMW |
Also called | Bayern-Kleinmotor,
[1] Bayern Motor [2] |
Production | 1920–1923 [3] |
Layout | |
Configuration | flat-twin [4] |
Displacement | 494 cc (30.1 cu in) |
Cylinder bore | 68 mm (2.7 in) [4] |
Piston stroke | 68 mm (2.7 in) [4] |
Cylinder block material | cast iron [4] |
Cylinder head material | cast iron, in unit with block [4] |
Valvetrain | side-valve pushrod engine [4] |
Combustion | |
Fuel system | BMW carburettor [1] |
Fuel type | petrol |
Oil system | wet sump [1] |
Cooling system | air-cooled |
Output | |
Power output | 6.5 hp (4.8 kW) [2] |
Dimensions | |
Dry weight | 31 kg (68 lb) [1] |
The BMW M2B15 was BMW's first flat-twin engine. [3] Manufactured from 1920 to 1923, the M2B15 was intended to be a portable industrial engine, [2] but it was used by several German motorcycle manufacturers to power their motorcycles. [5]
In 1920, BMW engineer Max Friz reverse-engineered the engine of foreman Martin Stolle's 1914 Douglas motorcycle and developed a similar 500 cc side-valve flat engine from it. [4] This was referred to internally as the Type M2B15 and offered for sale officially as the "Bayern Motor". [2] The engine was tried out by various motorcycle manufacturers. Starting in 1920, Victoria of Nuremberg used the engine [2] in their KR 1 motorcycle, [3] and other manufacturers such as SMW and Bison also fitted it. [5]
Bayerische Flugzeugwerke used the M2B15 engine in their Helios motorcycle. BMW inherited the Helios when it was merged with BFW in 1922. [2] [4]
Construction time: 1920 - 1923
Coincidentally, BMW was also interested in motorcycles and in 1920 its foreman, Martin Stolle, stripped down his 1914 Douglas 500cc flat twin. Friz set about copying it, with a few modifications, and the BMW M2 B15 engine was born.
The M2B15 was supplied to Victoria, Bison, SMW and SBD and other smaller companies.
BMW M2 B15 | |
---|---|
Overview | |
Manufacturer | BMW |
Also called | Bayern-Kleinmotor,
[1] Bayern Motor [2] |
Production | 1920–1923 [3] |
Layout | |
Configuration | flat-twin [4] |
Displacement | 494 cc (30.1 cu in) |
Cylinder bore | 68 mm (2.7 in) [4] |
Piston stroke | 68 mm (2.7 in) [4] |
Cylinder block material | cast iron [4] |
Cylinder head material | cast iron, in unit with block [4] |
Valvetrain | side-valve pushrod engine [4] |
Combustion | |
Fuel system | BMW carburettor [1] |
Fuel type | petrol |
Oil system | wet sump [1] |
Cooling system | air-cooled |
Output | |
Power output | 6.5 hp (4.8 kW) [2] |
Dimensions | |
Dry weight | 31 kg (68 lb) [1] |
The BMW M2B15 was BMW's first flat-twin engine. [3] Manufactured from 1920 to 1923, the M2B15 was intended to be a portable industrial engine, [2] but it was used by several German motorcycle manufacturers to power their motorcycles. [5]
In 1920, BMW engineer Max Friz reverse-engineered the engine of foreman Martin Stolle's 1914 Douglas motorcycle and developed a similar 500 cc side-valve flat engine from it. [4] This was referred to internally as the Type M2B15 and offered for sale officially as the "Bayern Motor". [2] The engine was tried out by various motorcycle manufacturers. Starting in 1920, Victoria of Nuremberg used the engine [2] in their KR 1 motorcycle, [3] and other manufacturers such as SMW and Bison also fitted it. [5]
Bayerische Flugzeugwerke used the M2B15 engine in their Helios motorcycle. BMW inherited the Helios when it was merged with BFW in 1922. [2] [4]
Construction time: 1920 - 1923
Coincidentally, BMW was also interested in motorcycles and in 1920 its foreman, Martin Stolle, stripped down his 1914 Douglas 500cc flat twin. Friz set about copying it, with a few modifications, and the BMW M2 B15 engine was born.
The M2B15 was supplied to Victoria, Bison, SMW and SBD and other smaller companies.