BMW Type 255
| File:BMW RS 500 Kompr, Bj. 1939.JPG | |
| Manufacturer | BMW Motorrad |
|---|---|
| Also called | Type 255 RS 500 |
| Production | 1935–1939[1] |
| Predecessor | BMW WR 750 |
| Class | Street racing |
| Engine | 492.6 cc (30.06 cu in) DOHC supercharged boxer twin with aluminium cylinders; magnesium engine block and supercharger casing[2] Fuel: gasoline-oil mix |
| Bore / stroke | 66 mm × 72 mm (2.6 in × 2.8 in)[1] |
| Top speed | c. 220 km/h (140 mph)[2] |
| Power | 60 hp (45 kW)[2] |
| Transmission | 4-speed, shaft drive[1] |
| Frame type | Tubular steel twin cradle |
| Suspension | Front: Oil-filled telescopic forks Rear: Rigid (1935–1936) Plunger (after 1936)[1] |
| Weight | 138 kg (304 lb)[2] (wet) |
BMW Type 255 Kompressor (also known as the 500 Kompressor, RS 255, RS255 and Type 255 RS 500) was a supercharged boxer twin race motorcycle from the 1930s. A BMW 255 Kompressor was ridden to victory by Georg Meier in the 1939 Isle of Man TT and the first win by a non-British competitor in the premier 500cc Senior TT class.[3] A similar BMW 255 Kompressor machine was auctioned in 2013 for US$480,000, the second-highest price ever paid at auction for a motorcycle.[4][5][6]
Supercharger
[edit | edit source]A Zoller sliding vane supercharger is bolted to the front of the DOHC engine, driven directly by the crankshaft, and is lubricated by castor oil added to the fuel.[1][2][7] It provided c. 15 psi (100 kPa).[1]
Records
[edit | edit source]The machine set a number of race records, including the first lap over 100 miles per hour (160 km/h) at a major event, when Georg Meier won the Belgian motorcycle Grand Prix in 1939, and Ernst Jakob Henne's capture of the motorcycle land-speed record in 1936 on a model with a streamlined fairing.[1]
Today
[edit | edit source]An example is on display at the BMW Museum in Munich.[8]
Further reading
[edit | edit source]- 1939 BMW "Kompressor" Tourist Trophy 1–2 Victory June, 2009 BMW press release via WebBikeWorld
- Extensive model information at Bonhams (prior to January, 2013 auction)
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References
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- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ The Nazi TT – Hitler's 1939 Propaganda Victory in the Isle of Man page 73-80 by Roger Willis Motobusiness (2009) Quine & Cubbon Ltd Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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External links
[edit | edit source]- Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
