DKW ARe 175
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The DKW ARe 175 and the ORe 250 were water-cooled racing machines from the DKW plants.
After DKW had decided to increase its presence in racing, two-stroke racing motorcycles with charge pumps and water cooling were developed from 1923 onwards. The types ARe 175 and ORe 250 with a single cylinder engine were created. The machines were launched for the first time in 1924.
In these models, both exhaust pipes were led off on the left and the carburetor was behind the cylinder, which was made as a bag cylinder in one piece from gray cast iron . Below the crankcase was the charging pump, which was driven by a crank pin offset by 180 degrees. The engines had dual ignition .
In 1926, in the course of further development, the cylinder was rotated 90 degrees so that the exhaust pipes were at the front and the carburettor was now attached to the side. The rotation of the cylinder also made a new crankcase necessary. A year later the engines got removable cylinder heads, the water spaces on the exhaust ducts were enlarged and the double ignition was dispensed with. These engines achieved a liter output of 45 hp / l, which rose to 70 hp / l in the early 1930s. In 1932 this corresponded to an engine output of almost 18 hp at 5300 rpm (with a displacement of 250 cm³). The power was transmitted from the engine to the transmission and from there to the rear wheel with an open chain.
Both motorcycles were successfully used in racing. DKW won the European championship in the 175 class in 1927 with Willi Henkelmann , in 1929 with Josef Klein and in 1930 with Yvan Goor . In the years 1927 and 1928 Walfried Winkler became German road master with the ORe . In 1926 Arthur Müller from Zschopau achieved an international record in the class up to 175 cm³ on the Berlin Avus on DKW ARe with an average of 106 km / h.
Technical specifications
| Vehicle type | ARe 175 | ORe 250 | |
|---|---|---|---|
| engine | Single cylinder two-stroke, with charge pump and water cooling ( thermosiphon ) | ||
| Displacement | 175 cc | 247 cc | |
| Bore × stroke | 59 × 64 mm | 68 × 68 mm | |
| power | 12 hp | 17 hp | |
| compression | 8.9: 1 | 8.5: 1 | |
| Charge pump bore × stroke | 80 × 17 mm | ||
| transmission | 3-speed manual gearbox ( Sturmey-Archer or Hurth ) | ||
| frame | Tubular frame | ||
| fork | Welded tubular fork with built-in shock and steering damper | ||
| wheelbase | 1275 mm | ||
| bikes | 26 ″ | ||
| length | 1960 mm | ||
| Saddle height | 700 mm | ||
| own weight | 83 kg | ||
| Top speed | approx. 120 km / h | approx. 140 km / h | |
swell
- Automobile and motorcycle chronicle, Schrader, Munich issue 11/1974
- Website of the DKW motorcycle club . Retrieved October 10, 2019.
literature
- Siegfried Rauch, Frank Rönicke (ed.): DKW - history of a world brand . Motorbuch-Verlag, Stuttgart 2007, ISBN 978-3-613-02815-9 .