DKW RT 350
| DKW | |
|---|---|
_im_museum_mobile.JPG) DKW RT 350 S in the museum mobile |
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| DKW RT 350 | |
| Manufacturer | Auto Union, Ingolstadt |
| Production period | 1954 to 1956 |
| class | motorcycle |
| Motor data | |
| Two-cylinder two-stroke | |
| Displacement (cm³) | 348 |
| Power (kW / PS ) | 13.6 / 18.5 |
| Torque ( N m ) | 28 |
| Top speed ( km / h) | 115-120 |
| transmission | 4 courses |
| drive | Chain |
| Brakes | drums |
| Wheelbase (mm) | 1350 |
| Dimensions (L × W × H, mm): | 2080 × 660 × 970 |
| Seat height (cm) | 750 |
| Empty weight (kg) | 176 |
.JPG)
The DKW RT 350 was Auto Union's largest motorcycle in Ingolstadt . It was built from 1954 to 1956 - since 1955 as the DKW RT 350 S - after it was presented at the IFMA in Frankfurt in 1953 . After initially good demand, sales quickly fell, so that from 1955 to the end of production only 5290 pieces were made.
Engine and power transmission
The DKW RT 350 S had a two-stroke - Parallel Twin-motor with opposed pistons and reverse circulation , which was characterized by low vibrations and quietness. With an exhaust sound of 85 Phon , the engine was also quiet. The Bing - gasifier (Ø 26 mm) from the handlebar during cold starting to be actuated starter nozzle - without fuel swab and air slide - sat under a smooth-surfaced panel whose halves were held by each of a Phillips head screw. The interrupted cooling ribs ("spiked ribs"), which improved the cooling compared to the conventional form, were striking. Another special feature was the electrical system developed and manufactured in-house by Auto Union with two independently adjustable ignition interrupters and two ignition coils . The charge regulator was not attached to the alternator , as is generally the case , but in the right side box.
The engine with a displacement of 348 cm³ developed 18.5 hp (13.6 kW) at 5000 rpm and a compression of 1: 6.3-1: 6.5. According to the manufacturer, a higher performance could have been achieved, but not without greater wear and tear when using the motorcycle. A maximum torque of 2.85 mkp (27.9 Nm) at 3500 rpm and a correspondingly designed four-speed gearbox with dog clutch enabled an acceleration from zero to 80 km / h in 10 seconds in solo operation. The top speed was 120 km / h alone, 115 km / h with two people and 90 km / h with a sidecar. The standard consumption was stated as 3.8 l / 100 km (measured at three quarters of the maximum speed on a flat, dry road plus 10%). The motorcycle tester Ernst Leverkus named 5.2 liters for the solo machine and 7.4 l / 100 km as the highest consumption under extreme loads.
A duplex sleeve chain transmitted the power from the crankshaft to the foot-operated gearbox and a dust-proof encapsulated roller chain from there to the rear wheel. The multi-plate clutch ran in an oil bath. To make repairs easier or to adapt the gear ratio to sidecar operation, the transmission could be removed independently of the engine after removing the clutch.
Frame and chassis
The DKW RT 350 had a closed, welded tubular steel frame with a sidecar connection, a pneumatically damped telescopic fork with 140 mm spring travel and, in the first version, a straight-path rear suspension. As the RT 350 S, it received a rear swing arm with hydraulically damped spring struts in 1955 , with the S in the type designation indicating this version. The rear suspension travel was 100 mm. Depending on requirements, the rear suspension could be switched to “hard” or “soft” or to solo or sidecar operation.
The drums of the two full-hub brakes had a diameter of 180 mm. The front brake was operated mechanically with a cable, the rear and sidecar brakes hydraulically. Both wheels had quick-release axles to allow easy installation and removal.
Furnishing
The first version of the DKW RT 350 had an oscillating saddle, which was replaced in 1955 by the seat cushion that was also introduced in the smaller DKW models. A double bench seat was available on request and at an additional cost. The horn was integrated into the headlight.
Oil and gasoline were filled up separately on this two-stroke motorcycle and automatically mixed in a ratio of 1:25 with the help of a device built into the 17-liter tank. First the oil had to be filled in, then the gasoline.
Binder sidecar
.JPG)
The metal goods factory Reichertshofen built a sidecar by Karl Binder especially for DKW motorcycles, the design of the front and rear of which was adapted to the DKW car models. In order to get in easily, the upper part of the body had to be opened. In addition, this sidecar had a relatively large trunk. The track width of the combination with the third wheel braked was 110 cm, the curb weight 245 kg.
Technical specifications
| Parameter | DKW RT 350 S. |
|---|---|
| construction time | 1955-1956 |
| engine | Two-stroke parallel twin, reverse flush; Gray cast iron cylinder with removable light metal head |
| Displacement | 348 cc |
| Bore × stroke | 62 mm × 58 mm |
| compression | 1: 6.3-1: 6.5 |
| power | 18.5 hp (13.6 kW) at 5000 rpm |
| Carburetor | Bing angled jet starter carburetor, Ø 26 mm |
| alternator | 6 V 70/90 W. |
| transmission | 4-speed claw gear with foot switch |
| frame | Closed tubular steel frame, welded; Telescopic fork with pneumatic damping, rear swing arm with hydraulically damped spring struts |
| Brakes | Full-hub drum brakes, Ø 180 mm, hydraulically operated at the rear |
| overall length | 2080 mm |
| wheelbase | 1350 mm |
| Tires | 3.50–18 (front and back) |
| tank | approx. 17 liters |
| Standard consumption | 3.8 l / 100 km |
| Empty weight | 176 kg (with sidecar 245 kg) |
| Top speed | solo 120 km / h, with 2 people 115 km / h |
| price | 2250.00 DM |
Individual evidence
- ↑ a b c d data sheet DKW RT 350. Accessed on November 17, 2013
- ↑ a b c d e f sales brochure MB 1932 (200 J110 II)
- ^ Ernst Leverkus: The great motorcycles of the 50s . 8th edition, Motorbuch Verlag, Stuttgart 1993, ISBN 3-87943-849-8 , p. 53 u. 54.
- ↑ Binder sidecar. Accessed on November 18, 2013 (PDF; 5.4 MB)