DKW SS 350 – year 1939
Manufacturer: Auto Union AG, Zschopau / Saxony, Germany.
The SS racing vehicle is certainly one of the structurally successful sports bikes 350 by DKW.
The DKW type SS350 had a two-cylinder, supercharged four-piston engine (the so-called. U-engine). Two of the four pistons of the power unit worked in the working cylinders, with displacement 348 cm3, and the other two were pistons of superchargers, each of which, as well as two Amal drop carburetors, it worked separately for each combustion chamber. The intake throats of both carburetors were covered with an aerodynamic cover, to prevent foreign objects or water from entering the engine. The spark plug is located in the flywheel, it was also tightly sealed. The engine power was 22 kW (30 KM) at 5000 rpm. The engine was locked to a four-speed gearbox. The drive from the crankshaft to the clutch was transmitted by a duplex chain, lubricated with oil and placed in a special cover. The motorcycle had a welded tubular steel frame. In addition to the unusual engine, a novelty was also the patented rear wheel suspension system.
Front suspension, racing type, had two shock absorbers. Large drum brakes acted on both wheels. The racing style of this model was also reflected in the duralumin steering wheel grips placed on rubber silent blocks. (adjustable), footrests, flexibly mounted fuel tank (with emergency valve, that cuts off the fuel supply quickly), lightened saddle, specially shaped exhaust pipe with racing funnel” (that is, resonator) e.t.c. For universal adaptation of the motorcycle – for road or mountain racing – the rear wheel hub was equipped with two sprockets with a different number of teeth, enabling the selection of the most convenient gear. Large fuel tank (since consumption was approximately 10-18 liters / 100 km) housed 20 liters of gasoline. The weight of the motorcycle was 125 kg.