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1955 Mercedes-Benz 300 SL Alloy Gullwing W198-I
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no. 29 manufactured, 19th built. no. 29 manufactured, 19th built
Whilst Mercedes-Benz initially had no plans for series production of its racing (W194) 300 SL, its U.S. importer, Max Hoffman, had other ideas. Hoffman, a master marketer and a man of great insight, persuaded Daimler-Benz AG to offer a production model by ordering 1,000 of them to be sold in the United States. The idea was of a toned-down Grand Prix car, tailored to performance enthusiasts in the booming post-war American market. The new (W198) 300 SL, introduced at the 1954 New York Auto Show rather than the usual Frankfurt or Geneva shows, was both a grand tourer and the fastest production car of its days. This is the first of all the SL Mercedes Benz, where SL stands for Sport Leicht (Sport Light). It was built around an innovative aluminum tube spaceframe chassis, designed by engineer Rudolf Uhlenhaut, that saved weight while providing a high level of strength. Since it enveloped the passenger compartment, traditional doors were impossible, giving birth to the model's distinctive gull-wing arrangement. After a handful of early production models were made in alloy, as the competition cars were, the new Karl Wilfert and Friederich Geiger-designed body was largely steel, retaining aluminum doors, hood, and boot lids, and included the bumpers (with over-riders for U.S.-spec cars) and numerous comforts, including a tilt-wheel for ease of entry and featuring a sumptuous interior that is a requisite for Mercedes-Benz owners road use. Only 29 cars had an aluminum body designed for competitions, which for the 300 SL W198 were reserved for private drivers. For the engineering, the designers had to fight a lot to combine innovative ideas and performance needs with the difficult situation of German car builders right after the war, due to the rules and to economic conditions. A Bosch mechanical Fuel Injection replaced the race car’s carburetors: the unit, derived from the one used on the Messerschmitt fighter of World War II, on suggestion by Hans Scherenberg, a Daimler-Benz Avio engineer, raised the power output and would be the first for a production car. Like the W194, anyway, the W198 borrowed its 3.0 litre OHC straight-6 largely from the four-door 300 (W189), the famed "Adenauer" luxury tourer. Featuring an innovative aluminum head, with dry-sump lubrication, the engine was inclined to the side in order to reduce the height of the front end. The power, rated at 215 brake horsepower at 5,800 rpm (DIN) with the factory-optional or dealer-installed “sport” camshaft, was delivered through a four-speed manual gearbox. A 161 mph top speed and 0–60 acceleration of approximately eight seconds, depending upon the rear-end ratio selected from five options, made the 300 SL the fastest production automobile of its time. Aerodynamics played an important role in the car's speed, with Mercedes-Benz engineers placing horizontal "eyebrows" over the wheel openings to reduce drag. At high speed the car wasn’t easy to manage with the series-derived swing-axle rear suspension, nevertheless the W198 was an absolute winner when raced, beginning with the 1955 Mille Miglia, where was winner in class. With the 300SL, Daimler-Benz AG reaffirmed its prestige in those areas that had made it famous in the pre-war period, namely the class and elegance of its cars, but also their weight in sporting competition. Immediately successful and today iconic, when production ended after the 1957 model year, Hoffman’s original request for 1,000 cars was exceeded, as the production reached just 1,400 units. More than 80% of the vehicle's total production were sold in the U.S., making the Gullwing the first Mercedes-Benz widely successful outside its home market. In 1957 the 300SL began a new life as a roadster (W198 II), but this is another story.
Created to stay competitive in sports car racing, the 300 SL Alloy was made available by the factory upon special order soon after Gullwing production began. Of the 1400 coupes produced, only twenty-nine were built in the alloy body configuration, just 2% of the production. After the cancellation of the 300SLR program in late-1955, the Alloy Gullwings became the only remaining competition variant of the 300SL.
The weight reduction of 200 lbs meant the alloy cars had a clear advantage on the race track.
All of the windows, with the exception of the safety windshield, were made from perspex. This lighter body weight, in combination with slightly shorter competition springs and stiffer shock absorbers, allowed the car to have a lower center of gravity and roll center. Additional features included a sport camshaft, and knock-off wheels.
Chassis N° 198.043.5500486 is the 19th of 29 Alloy Gullwing. Its racing debut was at the august 1955 Stella Alpina race with its owner-driver, the italian Alberico Cacciari. With Cacciari at the wheel, the car participated to two Mille Miglia in 1956 and 1957 and had an intense career up to 1960 on various tracks. It was often on the Monza Circuit, in northern Italy and Austrian events. In recent years, it was shown at the main Concours d'Elegance, achieving several trophies.