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Mercedes Benz 710 SSK


Mercedes Benz 710 SSK 27/240/300 hp Trossi Roadster

TIn the years before the first world war raged over Europe, Mercedes had established itself as a leading racing car manufacturer; in 1914 a Mercedes won the French Grand Prix and a year later a similar car took a victory in the Indy 500. Despite the grim financial situation in Germany after the war, Mercedes was keen to take up racing once again. To cut costs the competition cars of the early 1920s shared many parts with the contemporary road cars and with the earlier racers. During the war the Stuttgart based company had learned valuable lessons in the then novel idea of forced induction thanks to the production of airplane engines. By 1922 the Roots-type supercharger had become standard equipment on Mercedes' racing cars.


Mercedes Benz 710 SSK 27/170/225 hp Murphy Roadster

With the arrival of the talented Austrian designer Ferdinand Porsche the successes returned starting with a win in the 1924 Targa Florio. Porsche's first clean sheet design was built to the two-litre Grand Prix regulations and featured a twin-cam eight cylinder engine. It was quickly left obsolete as the rules changed at the end of the 1925 season. The young Austrian's next task was to design a new supercharged engine for a new range of luxury models launched late in 1924. Dubbed the 400 and 630, the two new machines were equipped with six cylinder engines of 4 and 6.3 litre displacement respectively. Both engines were fitted with an engageable supercharger, which only worked when the acceleration pedal was fully depressed. This was a compromise to have the power available when really needed and still minimize the stress on the engine.


Mercedes Benz 710 SSK 27/170/225 hp Rennwagen

Within a year, Porsche had reworked the 630 into a racing car with a similar engine, but with a shorter chassis. After the new chassis dimensions, the new racer was named K for Kurz or Short. After the merger with Benz in 1926, a completely new chassis was developed for the potent engine. It was significantly lower than the original K chassis to increase the handling characteristics of the heavy machine. Again for obvious reasons this new car was known as the S for Sport. To further improve the performance the engine displacement was increased to 6.7 litres, yielding 225 bhp with the 'Elephant' supercharger engaged and enough torque to move a house. The six cylinder engine now also sported a cylinder block constructed of silumin; a very light and strong alloy of aluminium and silicon. Rudolph Caracciola showcased the 'White Elephant's' capabilities with a convincing victory at the opening race of the Nurburgring in 1927.

For the 1928 season an even larger version of the engine was developed by increasing the bore to a staggering 150 mm, resulting in a displacement of 7069 cc. This model received the nameplate SS and like its predecessors was available as a complete cycle fender racing car or as a rolling chassis for coachbuilders to body. Caracciola continued his Nurburgring form by winning the German Grand Prix for sports cars on the legendary track with the new SS. Later in the year a shorter version was introduced especially for the popular hillclimb races; the SSK. Both cars were campaigned in the following years with considerable success in a wide variety of events. With a special lightweight version of the SSK, Caracciola scored the White Elephants' biggest success by winning the 1931 Mille Miglia. He was the first non-Italian to win the 1000 mile road race and did so in a record braking pace of 101.1 km/h.

The advent of a new generation of lighter sportscars left the heavy SSK obsolete by 1930.

 

General specifications
Country of origin Germany
Produced in 1931
Numbers built one-off (31 SSKs in total)
Body design Count Carlo Felici Trossi / Willie White
Weight 1982 kilo / 4369.6 lbs
Drivetrain
Engine M06 RS Straight 6
Engine Location Front , longitudinally mounted
Displacement 7.069 liter / 431.4 cu in
Valvetrain 2 valves / cylinder, SOHC
Fuel feed 2 Mercedes Updraft Carburetors
Aspiration Roots-Type Supercharger
Gearbox 4 speed manual
Drive Rear wheel drive
Performance figures
Power 300 bhp / 224 KW @ 3400 rpm
Torque 689 Nm / 508 ft lbs @ 2000 rpm
BHP/Liter 42 bhp / liter
Power to weight ratio 0.15 bhp / kg
Top Speed 235 km/h / 146 mph