Porsche 909 Bergspyder

Porsche 909 Spyder Mountain in the new Porsche Museum (2009)

The Porsche 909 was a racing car Bergspyder of Porsche KG, in 1968, developed specifically for the European Hill Climb Championship. The very light and manufactured in two copies, Porsche 's aim, according to 1966 and 1967 to win for the third time in a row the championship.

The 909 Bergspyder was only used in two heats. However, Porsche reached the goal and was able to celebrate with Gerhard Mitter, who drove a Porsche 910 Bergsypder in the race, the European Hill Climb Championship overall win in 1968.

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Development

Porsche began under the leadership of then development director Ferdinand Piëch with the development of the 909, as the Porsche used in the previous year was 910 Bergsypder very difficult to drive through continuous modifications and the main rival Ferrari announced a new racing car for the European Hill Climb Championship racing season 1968.

From the Porsche 909 only two vehicles were produced.

Vehicle characteristics

Body

The body of the 909 corresponded largely to the construction of the 910 Bergsypders. This was screwed in plastic and with the lightweight aluminum space frame. The open driver's cockpit was designed two seats and two small doors accessible from the left and right side of the vehicle.

The bow and stern were taken in each case as a complete unit from the trellis frame. The bug was in the right and left two small disks around the air pressure during the drive to raise the front axle. At the rear were two movable flaps, which were controlled by the wheel suspension at the upper outer edges.

The engine was placed far into the center of the vehicle and installed to achieve the transmission from the rear axle between the engine and locking differential to a neutral driving behavior as possible. Through the motor assembly of the driver's seat had to be mounted almost over the front axle.

By consistently designed for lightweight body and vehicle components, the 909 Bergsypder 430 kg empty weight (375 kg dry weight) was extremely easy. To achieve this, the developer used a partially unusual materials and technology. So no conventional fuel tank with fuel pump, but a very light 15 liters of petrol recapitulative accumulator of titanium was used. Instead of copper lines lighter lines of silver were used for the ignition system and the resistors were mounted on lightweight balsa wood.

Landing gear

The race car had an independent suspension with wishbones front and rear and Längszugstreben front and rear longitudinal thrust struts. As the vehicle's suspension all round coil springs were used with hydraulic telescopic shock absorbers. In order to keep the curb weight low, Porsche put the front springs from titanium. The brakes worked hydraulically. The brake discs were available in two versions. In addition to steel brake discs and brake discs have been used from the very light beryllium. Since the beryllium discs were very expensive to manufacture, only a vehicle was equipped.

For optimal power transmission to the road ensured wide wheels on the two axes. The 13-inch light-alloy cast wheels were wide on the front axle 8 inches and 13 inches at the rear axle. Then tires were in the dimensions 4.75/10.00-13 front and rear mounted 6.00/12.00-13.

Engine and transmission

In 909 Bergsypder Porsche built an air-cooled eight-cylinder boxer engine with a 2 liter engine of the type 771. This engine was already used in the Porsche 910 Bergsypder and tested for racing. In 909 the engine developed at 9000/min maximum 202 kW ( 275 hp) and therefore around 3.7 kW ( 5 hp) more power than the 910 This power increase resulted from the increase in the speed limit to 200 rpm and an increase in compression from 10.4: 1 to 10.5: 1

As fuel storage and supply used Porsche from a light weight set up 15 -liter pressure reservoir made ​​of titanium. The titanium ball tank contained within a rubber bladder that was set before the start with 10 bar pressure and made during the race for the pressure in the fuel system. In practice, the accumulator proved not optimal for use with the motor as.

Together with the five-speed manual transmission reached the racing car a top speed of about 250 km / h To reduce the slippage of the rear wheels, a multi-disc locking differential has been incorporated.

Racing history

With the Porsche 909 Bergsypder 1968 competed in the race car class in the European Hill Climb Championship. Because of the short time development of the car could not be tested. The two Porsche works driver Gerhard Mitter and Rolf Stommelen drove in the training of the two races on the Gaisberg mountain and Mont Ventoux the new Bergsypder. While Mitter for the older but proven Porsche 910 decided Bergspyder, Stommelen started the race with the 909

In both races, won the subsequent championship winner Gerhard Mitter. Rolf Stommelen came because of engine problems on the Gaisberg to a third place at the Mont Ventoux on the second rank.

After the two races of the Porsche 909 was Bergspyder no longer used. However, he later served as a model for the development of the Porsche 908/ 03.

Specifications

The Porsche 909 was introduced in 1968 produced and used in the following version:

Porsche Museum, Stuttgart Car classification Aluminium Hillclimbing Axle track Porsche 991 Porsche 550 Porsche 901 Porsche 904 Porsche 930 Porsche 993 Porsche 996 Porsche 997 Porsche 912 Porsche 924 Porsche 928 Porsche 944 Porsche 959 Porsche 968 Porsche 919 Hybrid Porsche 718 Porsche 787 Porsche 804 Porsche 906 Porsche 907 Porsche 934 Porsche 935 Porsche 936 Porsche 956 Porsche 961 Porsche 962 Porsche RS Spyder Porsche 597 Porsche 989 Porsche Panamericana
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