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The Porsche 917 is a sports prototype race car developed by German manufacturer Porsche to exploit the regulations regarding the construction of 5-litre sports cars. Powered by a Type 912 flat-12 engine which was progressively enlarged from 4.5 to 5.0 litres, the 917 was introduced in 1969 and initially proved unwieldy on the race track but continuous development improved the handling and it ...
The 917 instability problem was resolved with a revised rear hatch, which was called 917K (Kurzheck). There was a long tail version known as the 917LH (Langheck). Towards the end of the 1970 season, Ferrari entered some races with a new version of the 512, the 512M which had a revised bodywork
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The further evolution of the 917, the 917/30 with revised aerodynamics, a longer wheelbase and an even stronger 5.4-liter engine with around 1,100 horsepower (820 kW) in race trim, won the 1973 edition winning all races but two when Charlie Kemp won the Mosport race and George Follmer won Road Atlanta and Mark Donohue won the rest.
For 1969, the Group 6 prototype rules were changed, and Porsche lowered the weight of the Porsche 908/02 spyder [1] by 100 kg (220 lb), removing the roof and the long tails. Aluminium tube frames were used, with air pressure gauges to check them. The 1969 24 Hours of Daytona was a disaster for Porsche, as all three 908/02 failed, while a Lola ...
Porsche 917 experimental Can-Am engine. A flat-sixteen engine, also known as a horizontally opposed-sixteen, is a sixteen-cylinder piston engine with eight cylinders on each side of a central crankshaft. Flat-sixteen engines are less common than V16 engines, with only a couple of prototype racing engines using a flat-sixteen layout.
The Porsche 917 long tail, used from 1969 to 1971, had reached 362 km/h (225 mph). [3] After engine size was limited, the top speed dropped until powerful turbo engines were allowed, like in the 1978 Porsche 935, which was clocked at 367 km/h (228 mph). [4]
The design paradigm of sloping the tail to reduce drag was carried to an extreme on cars such as the Cunningham C-5R, [14] resulting in an airfoil effect lifting the rear of the car at speed and so running the risk of instability or loss of control. The Kammback decreased the area of the lifting surface while creating a low-pressure zone ...