The Porsche 936 is a Group 6 sports prototype racing car introduced in 1975 by Porsche as a delayed successor to the 917, a five-litre Group 5 Sports Car, and the 908, a three-litre Group 6 Prototype-Sports Car, both of which were retired by the factory after 1971. Its name came from using a variant of the Porsche 930's turbocharged engine, as well as competing in Group 6 racing. History The Porsche 936 was built to compete in the World Sportscar Championship as well as at 1976 24 Hours of Le Mans under the Group 6 formula, which it won both of. Chassis 002 with #20 won with Jacky Ickx and Gijs van Lennep won Le Mans, while the #18 chassis 001 of Reinhold Joest and Jürgen Barth had engine failure. It shared these victories with its production-based sibling, the Porsche 935 which won in Group 5. The open top, two seater spyder was powered by an air-cooled, two-valve single-turbocharger flat-6 engine with 2140 cc, or the equivalent of 3000 cc including the 1.4 handicap factor. The spaceframe chassis was based on the 917, with many of the parts also coming from that car. In the first outings, the Martini Racing car was still black, and the engine cover behind the roll bar was flat. The large hump and the air box above the engine was fitted onto the car later in the season. It is not for the air intake of the turbocharged engine, nor for cooling of the air-cooled engine itself, but instead mainly used for the intercooler. From 1976 to 1981, the factory entered Porsche 936 won the 24 Hours of Le Mans three times with Jacky Ickx ('76, '77, '81), thus each of the three original chassis won once. In 1978, the two previously winning chassis, one of which (the 936/78) had been given a developed version of the 935 engine came second and third behind the Renault, while the pole-setting new chassis 003 crashed out. Porsche did not intend to sell the 936 to customers, wanting them instead to use the 935 (which occupied the first four places at Le Mans in 1979), and the old 908 which were still around, updated to turbo engines and new 936-like aerodynamics. In 1979, a half-hearted Essex-sponsored Le Mans entry with two 936 was a failure, and the car also crashed at Silverstone. For 1981, Porsche was planning