The Porsche 936 was a racing car introduced in 1976 by Porsche as a delayed successor to the Porsche 908, It was built to compete in the World Sports car 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. The open top, two-seater spyder was powered by an air-cooled, two-valve 540 hp (403kW) single-turbocharger flat-6 engine with 2140 cc. The space frame 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, which had been updated for 1977, 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.