Development
When the Porsche 956 was developed in late 1981, the intention of Porsche was to run the car in both the World Sportscar Championship and the North American IMSA GTP Championship. However IMSA GTP regulations differed from Group C and subsequently the 956 was banned in the US series on safety grounds as the driver's feet were ahead of the front axle center line.
To make the 956 eligible under the new IMSA regulations, Porsche extended the 956's wheelbase to move the front wheels ahead of the pedal box. A steel roll cage was also integrated into the new aluminium chassis. For an engine, the Porsche 934-derived Type-935 2.8L flat-6 was used with air cooling and a single Kühnle, Kopp und Kausch AG K36 turbocharger instead of the twin K27 turbochargers of the Group C 956, as twin-turbo systems were not allowed in IMSA's GTP class at the time.
The newer Andial built 3.2L fuel injected Flat-6 would be placed in the 962 by the middle of 1985 for IMSA GT, which made the car more competitive against Jaguar. However it would not be until 1986 that the 2.6L unit from the 956 was replaced in the World Sportscar Championship, using 2.8L, 3.0L, and 3.2L variants with dual turbochargers. The cars run under World Sportscar Championship regulations were designated as 962C to separate them from their IMSA GTP counterparts.. The 3.2L unit, which had been eligible under IMSA's Group 3 engine rules was banned in IMSA by 1987 In 1988, to counteract against the factory Nissans and the threat of withdrawal from Porsche teams, watercooled twin turbo Porsche engines would be allowed back but with 36 mm restrictors.
In total, Porsche would produce 91 962s between 1984 and 1991. 16 were officially used by the factory team, while 75 were sold to customers. Some 956s were rebuilt as 962s, with two being previously written off and four others simply rebuilt. Three 962s that were badly damaged were also rebuilt had been given a new chassis number due to the extensive reconstruction. Due to the high demand for 962 parts, some aluminium chassis were built by Fabcar in the United States before being shipped to Germany for completion. Derek Bell, a 5-time Le Mans winner, drove the 962 to 21 victories between 1984 and 1987, remarked that it was "a fabulous car, but considering how thorough (Norbert) Singer (the designer of the 962 and head of Porsche's motorsport division at the time) and the team were, it was really quite easy to drive."
Read more about this topic: Porsche 962
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