The 1982 24 Hours of Le Mans was the 50th Grand Prix of Endurance, which took place on 19 and 20 June 1982. It was also the fourth round of the 1982 World Endurance Championship. As well as a significant anniversary, this was a watershed year for Le Mans, with the highly anticipated advent of the FIA's Group C regulations, the essence of which was to allow an open engine formula but a minimum weight for safety and a proscribed fuel allocation.
Despite Rondeau leading the championship, the Porsche works team arrived as clear favourites with their new 956. Their top driver pairing were the 1981 winners Jacky Ickx and Derek Bell. The better fuel economy of the Cosworth-engined Rondeau and Ford gave them the lead in the early hours, but then serious vibration issues in that engine started afflicting most of the teams and by early evening, the Porsches were running 1–2, that they maintained throughout the night as the competition fell away.
By dawn, the Porsche special of Joest Racing was established in third, which they held until ninety minutes from the end when the engine packed up, stranding Bob Wollek out on the track. Ickx and Bell had moved into the lead soon after midnight and kept it for the rest of the race, winning by three laps over their team-mates Jochen Mass and Vern Schuppan. In a race of unusual attrition, only eighteen cars were classified from the original 55 starters
The win gave Ickx an unprecedented sixth outright victory, and Porsche had its most dominant race yet, sweeping the top five places, including a 1-2-3 for the works team.
Regulations This year saw the advent of the new Group C regulations – a formula essentially of open engine capacity but instead on weight and fuel consumption restrictions. The concept had been trialled by the Automobile Club de l'Ouest (ACO) in the 1975 race, based on ideas proposed by Belgian racing journalist, engineer and 1960 Le Mans winner Paul Frère. At the time it was derided by the press as the “fuel-economy race”.Clausager 1982, p.167-9Clarke 1997, p.10: Motorsport July 1975 But it would go some way to negate the predominance of the turbo engines, despite the x1.4 modifier to capacity. The two-seater cars would have a maximum amount of fuel available in a race so there had to be a trade-off between more power from bigger engines, the heavy fuel consumption of high-boost turbo engines and the fuel-efficiency of smaller, lighter cars. A minimum weight of 800 kg was put in to maintain structural safety and there were defined dimensions of 100 cm minimum height, maximum 200 cm width and 480 cm length. These dimensions mirrored those of the ACO's GTP regulations. There was also a compulsory 100x80 cm flat floor area required between the axles to try to limit the undertray "ground-effects" performance enhancements. Fuel tanks were a maximum of 100 litres capacity and no more than 25 fuel stops were allowed in the race for each car – a maximum of 2600 litres from the start.Armstrong 1982, p.149Spurring 2012, p.94Clausager 1982, p.190Clarke 1997, p.154 Motor Jun12 1982 The windscreen regulations were such that the drag effect would almost guarantee that any car would need to have a closed-bodyshell and not open-top.
Unlike other races in the championship run to a set distance, where teams could calculate their required fuel economy, the open-ended nature of Le Mans would require prudent fuel management. Going on the previous year's winning run by Jacky Ickx and Derek Bell of 4825 km (just under 3000 miles) using this year's maximum 2600 litres of fuel would require a fuel economy of 54 litres per 100 km. This was at odds with the IMSA regulations, that instead used a sliding weight-scale to balance engine capacity. This then precluded the Daytona and Sebring endurance rounds from the World Championship.Wimpffen 2008, p.56
With Group C taking over, it made the Group 6 and Le Mans GTP classes redundant. Group B would supersede the Group 4 and Group 5 GT classes.
Entries Whereas other races in the World Championship needed their fields bolstered by Group 6 cars “grandfathered” into the entry list, the Le Mans list had very strong support for the new Group C with 33 entries, coming from a wide variety of manufacturers and racing specialists. There were factory teams from Porsche, Ford, Lancia and Mazda; with racecar builders Lola, March and Rondeau bringing works cars. Finally a raft of small privateer specialists brought their own Group C designs. These amounted to 30 "works" entries, the most seen at Le Mans for many years.Spurring 2012, p.93
However, as an interim year, to complete the field the ACO accepted entries from IMSA in the GTX and GTO categories, and had limited spaces for the former FIA classes.
Class Large-engines >2.0L classes Medium-engines <2.0L classes Turboengines Group C 33 / 28 - 7 / 7 Group B 1 / 0 - 1 / 0 Group 6 S Sports - 6 / 3 3 / 2 Group 5 SP Special Production 5 / 4 2 / 2 6 / 5 Group 4 GTS Special GT 1 / 1 - 1 / 1 IMSA GTX 12 / 11 - 4 / 4 IMSA GTO 6 / 6 - 3 / 3 Total Entries 58 / 50 8 / 5 25 / 22 Note: The first number is the number of arrivals, the second the number who started.
Group C After the triumphant debut last year of its 2649cc turbo engine, Porsche immediately started on the development of its new Group C car: the Porsche 956 under its technical director Norbert Singer. The flat-six, four-valve engine had a combined air-cooled block, and water-cooled heads. For qualifying, at 1.2-bar boost, it would generate 615 bhp, wound down to 1.1-bar (580 bhp) for race-pace and fuel economy. The aluminium hull was Porsche's first monocoque chassis, and with assistance from Dornier, had its aerodynamics tested in a wind-tunnel. This led to the engine being tilted at an angle. Also the company's first ground-effect car, the langheck version generated over three times as much downforce as the Porsche 917 model from a decade earlier. A completely new 5-speed gearbox was installed, replacing the CanAm 4-speed 'box used the year before. The project took only 9 months and in March, test driver Jürgen Barth was doing track runs and its first outing was at the Silverstone round. The team was nervous on fuel consumption if the competition chose to push them to race to keep up.Spurring 2012, p.96-7Clarke 1997, p.157 Autosport Jun24 1982 The team had a computer in the pits and digital flow meters in the cars to give them an edge in calculating the fuel consumption.Clausager 1982, p.193 Three cars were ready just in time, run by new team manager Peter Falk. Jacky Ickx was back out of retirement and a full-time works driver again with Derek Bell as his co-driver. The second car had Jochen Mass and Vern Schuppan while the one-off third car had Barth, Hurley Haywood and Al Holbert.
Ford was the other bulk manufacturer to take on Porsche. The new C100 model (named as it would be 100 cm high) was based on an aluminium monocoque design from Len Bailey. The first chassis was built by Hesketh Engineering while Alain de Cadenet got two more made, debuting at Brands Hatch in 1981. The project was then transferred to Ford Deutschland, working with the German Zakspeed racing team. Ford had engaged with Cosworth, to develop the famous DFV 3-litre Formula 1 engine for the car. Two versions of the new DFL V8 came out: a 3.3-litre and a 540 bhp 3.96-litre model. It was the latter that was put into the C100. Two cars were entered with Manfred Winkelhock and Klaus Niedzwiedz in one of the De Cadenet chassis, while a new Zakspeed chassis (with design updates by Tony Southgate dropping 40 kg) was assigned to Marc Surer and Klaus Ludwig.Spurring 2012, p.99Clarke 1997, p.152 Autosport Jun12 1982
The fortunes of Le Mans local Jean Rondeau had taken a big upward turn, selling several vehicles to customers. This enabled development of a Group C ground-effect car, the M482, and embarking on a full WEC season. Until ready, the team adapted the existing design to Group C spec, as the M382. They had the best possible start, winning the opening round at Monza with an updated M379C car, and came into the race as the leader in the championship. For Le Mans, three of the M382s were prepared, fitted with the bigger Cosworth DFL: the race-winning chassis would be driven by François Migault, Gordon Spice and Xavier Lapeyre. The premier car had Henri Pescarolo and Jean-Pierre Jaussaud (with five wins between them) while the third car had Rondeau himself with rally-specialist Jean Ragnotti. There were also three customer Rondeaux; Christian Bussi had an M382 with a 3.3-litre DFL, while those of Pierre Yver and former team-driver Jacky Haran were older M379Cs with 3-litre DFV engines.Spurring 2012, p.104-5
The small WM team also looked at running a WEC campaign, under the Secateva racing team set up by WM driver Roger Dorchy. Peugeot further developed the PRV engine, now up to 2850cc and putting out 540 bhp. But the fuel consumption of the twin-turbo engine had proven problematic in the early races. The new P82 had the drivetrain lowered to improve the centre of gravity and handling and could get up to 350 kp/h (220 mph) . Unlike all the other Group C cars the WMs were significantly smaller than the maximum dimensions and so had a far smaller frontal area that gave them their higher speed. Two cars were entered, with Dorchy and Guy Fréquelin in one and Jean-Daniel Raulet and Didier Theys in the other.Spurring 2012, p.117Clarke 1997, p.158 Autosport Jun24 1982Armstrong 1982, p.154 Much like at WM, some of the R&D team at Mercedes-Benz got involved in Group C racing as a sideline. Swiss engineer Peter Sauber was working with composite-technology company Seger & Hoffmann, stepping up from their BMW M1 collaboration to Group C. They contacted the Mercedes technicians to develop their chassis design and aerodynamics. The resultant SHS C6 was fitted with a 3.96-litre Cosworth tuned by Heini Mader who got it to 540 bhp. Two were built, and sold to Gerhard Schneider (who had bought a Sauber-tuned M1) and Swiss slot-machine magnate Walter Brun. Both cars would be managed for the race by Schneider's GS Sport racing team. Brun drove his car with Siegfried Muller Jr, while the other had team-regular Hans-Joachim Stuck joined by Jean-Louis Schlesser and Dieter Quester.Spurring 2012, p.103Wimpffen 2008, p.54
With the Porsche 956 not available for customer sale until the next year, both Joest and Kremer were given copies of the Porsche 936 factory plans to build their own replica versions. Reinhold Joest fitted the new 936CJ with a 2.5-litre turbo engine, and ran it alongside the older 936/77, to give Bob Wollek the DRM championship. Purchased by the Belgian Martin brothers, they ran it in the WEC with Wollek, with their red and white Belga tobacco sponsorship. After they got a third at Silverstone, Philippe Martin crashed the car heavily at Nürburgring. The rebuild gave the engineers the chance to fit a long tail and low-drag nose for the circuit.Spurring 2012, p.100 The Kremer brothers' Porsche replica, the C-K5, had a 936 frame fitted with their own Kevlar-blended sharkfin chassis and had the transaxle and rear suspension from their previous year's unsuccessful 917 project. It was fitted with their 2.3-litre twin-turbo flat-six engine and was capable of reaching 330 kp/h (205 mph). But finished at the last minute there had been no time for track-testing. They continued the productive relationship with Ted Field's Interscope Racing, and his regular driver Danny Ongais, along with the Kremer's 1979 Le Mans winner, Bill Whittington.Spurring 2012, p.101