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Porsche 917/20 Le Mans
An attempt to blend the best aerodynamic characteristics from both the short-tailed 917 K and long-tailed 917 LH led to the the 917/20, otherwise known as the Pink Pig. The car's combination of a long body, stubby face, and wide hips gave it a pig-like look, which inspired Porsche designer Anatole Lapine to give the car a pink paint job with butcher cut lines covering the exterior. It was hugely popular at the 1971 Le Mans race, and was the fastest in qualifying and nearly came in fifth place, before a brake failure caused it to crash before the finish line.
The “shark fins” on the tail gave the Porsche 917 KH 1971 greater directional stability and reduced wind resistance by 11 percent. In 1971 a veritable armada of six Porsche 917s started at Le Mans. The car with start number 22 was special. The white race car with the characteristic Martini stripes had the new “shark fins” on the tail that Porsche had first used in pretraining in April. This 917 was also the first Porsche with a magnesium tubular frame to be used in a race.
Although the longtail 917 was introduced first, it was meant only for the Le Mans. This meant, the short tail 917 K ("Kurz" in German for short) was raced first. The only engine available in 1969 was the 4.5-litre flat 12. The factory team enters one 917 K also for the Nürburgring 1000 km race, where it scores 8th. The factory team would not enter 917 K for racing anymore in the season, only private teams will.
Jo Siffert was the first to take the 917 to Can-Am championship. The car he used in 1969, was the 917 PA Spyder. Although he participated in one Can-Am race in 1970 with a 917 K, that season he skipped. He was back from mid-season 1971 and now with the 917/10. Only two 917/10 were created in 1971. The chassis 001 was used for testing and the 002 by Siffert. He took part in six races out of ten, managed podium finishes three times and scored 4th in the season, like in 1969.
The final evolution of the 917 was created after Ferdinand Piëch had left the Porsche company in 1972. Two complete 917/30 Can-Am cars with 2500 mm (98.4") wheelbase were made for Roger Penske Enterprises racing team. They were chassis 917/30-002 and 003. The 001 car was not a real 917/30 and was raced in Europe at the Interserie. The Can-Am 917/30 had a 5.4-litre flat 12-cylinder twin-turbo engine which produced so much power that nobody really knew how much.
Like the 917 LH of 1969 and 1970, the 1971 version was also made for one race only - the 24 hours of Le Mans. The 917 LH-70 had already proved that the body was excellent for Le Mans, so the aerodynamical modifications for 1971 were mild. The front was modified and the rear wheels were covered. The 917 LH-70 that scored 2nd at the 1970 Le Mans 24H (chassis 917-043) was modified for the Le Mans 1971.
With the aerodynamic instability of the 917 in the 1969, two separate configurations were used in 1970. These were the short-tail Kurzheck version and the less common Langheck or long-tail. Most of the 917's accolades were achieved by the 917 Kurzheck, leaving the Langheck a less popular, but ultimately just as potent contender.
By 1969, Porsche develops the 917 Spyder with a view to competing in the extremely popular North American racing series, the Canadian American Challenge Cup (Can-Am). Three units featuring 4.5-litre twelve-cylinder naturally aspirated engines are constructed in Zuffenhausen, and Jo Siffert takes one to the US to compete in the Can-Am races, ultimately placing fourth overall. The car becomes known as the 917 PA Spyder, with “PA” standing for “Porsche + Audi” as they are the two sales organisations in the US at the time.
The Group 7 class in CanAm was virtually unlimited with regard to regulation, so Porsche was free to try many different avenues to source extra power. Two main themes were explored: the first was to go into uncharted territory and turbocharge engines with an exhaust-driven turbine. Eventually this was the chosen route, but it didn't reach fruition until a larger 16-cylinder engine was tried.
Porsche 917/10 Turbo
The first turbo-Porsche, Can-Am winner 1972, Interserie winner 1972, 1973. The first ever publically seen turbocharged Porsche was the 917/10 Turbo with chassis number 917/10-011. It was entered for the June 11, 1972 Can-Am Mosport race. Mark Donohue was fastest in the qualification with it, but scored second in the 80 laps race after the 8.1-litre McLaren. The Porsche Turbo era had begun. Eight 917/10 were racing in 1972 in Can-Am and in Interserie.