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Porsche 917............. 1969-1971


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PORSCHE 917 from 1969-1971

 

 

The car was designed by chief engineer Hans Mezger under the leadership of Ferdinand Piëch and Helmuth Bott. The car was built around a very light space frame chassis (42 kg (93 lb)) which was permanently pressurised with gas to detect cracks in the welded structure. Power came from a new 4.5-litre air-cooled engine designed by Mezger, which was a combination of 2 of Porsche's 2.25L flat-6 engines used in previous racing cars. The 'Type 912' engine featured a 180° flat-12 cylinder layout, twin overhead camshafts driven from centrally mounted gears and twin spark plugs fed from two distributors.[ The large horizontally mounted cooling fan was also driven from centrally mounted gears. The longitudinally mounted gearbox was designed to take a set of four or five gears.

To keep the car compact despite the large engine, the driving position was so far forward that the feet of the driver were beyond the front wheel axle. The car had remarkable technology for the time. It was Porsche’s first 12-cylinder engine and used many components made of titaniummagnesium and exotic alloys that had been developed for lightweight "Bergspider" hill climb racers. Other methods of weight reduction were rather simple, such as making the gear shift knob out of birch wood, and meticulous scrutiny taken with weight saving components; some methods were not simple, such as using the tubular frame itself as oil piping to the front oil cooler.

Porsche originally build 25 cars to meet the homologation requirements of the FIA over a relatively short period of 10 months with very little time for testing. A further 12 cars were constructed between 1970 and 1971, some of these were built from modified chassis of the original 25 cars, along with a large number of spare parts and replacement chassis needed to go racing. There are at least eleven variants of the 917 during the period 1969-1971. The original version had a removable long tail/medium tail with active rear wing flaps, but had considerable handling problems at high speed because of significant rear lift. The handling problems were investigated at a joint test at the Österreichring by the factory engineers and their new race team partners John Wyer Engineering and after exhaustive experimentation by both groups, a shorter, more upswept tail was found to give the car more aerodynamic stability at speed. The changes were quickly adopted into the 917K for Kurzheck, or "short-tail".

In 1971, a variant of the 917K appeared with a less upswept tail and vertical fins, and featured the concave rear deck that had proved so effective on the 1970 version of the 917L. The fins kept the clean down force-inducing air on the top of the tail and allowed the angle of the deck to be reduced, reducing the drag in direct proportion. The result was a more attractive looking car that maintained down force for less drag and higher top speed.[10]

By this time the original 4.5-litre engine, which had produced around 520 bhp in 1969, had been enlarged through 4.9-litres (600 bhp) to 5-litres and produced a maximum of 630 bhp. The 917K models were generally used for the shorter road courses such as Sebring, Brands Hatch, Monza and Spa-Francorchamps. The big prize for Porsche however, was Le Mans. For the French circuit's long, high speed straights, the factory developed special long tail bodywork that was designed for minimum drag and thus highest maximum speed. On the car's debut in 1969, the 917L proved to be nearly uncontrollable as there was so little down force. In fact, they generated aerodynamic lift at the highest speeds. For 1970, an improved version was raced by the factory and for 1971, after very significant development in the wind tunnel; the definitive 917L was raced by both factory and JW. These cars were so stable that the drivers could take their hands off the steering wheel at speeds which reached 246 mph.[11]

In 1971 Jo Siffert raced an open-top 917PA Spyder (normally aspirated) in the 1971 CanAm series.[12] There is also the "Pink Pig" aerodynamic research version (917/20), and the turbocharged 917/10 and 917/30 CanAm Spyders. Porsche 917s also raced in the European Interseries in various configurations. In the 1973 Can-Am series, the turbocharged version Porsche 917/30 developed 1,100 bhp (820 kW).[2]

 

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Racing history
1969-1971 World Sport scar Championship

1969
In testing, it soon appeared that the Porsche 917 did not work well on the race track. Porsche factory driver Brian Redman recalled that "it was incredibly unstable, using all the road at speed." Many thought that the 4.5-litre engine was too much for the frame. The suspension and the stability of the frame were suspected, but modifications did not improve the problem. It was finally determined that the "long tail" body was generating significant lift on the straights, as the 917 was 30 km/h (19 mph) faster than anything previously built for Le Mans. As with former underpowered Porsches, the 917 aerodynamics had been optimized for low drag in order to do well on the fast straights of Le Mans, Spa, Monza and elsewhere. The significance of down force for racing was not yet fully realized although Can-Am and F1 cars were using wings by that time.
Before its competition debut on 11 May 1969 in the 1000km Spa, the weather conditions prevented further improvements in tests. Jo Siffert/Redman managed to clock an unofficial lap time of 3:41.9 which would have beaten the pole of 3:42.5 set by a Lola, but they chose to use the 908LH long tail with which they won the race and set the fastest lap at 3:37.1. Gerhard Mitter/Udo Schütz actually started the race from 8th, but their already ailing engine failed after one lap.

Three weeks later for the 1000km Nürburgring, all works drivers preferred the 908 over the 917 which was, despite some modifications, not suited for the twisty track. As it was necessary to promote the car in order to sell the surplus ones, Porsche asked BMW for the services of their factory drivers Hubert Hahne and Dieter Quester. They practised, but Munich declined permission to have them race, so Englishman David Piper and Australian Frank Gardner were hired on short terms. They drove the 917 to an eighth-place finish behind a Ford and an Alfa, while the factory's armada of six 908/02 spyders scored a 1-2-3-4-5 win after the only serious competition, a sole Ferrari 312P, failed.
At the 1969 24 Hours of Le Mans, the 917s were quickest in practice. Soon after the start the poor handling of the 917 and the inexperience of one of the drivers resulted in drama: British gentleman-driver John Woolfe crashed his Porsche 917 at Maison Blanche on lap 1, dying as a result. Woolfe was the first privateer to race a 917. The works #14 917 led early, but succumbed to an oil leak, while the #12 dropped out of the lead and the race in the 21st hour with a broken gearbox, despite leading by nearly 50 miles. At the end, Hans Herrmann's 908 remained as the only Porsche that could challenge for the win, but Jacky Ickx's more powerful Ford won once again, by a mere 120 metres (390 ft).
In June 1969, Enzo Ferrari sold half of his stock to FIAT, and used some of that money to build 25 cars powered by a 5-litre V12 in order to compete with the Porsche 917: the Ferrari 512 would be introduced for the 1970 season.
At that time, the 917 already had several races under its belt, yet no success. The first win came in the last race of the championship season, the 1000 km Zeltweg. Jo Siffert and Kurt Ahrens succeeded in the privately entered Porsche 917 of German Freiherr von Wendt. At that time, the factory had started to focus on development, leaving the time-consuming trips to races to customer teams.

Disappointed by the poor results of the 917 in 1969, and facing new competition, Porsche concluded an agreement with John Wyer and his JWA Gulf Team, which became the official Porsche team, and also the official development partner. During tests at the Österreichring at Zeltweg, works drivers Redman and Ahrens tested the car, and the car still had stability issues like it did before. The Österreichring was the circuit where the car had won its only race at that time, Wyer's chief engineer John Horsman noticed that the bodywork had a pattern of dead insects smashed against it, thus revealing the airflow over the car. The tail was clean—the lack of dead insects indicated that the air was not flowing over the tail. A modification to the tail was cobbled-up on the spot in the pits with aluminium sheets riveted together. This new short tail gave the 917 much needed downforce. The plastic engine intake cover had all so been removed in an effort to get air flow over the tail of the car. Redman and Ahrens were doing only one lap at a time before the modification was made, they each did 10 laps after this and were satisfied with the improved stability and performance. Clearly they were onto something here.
The new version was called 917K (Kurzheck, or "short tail").
In addition to the heavier and powerful 917, the lightweight and compact Porsche 908/3 were developed for the slow and twisty tracks of the Nürburgring and the Sicilian mountain roads used in the Targa Florio, providing wins while the factory-backed 917 remained in the garages, as these cars were not suitable for these tracks. The 908/3 was built to the FIA's 3-litre Group 6 Prototype regulations whereas the 917 was now officially a Group 5 Sports Car following another FIA review of its racing classes, applicable from 1970.


Wyer was surprised to discover that another team was carefully preparing for the 1970 24 Hours of Le Mans with close support from Porsche. As in 1969, the Porsche Salzburg team was a de facto works team under control of members of the Porsche family. The Martini Racing team also gained support from Porsche AG; obviously Porsche made efforts to win the race by supporting more than one team.
Also, a new low drag version of the 917 was developed for Le Mans with support from the external consultant Robert Choulet. The 917LH (Langheck) featured a spectacular new long tail body which had very low drag, yet more rear downforce than the 1969 long tail. A 4.9-litre engine, introduced at 1000km Monza, was available but these proved to be unreliable for longer distance races.
The 917 did not compete at all the races of the season, however. Porsche's previous competition model, the 908, was redesigned with an all-new chassis and designated 908/03 so it would be used at the Targa Florio and Nurburgring 1000 km events- two twisty, narrow and slow tracks the 917 was not competitive at. Vic Elford drove a 917 during practice for the 1970 Targa Florio and it proved to be so physically demanding and difficult to drive around the circuit that he had to be lifted out of the car, although he set the 5th fastest time. The 908/03 was very effective at these two races. Porsche's dedication was such that they were building cars for each type of track- the 908/03 for the slow, twisty tracks, the 917K for the medium and high-speed tracks, and the 917L for the fast straights of Le Mans.
The favourite team to win, Gulf-backed John Wyer Automotive, lined up three 917Ks, two with the 4.9-litre engine and one with the 4.5-litre unit.

Two 917 LH were entered in Le Mans, one in white and red trim by Porsche Salzburg. Driven by Vic Elford and Kurt Ahrens, the pole sitter's 4.9-litre engine dropped an inlet valve after 225 laps. Both drivers had also been entered on the team's other car, a red and white 917 K with the 4.5-litre engine, qualified by Hans Herrmann and Richard Attwood in rather low 15th spot, but they did not drive after their own car failed.
The other LH was entered by Martini Racing, qualified by Willy Kauhsen and Gérard Larrousse on 12th position. The spectacular livery of this car was elaborate whirls and swoops of light green on a dark blue background. The car with the 4.5L engine gained the nickname of the Hippie Car or the Psychedelic Porsche from the team and media.
Early in the race, most of the works Ferrari 512 entrants eliminated each other in a shunt. The two Porsche factory teams, Gulf-Wyer and Porsche Salzburg, continued to battle each other, but all Wyer cars were out after 12 hours. At the end it was the red and white #23 917K of Porsche Salzburg, with the standard 4.5-litre engine, carefully driven by Stuttgart's own Hans Herrmann and Englishman Richard Attwood through the pouring rain, that finally scored the first overall win at Le Mans, in a wet race that saw only 7 ranked finishers. Martini's 917LH came in 2nd. Both cars were later paraded across Stuttgart. In addition to Porsche's triumphant 1, 2 victory, a Porsche 908 came in third overall, a Porsche 914-6 came in sixth overall (plus it won the GT class), and a Porsche 911S was seventh. (Two Ferrari 512s took fourth and fifth place overall.)
Towards the end of the 1970 season, Ferrari entered some races with a new version of the 512, the 512M (Modificata). The 512M had new bodywork built on a similar aerodynamic doctrine as the Porsche 917K. At the end of 1970 the 512M was as fast as the 917s. But still lacked in reliability.
During the 1970 season the FIA announced that Group 5 Sports Cars would be limited to a 3-litre engine capacity maximum for the newly renamed World Championship of Makes in 1972, so the big 917s and 512s would have to retire from the championship at the end 1971. Surprisingly, Ferrari decided to give up any official effort with the 512 in order to prepare for the 1972 season. A new prototype, the 312 PB, was presented and entered by the factory in several races. But many 512s were still raced by private teams, most of them converted to M specification.

By the end of 1970, Porsche had stamped their authority on endurance racing by convincingly dominating the championship that year. Of the 10 races in the championship (plus some other non-championship events), the works teams (John Wyer Automotive and Porsche Salzburg) had won every race except Sebring (which was won by Ferrari) that year with the two models of cars they used, the 917K and the 908/03; with the 917K winning 7 of 8 events it was entered in; and the 908/03 winning at the Targa Florio and the Nürburgring (the 917K was not entered by the works teams at these 2 events). Still having some of their 25 cars remaining unsold, Ferrari offered them to customers at a bargain price - a move that had hardly been imaginable less than two years previously. For Porsche, the original production series of 25 917s could not satisfy demand. Over 50 chassis were built in total. An underdog for 20 years, Porsche had turned itself into the new leader of sports car racing with the 917
 

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The 917 in 1971

 

The domination of Gulf-Wyer and Martini Porsches in 1971 was overwhelming. The only potential challenger to the 917 appeared early in the season: Roger Penske had bought a used 512S chassis that was dismantled and rebuilt beyond M specification. The car was specially tuned for long races, receiving many unique features among which were a larger rear wing and an aviation-inspired quick refuelling system. The engine was tuned by Can-Am V8 specialist Traco and able to deliver more than 600 hp (450 kW). Penske's initiative was not backed by Ferrari works. This 512M, painted in a blue and yellow livery, was sponsored by Sunoco and the Philadelphia Ferrari dealer Kirk F. White. Driven by Penske's lead driver Mark Donohue, it made the pole position for the 24 Hours of Daytona and finished third despite an accident that required almost an hour in the pits. For the 12 Hours of Sebring the "Sunoco" made the pole but finished the race at the sixth position after making contact with Pedro Rodríguez's 917. Despite being fastest on track on a few occasions, the 512M was not a serious contender.

 

 

The presence of the 512M "Sunoco", as well as the Alfa Romeo T33/3 which won Brands Hatch, the Targa Florio and Watkins Glen, forced Porsche to pursue their efforts in research and development the tails of the 917K and the 908/3 were modified with vertical fins, and the 917 LH aerodynamics received further improvements. New chassis made of magnesium were developed, even though this material could burn vigorously in the instance of a fire.

A heavily modified car, the 917/20, was built as test-bed for future Can-Am parts and aerodynamic "low-drag" concepts. The 917/20 which had won the test race at Le Mans was painted in pink for the 24 hours race, with names of cuts of meat written in German across it in a similar fashion to a butcher's carcass diagram, earning it the nickname "Der Trüffeljäger von Zuffenhausen" (The Trufflehunter of Zuffenhausen, pigs being often utilized for locating truffles for harvest) or just plain "Pink Pig". This experimental car surprisingly qualified 7th for its only race- the 1971 Le Mans 24 Hours, but during the night Reinhold Joest crashed the car after its brakes failed. This was because the 917/20 was harder on the brakes than the K, but ran to the same brake change schedule].

And at Le Mans, once again it was not the new machinery that won. The white #22 Martini-entered 917K (chassis number 053) of Helmut Marko and Gijs van Lennep, equipped with a magnesium frame, set an overall distance record that stood until 2010 when the Audi R15 TDI of Romain DumasMike Rockenfeller and Timo Bernhard set a distance record of 5,335.313 km (3,315.210 mi), an average speed of 220.2 km/h (137.6 mph). This Porsche still holds the fastest lap at the Le Mans racing circuit to this day (3:13.6) but of course, there have been a number of fundamental changes to the circuit since 1971. Pedro Rodriquez had also set a qualifying lap record of 3:13.9, setting him at pole position in his #18 John Wyer Gulf LH car that unfortunately did not finish the race . Another LH car from the Martini team set a top speed record of 241mph before retiring due to engine failure. All in all, 4 separate Le Mans track records were broken that year: Fastest qualifying lap, fastest in-race lap, highest top speed, and longest distance covered. All set by 917s.

 

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Variants

There were a number of versions of Porsche 917 made over the years; at least eleven different versions have existed.

1969 917:

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917

This was the original Porsche 917 made by Porsche from 1968 to 1969 to comply with the CSI rules about entering a car in the World Sportscar Championship. This car was first run at Le Mans and had considerable handling problems due to aerodynamic lift. The original specification of the car included a detachable long-tail (Langheck), that was designed using experience from the previous 907 long-tail coupes for minimum aerodynamic drag (with suspension controlled moving flaps). A short-tail version was run at the 1969 Nurburgring 1000 km, which had no moving flaps and a full-width rear spoiler. None of the early specification 917s are known to have survived with this bodywork - all being converted at a later stage to the vastly improved 1970-spec Kurzheck or Langheck specifications. One 917L is known to have been destroyed (917L-005 - J.Woolfe) at Le Mans and one or two others simply location unknown although many suspect some were scrapped by the factory as being 'tired chassis' with new replacements being built when needed by customers.

1969 917PA (Porsche-Audi):

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Porsche 917-PA

This car was an open topped and short-tailed version of the original 917 and was made to be raced in the Can-Am championship. It was raced by Swiss Jo Siffert without much success. The 917PA's gently upswept tail was one of the catalysts that led to the later aerodynamic breakthrough with the aerodynamics of the 917 coupe.

1970 917K (Kurzheck, German for "short tail"):

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917K (1970)

The 917K was an evolution of the original 1969 car. After the first 917s were run in 1969, it was clear the car's aerodynamics made it nearly undriveable at higher speeds. After the 1969 championship season had finished, John Wyer requested a 3-day test session at the Austrian Österreichring (Zeltweg) course. The Porsche technical team turned out ready to do some serious panelwork on the coupe and in order to make a comparison, brought along the Can-Am 917PA Spyder. The drivers present instantly preferred the PA and together, the JW and Porsche engineers came up with the idea of a more upswept tail (as on the 917PA). The JW team had had similar high speed handling problems with the early Ford GT40 models. With gaffer tape and aluminium sheet a completely new short tail was evolved at the racetrack. This was quickly converted into a 'production' design back at Porsche and the 917K (Kurzheck) made its public debut at the 1970 season opening Daytona 24 Hours. Such was the improvement in the stability of the car at high speed, the 917K became the standard configuration for all races except Le Mans. This car was raced at every event by the two factory-supported teams (John Wyer Automotive and Porsche Salzburg) in the 1970 season except the Targa Florio and the Nürburgring 1000 km. The smaller, more nimble and generally better suited 908/03s were used for those races. The 917K won 7 out of 10 races; all the races it competed in. Later on in the 1970 season, the 4.5 liter flat-12 was bored out to 4.9 liters, then 5 liters.

1970 917L (Langheck, German for "long tail"):

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917L

This longtail, low drag version of the 1969 917L was purpose-built for the 1970 Le Mans 24 Hours. Le Mans in 1970 was almost entirely made up of long straights and this version was designed to maximise the speed capability resulting from the increased power developed by the flat-12 engine over the previous Porsche types. The 1970 917L was significantly developed from the initial 1969 car. Nevertheless, factory driver Vic Elford had found the car's ultimate speed an advantage enough over its still questionable handling in the braking and cornering sections of Le Mans. It was 25 mph faster down the straights than the 917K and the Ferrari 512Ss.[16] Two were raced in the 1970 Le Mans race, one was entered by Porsche Salzburg (SER#917L 042) (White/Red Shell livery) and another was entered by Martini International, (SER#917L 043) painted in psychedelic colors. The Porsche Salzburg 917L was qualified in pole position by Vic Elford, but this car retired with engine failure after 18 hours and the Martini 917L finished 2nd, 5 laps behind the winning Salzburg 917K of Hans Herrmann and Richard Attwood. Le Mans was the only race in which the 917Ls competed in that year. Of the two, only the Martini car (917L-043)is known to exist outside the factory collection: it is on display at the Simeone museum in Philadelphia. There was a major longtail crash during testing in 1970 at the VW test track near Wolfsburg, involving Kurt Ahrens in chassis 917L-006/040. A total of six 917L models were built and used between the 1970 and 1971 season(040-041-042-043-044*-045). *Unused spare chassis reportedly swapped for 043's. (No documentation)

1971 917 16 Cylinder:

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917 16 Cylinder (1971)

In an effort to increase power and keep up with other more powerful cars in the Can-Am championship, a 6.6-liter, 750PS (551kW, 739 bhp) flat-16 engined prototype was developed. It was 80 kg heavier than the existing 12-cylinder engine and had a 270mm longer wheelbase. It was never raced.

1971 917K:

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917K (1971)

The 917K was further developed for the 1971 season, and the car had vertical fins and 2 airboxes on the tail section for better aerodynamics and cooling. The fins retained the airflow over the rear part of the bodywork, allowing the deck height to be reduced for a given level of downforce. As a result, the 'finned' 1971 917Ks were faster than the 1970 versions. This version proved as successful as the preceding 1970 version. TA version of this model won Le Mans in 1971; but it had a specially-built (lighter) magnesium tube-frame chassis (whereas all the other 917Ks had an aluminum tube-frame chassis).

1971 917LH* (Langheck, German for "long tail"):

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917LH

The 1971 model was a further development of the 1970 917L and was also made specifically to compete in only one race: the 1971 Le Mans 24 Hours. The car was also more stable than its 1970 predecessor because of new bodywork and revised suspension set ups and partially enclosed rear wheels covers. The front section was also redesigned. The three LHs were run at Le Mans in 1971: two were run by John Wyer's team (SER#917L-043 and 917L-045) (Both Gulf livery) and one was run by the Martini International team, (SER#917L-042) (Silver Martini Racing livery). Although Jackie Oliver qualified one of the Wyer 917LHs on pole position, none of the three cars finished the race. This was the last race in which the 917LHs were run in. Only three 917Ls survive and each is on display in a museum: 917L-042 is on display at the Porsche museum in Stuttgart, 917L-043 is on display at the Simeone Foundation Automotive Museum in Philadelphia, PA and 917L-045 displayed at the Le Mans museum. 045 was repainted like 042 and they are now both painted in identical 1971 Martini colours. Chassis 043 ( 044 ), which is now in the Simeone Foundation Automotive Museum, was restored to its 1970 Martini 'hippie' colours prior to its sale in the 1998 Christie's Pebble Beach auction.[17] * LH is non-factory term used here but is generally accepted by most to describe the 'rework' for the 1971 season of the previous 1970 L models.

1971 917 Interserie Spyder:

Of the three Porsche 917 Interserie built for use in the German Interserie championship, two were converted over from two Porsche 917PAs and one was rebuilt from a 917K that was crashed by motorcycle ace Mike Hailwood during Le Mans in 1970. These cars were very successful in that series of racing, winning the 1971 championship..

1971 917/10:

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Porsche 917/10

This development of the 917PA was run in the North American Can-Am championship and was driven by Jo Siffert. It was moderately successful; Siffert was shut out of the top 3 points positions for that season.

1971 917/20:

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Porsche 917/20 "Pink Pig"

This variant was a one-off experimental research and development (R&D) car. It was made as an intermediate car to combine the low drag of the LH and the stability of the K, and was also a test-bed for future Can-Am parts and aerodynamic low-drag concepts. It was only raced once, at Le Mans in 1971 where it was entered by the Martini International team and driven by Germans Reinhold Joest and Willi Kauhsen. This variant was known as "Pink Pig" for its broad proportions and pink livery with meat cuts running over the bodywork. Although it qualified seventh, it retired from the race after a heavy accident while Joest was driving. The car still exists and after being restored, it is on display at the Porsche Museum in Stuttgart.

1972 917/10:

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917/10 (1972)

This car was Porsche's first full-hearted attempt at Can-Am in 1972; new WSC regulations only allowing prototypes with engines up to 3 liters rendered the 917's obsolete for that series. This car ran the 5-liter Flat-12 and was modified to accommodate additional compression; two turbochargers were added to give the car tremendous horsepower. George Follmer won the Can-Am championship that year. Twelve of these cars still exist.

1973 917/30:

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Porsche 917/30

This variant, the final official iteration of the 917, is perhaps the most powerful sports racing car to have ever existed. The car had all new bodywork, and the twin turbocharged engine was bored out to 5.4 liters giving it 1100–1580 horsepower,[18] depending on the state of tune. These cars dominated Can-Am racing so easily that the series lost popularity in the United States. A total of six chassis were built[19].

 

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As iconic as the Gulf livery is, I think Team Salzburg #23 is my favourite. 

I take it you'll be doing the 908 and GT1 at some point? :) 

13 hours ago, Airhead said:

Just to put the 917 into perspective the 914 was built in the same year.

They look huge, but in fact are tiny.

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2 hours ago, JV911 said:

As iconic as the Gulf livery is, I think Team Salzburg #23 is my favourite. 

I take it you'll be doing the 908 and GT1 at some point? :) 

They look huge, but in fact are tiny.

 Same. The Salzburg scheme looks brilliant. 

 Think @Raven should do the whole series of classic Le Mans Porsches. 906 for me mate 

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