Porsche 917

Porsche 917
MrWalkr · CC BY-SA 4.0 · source
Name	Porsche 917
Manufacturer	Porsche AG
Production	1969–1973
Class	Sports prototype
Layout	Rear mid-engine, rear-wheel-drive

Porsche 917 The Porsche 917 is a sports prototype racing car produced by Porsche AG that achieved landmark victories in endurance events such as the 24 Hours of Le Mans and the World Sportscar Championship. Commissioned during the 1960s motorsport arms race, the 917 combined advances in aerodynamics and engine development to set new standards for speed and reliability in endurance racing. Its development involved key figures and organizations like Ferdinand Piëch, Hans Mezger, and Siegfried Knittel, and it became intertwined with teams such as Porsche Salzburg, John Wyer Automotive Engineering, and Gulf Oil-backed Gulf Racing.

Development and design

Porsche initiated the 917 programme in response to Fédération Internationale du Sport Automobile (FISA) 1968 FIA regulations changes and the aspirations of Dieter Glemser, with engineering leadership from Ferdinand Piëch and engine design by Hans Mezger. Early chassis work occurred at Zuffenhausen and at suppliers including Reutlingen workshops, while prototype testing took place at circuits like Circuit de la Sarthe, Nürburgring Nordschleife, and Silverstone Circuit. The design emphasized a lightweight spaceframe with aluminum and later magnesium alloys developed in consultation with fabrication specialists such as Recaro and aerodynamicists influenced by research at Daimler-Benz and feedback from drivers like Richard Attwood, Pedro Rodríguez, and Jo Siffert. The 917's bodywork underwent iterations informed by wind tunnel data from facilities used by McLaren and Ferrari programmes and by the aerodynamicists associated with the Royal Automobile Club’s research network.

Technical specifications

Powertrain options were centered on the air-cooled flat-12 developed by Hans Mezger, featuring displacement variations that drew on lessons from Formula One and Can-Am engines developed by groups including Brabham and Bruce McLaren Motor Racing. Early units produced roughly 520–600 horsepower, with later turbocharged and long-tail versions reaching outputs comparable to contemporaneous Ford GT40 and Matra-Simca rivals. The chassis used tubular steel spaceframe architecture similar to structures employed by Lotus and Cooper Car Company, while suspension components reflected principles used by Penske Racing and Team Lotus, including unequal-length wishbones and inboard dampers. Braking systems matched innovations from Lucas Industries and Brembo suppliers used by Scuderia Ferrari, and transmission choices included 5-speed gearboxes derived from collaborations with ZF Friedrichshafen AG and parts suppliers linked to Getrag. Aerodynamics evolved with long-tail and short-tail configurations influenced by developments at Aerodynamics Research Laboratories and practical insights from teams like John Wyer Automotive Engineering and Gulf Racing.

Racing history and competition

The 917 debuted at events where rivals like Ford Motor Company’s GT40, Ferrari S.p.A.’s 365 P4, and Matra Sports contested the World Sportscar Championship and national endurance races. Its first major victory came at the 24 Hours of Le Mans in 1970 with drivers associated with Porsche Salzburg and later repeated in 1971 amid fierce competition from teams such as Scuderia Ferrari and privateer entries like Ecurie Francorchamps. The car campaigned in series overseen by Fédération Internationale de l'Automobile and against entrants fielded by organizations including John Wyer Automotive Engineering, Hispano-Suiza-backed teams, and privateers like Joest Racing. Notable drivers included Jo Siffert, Brian Redman, Vic Elford, and Graham Hill, all of whom had pedigrees in Formula One and endurance competition for outfits like Team Lotus and McLaren.

Variants and evolutions

Porsche developed numerous 917 variants to address specific circuits and regulations, mirroring evolution strategies seen at Scuderia Ferrari and Shelby American. Notable configurations included the long-tail "Langheck" for Circuit de la Sarthe high-speed stretches, the short-tail "Kurzheck" suited to twistier tracks like Nürburgring Nordschleife, and the development of turbocharged and lightweight variants informed by lessons from Can-Am programmes and collaborations with suppliers such as Hewland. Customer and factory teams fielded evolution models with bespoke bodywork from coachbuilders and aerodynamic houses akin to Carrozzeria Pininfarina and modifications inspired by John Wyer Automotive Engineering and Gulf Oil engineers. Incremental changes to brakes, chassis stiffness, and engine mapping paralleled contemporaneous upgrades by teams including Penske Racing and Brabham.

Motorsport legacy and impact

The 917 reshaped perceptions of endurance racing performance and influenced subsequent projects at Porsche AG, contributing to engineering paths that led to road-legal homologation vehicles and later racing prototypes associated with Porsche 956 and Porsche 962. Its influence extended to automotive suppliers and design practices used by Audi, Bentley, and boutique manufacturers inspired by the 917’s emphasis on lightweight construction and aerodynamics. Cultural impact included representation in media produced by companies like Paramount Pictures and documentaries featuring interviews with protagonists such as Ferdinand Piëch and drivers like Jacky Ickx. The 917 remains a touchstone for collectors, museums such as the Porsche Museum, and historic racing teams like Kremer Racing and Derek Bell-linked exhibitions, cementing its place in motorsport heritage and influence on later FIA-regulated prototype development.

Category:Porsche racing cars