Porsche 940 classic cars for sale

History of the Porsche 940

The Porsche 940 traces its roots to the late 1970s, when the German manufacturer set its sights on the American IndyCar series. Commissioned for Interscope Racing and team boss Ted Field, the car was designed to challenge American motorsport at the iconic Indianapolis 500. Despite Porsche's renowned engineering prowess and experience from endurance racing, the 940 project faced numerous hurdles—including rapid rules changes and power struggles within the US racing authorities (USAC versus CART), which ultimately meant the car was never able to compete as intended. This left the 940 as a technological milestone and a symbol of 'what could have been' in Porsche’s racing history.

Model history of the Porsche 940

The 940's direct predecessors can be considered Porsche's successful Le Mans prototypes from the 1970s. The car adopted a revised twin-turbo flat-six engine derived from Porsche’s Le Mans efforts but reengineered for IndyCar regulations. In the years following the 940 project, insights and technological advancements, especially from the powertrain, heavily influenced the subsequent Porsche 956 and 962 models, both of which became dominant forces in international endurance racing. The 940 thus bridges the gap between Porsche’s 1970s endurance cars and their era-defining Group C racers of the 1980s.

Highlights and unique features of the Porsche 940

No other Porsche model embodies the brand’s foray into American open-wheel racing like the 940. Notably, its engine was a downsized twin-turbo flat-six, with just one KKK turbocharger due to IndyCar rules. The power output was an impressive 470 kW (about 640 hp) at 9000 rpm, and peak torque reached 559 Nm at 6400 rpm. A four-speed manual gearbox transmitted the power to the rear wheels. The design, with a mid-mounted engine and conventional open-wheel silhouette, epitomised classic IndyCar form, yet packed with Porsche’s signature engineering detail.

Technical data of the Porsche 940

Special Editions and rare Porsche 940 models

Due to its status as a single-project race car, the Porsche 940 did not spawn conventional special editions. However, the few prototypes built for Interscope Racing are considered unique by any standard, effectively making each surviving car a one-off. Their provenance—directly from Porsche’s factory racing division, and their influence upon future Le Mans-winning cars—heightens their value among motorsport historians and Porsche collectors.

Weak Spots and common issues with the Porsche 940

Due to the extremely limited number and prototype nature of the Porsche 940, comprehensive data on typical faults is scarce. As with any highly specialised racing machine, complex bespoke components—especially engine internals, unique induction and turbo systems, and custom transmission parts—would require extensive expert maintenance. Availability of original spares is negligible, necessitating custom fabrication in most scenarios. Prospective caretakers must look to specialists familiar with late 1970s Porsche racing technology for any restoration or upkeep requirements.

Engine, transmission and driving experience of the Porsche 940

The Porsche 940 delivered a formidable performance pedigree, thanks to its heavily reworked turbocharged flat-six engine. It achieved a peak speed of approximately 307 km/h on the Ontario Motor Speedway oval. Power delivery was brutal but linear, typical of Porsche’s turbocharged race engines from the era, with maximum output available at high revs (9000 rpm). The transmission—a four-speed manual—sent power to the rear wheels, while the mid-engined layout gave the car optimal weight distribution for high-speed stability and cornering on banked circuits. Since only a handful of 940 prototypes were built specifically for IndyCar racing, every remaining car stands as an example of the breed. Each model is essentially unique, custom-fitted to Interscope Racing specifications.

Design, interior and exterior details of the Porsche 940

Externally, the Porsche 940 followed the classical IndyCar design principles of the late 1970s: wide open wheels, low bodywork, and a high rear wing for maximum downforce on ovals. The monocoque was shaped for stability at over 300 km/h and to accommodate the compact, race-spec turbo flat-six. As a pure racing machine, the interior was minimal, fitted with only essential dials and controls necessary for oval racing. Special materials such as lightweight aluminium and magnesium alloys appear throughout. Custom Interscope Racing livery and sponsor decals completed the period-correct look. There was no factory-optional equipment intended for comfort: every element served a performance purpose.

Further features of the Porsche 940

The development of the 940 influenced the evolution of Porsche’s turbocharging strategies in later endurance racers. Its innovative engine concepts, designed to meet American race regulations, helped shape the powertrains of the subsequent 956 and 962 models—cars that would go on to win at Le Mans and cement Porsche’s dominance in international endurance racing throughout the 1980s.

Summary of the Porsche 940

The Porsche 940 is the ultimate outlier among Stuttgart's race cars: an IndyCar challenger born from the intersection of German engineering and American oval racing demands. With only a small number of examples ever built, it remains a technical curiosity—celebrated less for its competition record and more for its bold ambition and lasting technological legacy. Unique engine components, innovative racing design and a major influence on Porsche’s future race cars make the 940 one of the most significant what-if stories in the marque’s long motorsport heritage.