Porsche 2708
The Porsche 2708 is an open-wheel race car developed and fielded by Porsche in CART Indy car racing from CART PPG Indy Car World Series|1987] to 1990.
History
1987/1988: Porsche chassis
Porsche entered American CART racing late in 1987 with a new car created specifically for the series. This was a new, all-Porsche design, with an aluminum-plastic monocoque chassis developed by Norbert Singer and a V8 engine developed by Hans Mezger. The Type 9M0 engine is a load-bearing element of the chassis. The engine has a single turbocharger, and is fueled by methanol, as per CART regulations.Al Holbert, who had won Le Mans three times in a Porsche 956 sports car and was fourth in the Indianapolis 500 in 1984, was chosen to head up the team and serve as a test driver. Holbert died in a plane crash in September 1988. Another driver was 1987 Indy winner Al Unser, who was 49 years old at the time. Early on, the car was disappointing on both high-speed ovals and road courses. In Indianapolis, Teo Fabi and his green and white Quaker State March/Porsche qualified seventeenth, but retired after thirty laps with a wheel failure.
One of the three vehicles built is on loan to the Cité de l'Automobile - Musée National - Collection Schlumpf in Mühlhausen, but belongs to the Porsche Museum in Zuffenhausen. One is now part of the permanent exhibition "Success story: Porsche Motorsport" in the EFA Museum for German automobile history in Amerang / Chiemgau.
1989/1990: March chassis
With the exceptions of Penske Racing and AAR Eagle, most CART teams at the time did not build their own car, but bought a chassis from a constructor like Lola, and then fitted it with an engine from Chevrolet, Ford-Cosworth, Judd, or Buick. Porsche opted for March Engineering, manufacturer of the CART championship car from 1986 and 1987 and a five-time Indy winner with Cosworth engines. The March 89 was adapted to the Porsche engine and called the 89 P, which is why the vehicle ran as the March-Porsche 89 P until the end of its use in 1990.Fabi qualified thirteenth in Indy in 1989, but retired after 23 laps with an engine failure.
In 1990 John Andretti joined the team, and started in tenth place at the 1990 Indianapolis 500. The two car team, now trimmed in blue to reflect new sponsorship from Foster's Lager, managed over two-thirds of the distance of approximately, but retired due to an accident and gearbox damage.
Porsche's largely unsuccessful involvement in the CART series ended late in 1990, although it did produce Porsche's first Indy Car victory - that of Fabi on September 3, 1989, at the Mid-Ohio Sports Car Course. Porsche's attention soon turned to another single-seater project with the naturally aspirated Porsche 3512 V12 in the Footwork FA12 in Formula 1.
A total of 15 copies of the Porsche 2708 and March-Porsche 89 P were produced. A blue number 4 is at the Boxenstop Automobile and Toy Cars Museum in Tübingen, Germany.
Technical Data
| Feature | Detail |
| Engine | Porsche V8 with single turbocharger |
| Bore × stroke | |
| Displacement | |
| Power | at 11,200 rpm |
| Torque | at 8,500 rpm |
| Compression ratio | 12.0:1 |
| Valvetrain | Four valves per cylinder, DOHC, gear-driven |
| Cooling | Water-cooled |
| Transmission | 6-speed manual transmission |
| Brakes | Disc brakes |
| Front suspension | Double wishbone suspension, inboard springs and dampers |
| Rear suspension | Double wishbone suspension, inboard springs and dampers |
| Chassis | Monocoque |
| Track width | |
| Wheelbase | |
| Tires | Goodyear 9.5"/25"–15", 14.5"/27"–15" |
| Length Width Height | |
| Weight | |
| Top speed |