The last oddball at the Indianapolis Motor Speedway
Part 7: Specifications
Author
- Henri Greuter
Date
- December 17, 2008
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- Introduction
- Part 1: About oddballs
- Part 2: The road towards the 90P
- Part 3: The design
- Part 4: Performance evaluation (1)
- Part 5: Performance evaluation (2)
- Part 6: Final reflections
- Part 8: Results
- Part 9: Insights about the 90P from one of its designers
- March-Alfa Romeo 90CA - Fiasco Italo-Brittanico, by Henri Greuter
- Porsche - Weissach's single Grand Prix win, by Mattijs Diepraam/Felix Muelas
Who?John Andretti What?March-Porsche 90P Where?Indianapolis When?1990 Indianapolis 500 |
 |
Why?
The following data were reproduced from the info sheets as supplied in the Porsche presskit made available during the Month of May in 1990 at the Indianapolis Motor Speedway press room.
Technical data for the 1990 Foster's Quaker State Porsche Indycar
| Chassis: | March 90P, monocoque of aluminium-clad composite sandwich |
| Engine: | Porsche eight cylinder 90 degree V 8, water cooled, four valves per cylinder, dual overhead camshafts, single turbocharger, dual wastegates. |
| Displacement: | 2.649 litres (161.7 cubic inches) |
| Bore: | 88.2 mm (3.47 inches) |
| Stroke: | 54.2 mm (2.13 inches) |
| Compression ratio: | 12:1 |
| Power: |
725 hp at 12,000 rpm. *12,500 maximum rpm |
| Torque: | 343 lb./ft at 8,500 rpm |
| Turbocharger boost pressure: | 45 inches of mercury controlled by a single manifold relief 'pop-off' valve. |
| Ignition/Fuel injection: | Bosch spark plugs, Bosch Motronic |
| Transmission: | 3 shaft, five speed with changeable ratios |
| Suspension: | Dual wishbone upper and lower, front and rear push-rod to rocker with built in coil spring/shock absorber units |
| Rims: |
Front - 10"x 15" Rear 14"x 15" |
| Tyres: |
Goodyear Eagle Racing Radials Front - 25.5 x 10 R15 Rear - 27.0 X 14.5 R15 |
| Length: | 183.5 inches |
| Width: | 78.5 inches |
| Height: | 36 inches |
| Track: |
Front - 67.8 inches Rear - 63.5 inches |
| Wheel base: | 112 inches |
| Fuel capacity: | 40 U.S. gallons |
| Weight: | 1,550 pounds (less fuel) |