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| Porsche flat-12 engine | |
|---|---|
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| Overview | |
| Manufacturer |  Porsche |
| Production | 1969–1973 |
| Layout | |
| Configuration | 180° flat-12 |
| Displacement | 4.5 L (4,494 cc) 5.0 L (4,999 cc) 5.4 L (5,374 cc) |
| Cylinder bore | 85 mm (3.3 in) 86.8 mm (3.4 in) 90 mm (3.5 in) |
| Piston stroke | 66 mm (2.6 in) 70.4 mm (2.8 in) |
| Valvetrain | 24-valve, DOHC, two-valves per cylinder |
| Combustion | |
| Turbocharger | Yes (Twin-turbocharged; some models) |
| Fuel system | Multiport Mechanical Fuel Injection |
| Fuel type | Gasoline |
| Oil system | Dry sump |
| Cooling system | Air-cooled |
| Output | |
| Power output | 520–1,600 hp (388–1,193 kW)[1][2][3][4][5][6] |
| Torque output | 350–1,450 lb⋅ft (475–1,966 N⋅m)[7] |
Porsche produced a series of naturally-aspirated, and later an extremely powerful twin-turbocharged flat-twelve engine for their Porsche 917 sports prototype; between 1969 and 1973.[8]
- ^ "Watch a Porsche 917 engine get torn down and rebuilt in minutes".
- ^ "I Bet You Didn't Know Porsche Built a 16-Cylinder Engine". 15 February 2021.
- ^ "Five Ballistic Twelve-Cylinder Exhaust Notes in Motorsport that Don't Belong to a Ferrari".
- ^ "Time-Lapse of a Porsche Flat-12 Rebuild – Engine Swap Depot".
- ^ "Here's Why the Porsche 917 is Priceless". June 2020.
- ^ "The 1600-HP Porsche 917/30 Can-Am Spyder Sounds the Business". 18 January 2019.
- ^ "Spicer Horsepower and Torque Calculator".
- ^ "Gaze in Wonder at This Porsche 917/30 Flat-12 Fresh out of Canepa's Shop". 18 May 2020.