| Alfa Romeo 12-cylinder engine | |
|---|---|
| Overview | |
| Manufacturer |  Alfa Romeo |
| Production | 1973–1982 |
| Layout | |
| Configuration | 60°-180° V-12/flat-12 |
| Displacement | 2,134 cc (2.134 L) 2,995 cc (2.995 L) 2,991 cc (2.991 L) |
| Cylinder bore | 77 mm (3.0 in) 78.5 mm (3.1 in) |
| Piston stroke | 38.2 mm (1.5 in) 53.6 mm (2.1 in) 51.5 mm (2.0 in) |
| Valvetrain | 48-valve (four-valves per cylinder), DOHC |
| Compression ratio | 11.0:1-12.0:1[1] |
| Combustion | |
| Turbocharger | KKK Twin-turbocharged (Sports cars) Naturally aspirated (Formula 1 cars) |
| Fuel system | Mechanical fuel injection (Sports cars) Electronic fuel injection (Formula 1 cars) |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 520–640 hp (388–477 kW; 527–649 PS) |
| Torque output | 227–347 lb⋅ft (308–470 N⋅m) |
| Dimensions | |
| Dry weight | 175 kg (385.8 lb) |
| Chronology | |
| Predecessor | Tipo 33 engine |
| Successor | 890T |
Alfa Romeo made a series of 2.1-litre to 3.0-litre, naturally-aspirated and turbocharged, V-12 and flat-12, Grand Prix and Sports car racing engines designed for Formula One, the World Sportscar Championship, Can-Am, the Nordic Challenge Cup, and Interserie; starting in 1973, with their Alfa Romeo 33TT12 Group 5 sports car.[2] This was followed by the twin-turbocharged Alfa Romeo 33SC12 Group 6 engine in 1976,[3][4][5] and shortly after, Brabham as an engine supplier in 1976; before entering Formula One themselves in 1979. Their first was a Carlo Chiti-designed Alfa Romeo flat-12 engine (essentially a 180° V-12) which had been used earlier in the Alfa Romeo 33TT12 and 33SC12 sports cars. In 1976 this engine was supplied to Brabham and the deal continued until 1979. The engine was dubbed the 115-12, and was a 180° V12 engine; essentially making it a flat-12 engine.[6][7][8] Their second 12-cylinder engine, dubbed the 1260, debuted at the 1979 Italian Grand Prix. This time, the engine configuration was a conventional 60° V-12, rather than a flat layout.
- ^ "Specifications of 50 famous racing engines up to 1994 - Page 17 - F1technical.net".
- ^ "Engine Alfa Romeo • STATS F1". statsf1.com. Retrieved 2021-10-11.
- ^ "Tipo 33 SC 12 Turbo".
- ^ "Alfa Romeo Tipo 33 TT 12". 18 October 2019.
- ^ "Alfa Romeo Tipo 33/SC/12". 10 February 2021.
- ^ "1979 Alfa Romeo V12 Formula 1 Engine - Tipo 1260". silodrome.com. 28 February 2018. Retrieved 2021-10-11.
- ^ "Bonhams : An F1 1979 Alfa Romeo Tipo 1260 V12 Engine No. 22, together with Transaxle". bonhams.com. Retrieved 2021-10-11.
- ^ "The Ex Adrea de Cesaris 1982 Alfa Romeo 182" (PDF). 2015-06-18. Retrieved 2021-10-11.