| 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 | KKKTwin-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 | |
| Length | (V12) 1,790 mm (70 in) (Flat 12) 895 mm (35.2 in) |
| Width | (V12) 665 mm (26.2 in) (Flat 12) 1,000 mm (39 in) |
| Height | (V12) 465 mm (18.3 in) (Flat 12) 225 mm (8.9 in) |
| Dry weight | 143–175 kg (315.3–385.8 lb) |
| Chronology | |
| Predecessor | Tipo 33 engine |
| Successor | 890T |
Alfa Romeo made a series of 2.1-litre to 3.0-litre,naturally-aspirated andturbocharged,V-12 andflat-12,Grand Prix andSports carracingengines designed forFormula One, theWorld Sportscar Championship,Can-Am, theNordic Challenge Cup, andInterserie; starting in 1973, with theirAlfa Romeo 33TT12Group 5 sports car.[2] This was followed by thetwin-turbochargedAlfa Romeo 33SC12Group 6 engine in 1976,[3][4][5] and shortly after,Brabham as an engine supplier in1976; before entering Formula One themselves in1979. Their first was aCarlo Chiti-designed Alfa Romeoflat-12 engine (essentially a 180° V-12) which had been used earlier in theAlfa Romeo 33TT12 and 33SC12 sports cars. In1976 this engine was supplied toBrabham and the deal continued until1979. The engine was dubbed the115-12, and was a 180° V12 engine; essentially making it aflat-12 engine.[6][7][8] Their second 12-cylinder engine, dubbed the1260, debuted at the1979 Italian Grand Prix. This time, theengine configuration was a conventional 60° V-12, rather than aflat layout.
