Alfa Romeo 12-cylinder engine

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.

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