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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
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. This was followed by the twin-turbocharged Alfa Romeo 33SC12 Group 6 engine in 1976, 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. 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.

Applications

Formula 1 cars

• Brabham BT45
• Brabham BT46
• Alfa Romeo 177
• Alfa Romeo 179
• Alfa Romeo 182

Sports cars

• Alfa Romeo Tipo 33

References

1. "Specifications of 50 famous racing engines up to 1994 - Page 17 - F1technical.net".
2. "Engine Alfa Romeo • STATS F1". statsf1.com. Retrieved 2021-10-11.
3. "Tipo 33 SC 12 Turbo".
4. "Alfa Romeo Tipo 33 TT 12". 18 October 2019.
5. "Alfa Romeo Tipo 33/SC/12". 10 February 2021.
6. "1979 Alfa Romeo V12 Formula 1 Engine - Tipo 1260". silodrome.com. 28 February 2018. Retrieved 2021-10-11.
7. "Bonhams : An F1 1979 Alfa Romeo Tipo 1260 V12 Engine No. 22, together with Transaxle". bonhams.com. Retrieved 2021-10-11.
8. "The Ex Adrea de Cesaris 1982 Alfa Romeo 182" (PDF). 2015-06-18. Retrieved 2021-10-11.
9. "Alfa Romeo Tipo 33 TT 12".
10. "1973 - 1975 Alfa Romeo 33/TT/12 - Images, Specifications and Information".
11. "1975 Alfa Romeo Tipo 33 TT 12". 27 July 2008.
12. "Alfa Romeo Tipo 33 - Car Profile". 21 March 2008.
13. "1974 Alfa Romeo 33 TT 12 technical and mechanical specifications".
14. "1974 Alfa Romeo Tipo 33 TT 12".
15. "1974 Alfa Romeo Tipo 33 TT 12". 25 June 2021.
16. "The Alfa Romeo 33SC12 Makes a Furious Flat-12 Noise". 10 April 2019.
17. Collins, Peter; McDonough, Ed (18 March 2006). Alfa Romeo Tipo33: The Development, Racing, and Chassis History. ISBN 9781904788713.
18. "Bonhams : 1974 Alfa Romeo Tipo 33 TT 12 Chassis no. AR11512*010* Engine no. 11512 071".
19. "Alfa Romeo 33 Stradale: Eternal Beauty". 26 April 2019.
20. "1977 Alfa Romeo 33/SC/12 Turbo - Images, Specifications and Information".
21. "Alfa Romeo 33SC 12 Turbo Last of the T33s".
22. "1975 Alfa Romeo 33-3 TT12 | Alfa Romeo". 3 April 2016.
23. "Alfa Romeo Tipo 33 SC12 group 6 (1977) - Racing Cars".
24. "Classic: Alfa Romeo Tipo 33 - Winding Road".
25. "Winning Lineage: The Alfa Romeo Tipo 33 Competition Cars". 22 December 2017.

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