Alfa Romeo V6 engine
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| Alfa Romeo V6 engine | |
|---|---|
 Alfa Romeo 3.0 V6 24V |
|
| Manufacturer | Alfa Romeo |
| Type: | S/DOHC 60° 2/4-valve V6 |
| Production: | 1979–2005 |
| Successor: | JTS engine |
| Displacement: | 2.0 L (1997 cc/122 in³) 2.5 L (2492 cc/152 in³) 3.0 L (2959 cc/181 in³) 3.2 L (3179 cc/194 in³) |
| Dry weight: | 375 lb (170 kg) Alfa Romeo SOHC V6[1] |
| Block alloy: | aluminium alloy |
| Head alloy: | aluminium alloy |
| Fuel type: | Petrol |
| Cooling system: | Watercooled |
| Power output: | 97 kW (132 PS) - 184 kW (250 PS) |
| Compression ratio: | 8.00:1 - 10.50:1 |
Alfa Romeo's in-house V6 engine design made its initial debut in 1979 in the Alfa 6, eventually attaining fame under the hood of the 164 sedan/saloon. Introduced in 2.5 L guise, production engines would eventually range from 2.0 liters to 3.2 liters in displacement. With modifications it is possible to increase engine displacement to 3.8 L. Initially developed in the early 1970's by Giuseppe Busso, the original SOHC 12-valve design employed short push-rods to operate the exhaust valves in a design similar to that of the earlier BMW/Bristol engines. In 1993, the first DOHC version of this engine appeared powering the Alfa Romeo 164.
The V6 production ended in 2005,[2] replaced in the 159 and Brera by a new 3.2 L V6 unit combining a General Motors-designed engine block with Alfa-Romeo cylinder heads and induction. While the GM-based unit benefits from newer technology, including variable inlet and exhaust valve timing, it has proven to be unpopular with enthusiasts. This is attributable in part to the newer engines nondescript appearance and General Motors heritage. Enthusiasts also argue that the traditional, and well-loved, Alfa V6 engine note has been lost.
Contents |
[edit] 2.0
A 2.0 L (1997 cc/122 in³) version was introduced in 1983. Both carburettor (135 hp, 100 kW) and fuel injected versions were available from the start. A 2.0 turbocharged version, derived from the 3.0 L 12v, was introduced in 1991 in the Alfa Romeo 164 with 210 hp (156 kW).
Applications:
- 1983–1986 Alfa Romeo Alfa 6
- 1984–1987 Alfa Romeo 90
- 1991–1992 Alfa Romeo 164 (2.0 L turbo)
- 1995–2005 Alfa Romeo GTV & Spider (2.0 L turbo)
- 1998–? Alfa Romeo 166 (2.0 L turbo)
[edit] 2.5
The original engine displaced 2.5 L (2492 cc/152 in³) and produced 154 hp (115 kW). It was a 2-valve per cylinder design with a single belt-driven camshaft per cylinder bank and six carburettors fitted.
Fuel injection was added for the 1983 Alfa 6, which produced 158 hp (116 kW). The 2-valve engine ended its life in the Alfa 155, where in its final incarnation it produced 166 hp (163 bhp/120 kW).
Applications:
- 1979–1986 Alfa Romeo Alfa 6
- 1980–1986 Alfa Romeo GTV6
- 1984–1987 Alfa Romeo 90
- 1985–1991 Alfa Romeo 75/Milano
- 1992–1997 Alfa Romeo 155
- 1985–1996 Fiat Croma
[edit] Four-valve
A four-valve version was introduced in 1997 with Alfa Romeo 156. The engine now produced 190 hp (140 kW). In 2001, the V6 was uprated to 192 hp (141 kW). The 166 used a slightly detuned version to make more low rev torque. This engine version was awarded as the International Engine of the Year in 2000. The engine has a 88 mm (3.5 in) bore and a 68.3 mm (2.69 in) stroke.[3]
Applications:
- 1997–2005 Alfa Romeo 156
- 1998–2007 Alfa Romeo 166
[edit] 3.0
The 2.5 L engine was bored and stroked out to 3.0 L (2959 cc/180 in³) for the 1987 75/Milano Verde, where it produced 183 hp (136 kW), still with 2 valves per cylinder. This engine was modified for transverse placement in the 164 and fitted with a high-performance camshaft and low-restriction exhaust, producing 200 hp (149 kW).
Applications:
- 1987–1991 Alfa Romeo 75/Milano
- 1989–1991 Alfa Romeo SZ
- 1984–1994 Lancia Thema
- 1986–1992 Alfa Romeo 164
- 1995–2005 Alfa Romeo GTV & Spider
[edit] Four-valve
The engine was upgraded to dual overhead cams and four valves per cylinder in 1993. Along with other refinements, this engine produced 210 hp (157 kW) and 198 ft·lbf (268 N·m) for the regular 1993 164 and 232 hp (172 kW) and 202 ft·lbf (274 N·m) in the 164 Quadrifoglio.
Applications:
- 1993–1996 Alfa Romeo 164
- 1995–2003 Alfa Romeo GTV & Spider
- 1998–2005 Alfa Romeo 166
- 1994–2001 Lancia Kappa
- 1998–present Gillet Vertigo
[edit] 3.2
In 2002 Alfa Romeo introduced the 156 GTA with a 3.2 L (3179 cc/194 in³) version of the V6 with 250 hp (184 kW) and 221 ft·lbf (300 Nm) of torque. Later this engine was also used in the Alfa Romeo 166, GTV, Spider and Alfa Romeo GT in a slightly detuned form (240 hp, 179 kW). The engine has a 93 mm (3.7 in) bore and a 78 mm (3.1 in) stroke.[4]
Applications:
- 2002–2005 Alfa Romeo 156 GTA
- 2002–2005 Alfa Romeo 147 GTA
- 2004–2007 Alfa Romeo GT
- 2003–2005 Alfa Romeo 166
- 2003–2005 Alfa Romeo GTV & Spider
- 2001–2006 Lancia Thesis
[edit] Notes
- ^ Jan Norbye (1981). Engine Weight FYI. Complete Handbook of Automotive Power Trains. Retrieved on 2007-12-20.
- ^ News 25.02.2005. italiaspeed.com. Retrieved on 2008-01-07.
- ^ TECHNICAL SPECIFICIFICATIONS. alfisti.ru. Retrieved on 2008-01-28.
- ^ Alfa Romeo 147 GTA. www.italiaspeed.com. Retrieved on 2008-01-28.
