The Alfa RomeoV6 engine was a 60° V6 engine made by Alfa Romeo from 1979 to 2005. It was developed in the early 1970s by Giuseppe Busso, and used on the Alfa 6 with a displacement of and a SOHC 12-valve cylinder head. Later versions ranged from and had DOHC 24-valve valvetrains. The original design had short pushrods for the exhaust valves in a design similar to earlier Lancia Fulvia engines. The first DOHC version was in the 1993 Alfa Romeo 164, with an aluminium alloyengine block and head with sodium filled exhaust valves. The Alfa Romeo V6 has been used in kit cars like the Ultima GTR, Hawk HF Series, and DAX, as well as the Gillet Vertigosports car. In August 2011EVO magazine wrote that "the original Alfa Romeo V6 was the most glorious-sounding six-cylinder road engine ever," The Alfa Romeo V6 engine has also been used in ice resurfacer made by engo Ltd. in Italy.
12V, two valve
2.0
A version was introduced in 1983. Both carburetted and fuel-injected versions were available from the start. Applications:
A turbocharged version, derived from the 3.0 L 12v, first with total digital management, was introduced in 1991 in the Alfa Romeo 164 with. The engine has a bore and stroke of. Applications:
The original engine displaced and produced. It was a 2-valve-per-cylinder design with a single belt-driven camshaft per cylinder bank and six carburettors. The engine has a bore and stroke of. The BoschL-Jetronicfuel injection was added for the 1983 Alfa 6, which produced the same. The 2-valve engine ended its life in the Alfa 155, where there were two series for this engine, the developing. Differences between them were small and only on torque and power delivery producing exactly the same horsepower. Applications:
In 1982, the German Alfa Romeo dealer and tuner Gleich offered a 2.8 conversion of the GTV6 2.5 engine. Dieter Gleich was sure that engine displacement enlargement is still the best and, for the life of the engine, the healthiest way of tuning. The engine capacity was increased to nearly 2.8 liters by using new bushings and custom-built forged Mahle pistons while the compression ratio was raised from 9.5 to 10.5:1. The 2.5 liter was rebored to. Total displacement was. Power produced were at 6,300 rpm and torque at 4200 rpm. The magazine "Sport driver" tested a 2.8 Gleich powered GTV6 in June 1982:
"After engaging the first gear and a somewhat careless step on the gas pedal you get a touched feel to the epiphany GTV6 shot, accompanied by the typical Alfa Romeo exhaust sound. It was a pleasure. The fact was the sprint from 0 to is not further under the seven-second limited by a tricky-to-be-shifted five-speed gearbox. The really vehement propulsion waned only when the speedometer mark has left behind. Another eye-opening experience awaits when you realize that the lightning speed to 7000 rpm rotating in any gear pinion even in fifth gear still from 1500 rpm is completely smooth."
The original 2.5 engine as used in the Alfa 6 was bored and stroked by Autodelta, the former Alfa Romeo racing department to match the racing rules for South African and Australian championships. Bore was increased from to and a new crankshaft stroked to. The total displacement was and it's a totally different engine from the later that powered the 75/Milano models. It was, too, a 2-valve-per-cylinder design with a single belt-driven camshaft per cylinder bank and six carburettors. Special camshafts and carbs were used giving a power figure of at 5800 rpm. Torque was at 4300 rpm, while compression ratio was 9:1. Only 174 complete GTV6 3.0 SA cars were produced in 1984 plus 68 more in 1985. the last ones were fitted with EFI. The 3.0 GTV6 was sold in South Africa in 1983-1985, predating the release of the 3.0 L displacement to the rest of the world. This engine was an Autodelta hand made conversion based on Alfa Sei 2.5 carburated engines enlarged to bore and stroke of. Applications:
Pulled by the racing success of the 3.0 SA engine and looking for more power to boost 75/Milano sales in countries like USA, Alfa Romeo introduced a production version of the 3.0 engine. Bore was, as the 3.0 SA, but stroke was increased to. The total displacement was. As the previous engines, it was a 2-valve-per-cylinder design with a single belt-driven camshaft per cylinder bank. The main difference with the racing 3.0 SA was the use of modern L-Jetronic fuel injection system by Bosch. Power figures vary from to at 5800 rpm, with compression ratio 9:1. This engine was modified for transverse placement in the 164 and fitted with a high-performance camshaft and low-restriction exhaust, producing in standard form, when a catalyzer was added in 1991, with the Cloverleaf version producing. The same engine was fitted to the SZ and RZ - ES30 Zagato, but even more finely tuned with wilder cams and high compression pistons to a further. Applications:
A four-valve version was introduced in 1997 with the Alfa Romeo 156. The engine now produced. In 2001, the V6 was uprated to. 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 bore and stroke of, the same as the two-valve. Applications:
1996–2005 Alfa Romeo 156
1996–2007 Alfa Romeo 166
3.0 24V
The engine was upgraded to dual overhead cams and four valves per cylinder in 1993. Due to this and other refinements, this engine produced for the regular 1993 Alfa Romeo 164, with and in the 164 QV with its engine producing on the Q4 model which in its final production run in 1996, it got reduced to but with increased torque. The final run of 3.0 V6 engines in the GTV, Spider and 166 range, produced in the Euro 3-compliant version. The engine has a bore and stroke of, the same as the two-valve. Applications:
In 2002 Alfa Romeo introduced the 156 GTA with a version of the V6 with and of torque. Later this engine was also used in the Alfa Romeo 166, GTV, Spider and Alfa Romeo GT in a slightly detuned form. The engine has a bore and stroke. In Lancia this engine produced. Applications:
The V6 production ended in 2005 at Alfa Romeo Arese Plant; a stock of five thousand were built, to be used in Lancia Thesis, Alfa 166 and Alfa GT models. The engine was 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. British automotive engineering company Cosworth was keen to buy assembly lines of the Alfa Romeo V6 engine, but the Italian company did not want to sell it. The last version of 3.2 L engine was Euro4 compliant, so it would have been possible to produce it a couple of years more. The engine's designer Giuseppe Busso died within couple of days after the last engine was produced in Arese. Since 2015, Fiat Powertrain manufactures the all-new, Ferrari-derived 90° V6 Biturbo engine for the Giulia Quadrifoglio and Stelvio Quadrifoglio.
