Alfa Romeo Alfa 6

The Alfa Romeo Alfa 6 (internally coded as Tipo 119) emerged in the late 1970s with the mission of re-establishing the Italian brand in the luxury sedan market. Since the discontinuation of the 2600 model in 1969, the Milanese manufacturer had not had a top-of-the-line sedan equipped with a six-cylinder engine. The development of the Alfa 6 began in the early 1970s. The designers' goal was to create a comfortable and fast sedan to compete directly with German rivals in the premium segment.

To reduce costs and development time, the engineering team decided to reuse the central section of the Alfa Romeo Alfetta, which included sharing the sheet metal of the side doors. This sharing is easily visible in the vehicle's side profile, which resembles an Alfetta elongated at the front and rear ends. Although the basic design of the Alfa 6 was completed even before the launch of the Alfetta, the project suffered major delays. The global oil crisis of 1973 and the social and political conflicts in Italy, known as the "Years of Lead", paralyzed the model's development.

The sedan only hit the market in April 1979. This delay was commercially detrimental: the Alfa 6 was launched amidst the second oil crisis, a period of recession in which the European market for large, fuel-hungry sedans was in sharp decline. In addition, the Italian market applied a heavy tax rate of 38% on cars with engines over 2.0 liters, which limited the initial sales of the 2.5-liter model in its home country. Despite these barriers, the vehicle's refinement and imposing presence, affectionately nicknamed "Alfone" in Italy, led to it being adopted as an official vehicle by the Italian government and the Vatican.

Unlike other contemporary models from the brand that used the transaxle system (where the gearbox and clutch are mounted on the rear axle to balance the weight), Alfa Romeo chose a more traditional mechanical configuration for the Alfa 6. The engine and gearbox were installed longitudinally in the front, while the limited-slip differential with 25% slip was positioned on the rear axle. This decision prioritized the sound insulation and ride comfort demanded by luxury sedan buyers.

Suspension and Braking Systems

The front suspension utilized independent wheels with torsion bars, while the rear adopted the sophisticated De Dion tube system. The brakes were discs on all four wheels, with an important technical detail: the rear discs were mounted internally ("inboard"), positioned directly at the differential output rather than at the wheels. This solution reduced the unsprung weight (the weight of the parts that move with the wheels), allowing the rear suspension to track ground irregularities much more precisely. The downside was the complex maintenance and difficult access for changing pads and discs.

Steering and Transmission

The Alfa 6 was the first Alfa Romeo automobile to come factory-equipped with a power steering system, developed by the renowned German brand ZF. Customers could choose from three types of transmission:

• A five-speed manual gearbox with a traditional shift pattern.
• A ZF S5-18/3 five-speed manual gearbox with a "dog-leg" pattern, where first gear engages backward and to the left, leaving the most frequently used gears (second and third) aligned in the center for quick shifts.
• A three-speed automatic transmission, also supplied by ZF.

In terms of active safety, the sedan featured an innovative inertial impact sensor located in the trunk. In the event of an accident, this device immediately cut power to the electric fuel pump, drastically reducing the risk of leaks and fires.

The following table presents the main physical dimensions and weights of the Alfa Romeo Alfa 6 throughout its production:

For mechanical engineering enthusiasts, the table below details the gear ratios of the famous ZF S5-18/3 manual gearbox used in the model:

The Alfa Romeo Alfa 6 was the model chosen to debut one of the most famous engines in automotive industry history: the V6 designed by engineer Giuseppe Busso.

The Original 2.5-Liter Busso V6

In its first version, of 2,492 cc, the V6 engine featured a refined construction, utilizing an aluminum alloy block and cylinder heads, and liquid sodium-filled exhaust valves to optimize thermal cooling. The valve train adopted a very particular hybrid design: there was only a single overhead camshaft (SOHC) for each cylinder bank, which directly actuated the intake valves. For the exhaust valves, the camshaft lobe pushed a horizontal tappet which, in turn, actuated a short pushrod crossing the cylinder head to a mechanical rocker arm. This creative engineering allowed the cylinder head to remain narrow and compact, maintaining a highly efficient hemispherical combustion chamber.

In the first series of the vehicle (1979 to 1982), fuel delivery was handled by a system of six individual single-barrel Dell'Orto FRPA 40 carburetors. Although it generated an exciting throttle response and a full-bodied sound, tuning six independent carburetors was extremely labor-intensive, requiring specialized mechanics to prevent malfunctions.

Simplified diagram of the hybrid valve actuation (SOHC / Pushrod):
[Camshaft] ───> directly actuates ───> [Intake Valve]
           └───> pushes ───> ───> [Pushrod] ───> ───> [Exhaust Valve]

Second Series Updates: Electronic Injection, 2.0 Version, and Turbodiesel

With the arrival of the second series in 1983, Alfa Romeo retired the complex carburetors of the 2.5 engine and adopted the modern Bosch L-Jetronic multi-point electronic injection system. This change permanently solved the cold start difficulties and the need for constant adjustments, maintaining the same 158 horsepower output.

To expand the sedan's market share and bypass the high taxation on large engines in the Italian market, the manufacturer introduced two more engine options:

• 2.0 V6 Engine (Gasoline): With 1,997 cc, this smaller version of the Busso engine reduced power to 135 horsepower. Curiously, it retained the system of six single-barrel Dell'Orto carburetors to keep production costs viable for the domestic market.
• 2.5 Turbodiesel Engine: Produced by the Italian VM Motori (model HR588), this 2,494 cc inline-five engine generated 105 horsepower and delivered a great torque of 206 N·m at just 2,400 rpm. With a cast-iron block, individual light-alloy cylinder heads for each cylinder, and indirect fuel injection, the powerplant guaranteed excellent range for the vehicle, although it added extra weight to the front and altered cornering agility.

The Alfa Romeo Alfa 6 was produced in two well-defined phases. Each had its own visual identity and specific equipment packages.

First Series (1979 to 1982)

The initial series exhibited sober lines, typical of the 1970s. The front end stood out with its four circular headlights framed by chrome details. The rearview mirrors were electrically operated, and the trims were chrome. The cabin featured comfortable seats in velour fabric and a dashboard with details that harkened back to Alfa Romeo's traditional style.

Second Series (1983 to 1986)

To update the sedan's design against European competition, Alfa Romeo hired the famous Bertone design studio to design a complete facelift. The restyling brought the following changes:

• Exterior: The four round headlights were replaced by large, single rectangular headlights with wide lenses. The front grille was redesigned with dark grey plastic, the metal bumpers were swapped for more wraparound injected plastic pieces, and the taillights received new trim bezels. The chrome trims were eliminated to give the sedan a cleaner, more modern look.
• Interior: The dashboard was slightly modified to improve ergonomics. The interior finish materials were upgraded, featuring high-quality fabrics like luxury corduroy, Alcantara, or optional genuine leather upholstery.

The top-of-the-line version, called Quadrifoglio Oro (Gold Cloverleaf), was equipped with the electronic injection 2.5 V6 engine and featured an extraordinary luxury package for the time. It left the factory with integrated air conditioning, power height and tilt-adjustable front seats, power windows on all doors, central locking, a trip computer, power rear window blinds, magnesium alloy wheels, and a premium sound cassette radio.

Below are listed the detailed specifications for performance, powertrain, and the number of units manufactured for each model:

Production of the Alfa Romeo Alfa 6 was permanently ended in 1986. During the vehicle's final years on the market, the manufacturer introduced the Alfa Romeo 90 (launched in 1984), which positioned itself between the Giulietta and the Alfa 6, utilizing the Alfetta's transaxle chassis but leveraging the modern V6 engines originating from the Alfa 6.

The true spiritual successor to the Alfa 6 was the acclaimed Alfa Romeo 164, launched in 1987. The 164 marked a revolution for the company by adopting front-wheel drive and a much more modern aerodynamic design, the result of the joint platform project developed with the Fiat group (which included the Fiat Croma, Lancia Thema, and Saab 9000).

The great legacy of the Alfa 6 in automotive history does not lie in its modest sales of 12,070 units, but rather in the fact that it was the cradle of development for the legendary Busso V6 engine. This engine family was refined over almost 30 years, undergoing profound mechanical updates, 24-valve cylinder heads with double overhead camshafts (DOHC), and versions with up to 3.2 liters of displacement. The Busso engine gave soul and sportiness to iconic models such as the GTV6, the Alfa 75, the 164, the 156, the 166, and the sporty GTA versions, being considered by enthusiasts worldwide as one of the most charismatic, musical, and exciting engines ever manufactured.