Renault Z-Type engine

Française de Mécanique

Company type	Joint venture
Industry	Automotive engineering
Founded	1969
Headquarters	Douvrin , France
Owner	Peugeot, Renault, Volvo Cars (equal ownership)

The V6 PRV engine is a V6 featuring an overhead cam design, developed and produced by Française de Mécanique on behalf of PRV, a collaborative venture between Peugeot, Renault, and Volvo Cars. Manufactured from 1974 through 1998, this engine was available in four displacements ranging from 2.5 L to 3.0 L. It offered both SOHC and DOHC configurations, with either 2 or 4 valves per cylinder. Initially equipped with carburetors, the engine later transitioned to fuel injection systems to meet emission standards and enhance performance. Turbocharged and twin-turbo variants were employed by Renault, Chrysler Motors, and the French sports car manufacturer Venturi.

Following 1994, the PRV V6 was progressively replaced by a jointly developed powerplant from PSA Group (Peugeot’s successor) and Renault, known as the ES engine within PSA and referred to as the L engine by Renault.

Corporate history

In 1966, Peugeot and Renault reached an agreement to collaborate on producing shared components. This partnership led to the establishment of their joint venture, La Française de Mécanique (FM), in 1969, with a manufacturing facility located in Douvrin, northern France. Although PRV engines are occasionally called "Douvrin" engines, that term is more commonly associated with a contemporaneous series of inline-four engines produced at the same plant.

Volvo joined forces with Peugeot and Renault in 1971 to form PRV, a publicly traded company equally owned by the three automakers. Originally intending to develop V8 engines, the consortium shifted focus to smaller V6 units in response to the 1973 oil crisis and taxation policies targeting engines larger than 2.8 liters.

The PRV V6 featured a 90-degree bank angle typical of V8 engines but utilized crankpins spaced at 120 degrees. Renault required this V6 powerplant for its upcoming Renault 30 model (internally designated as Z-Type).

Production tooling arrived at Douvrin in June 1973, with assembly lines completed by January 1974. The initial PRV engines were introduced on 3 October 1974 in the Volvo 264 (B27). By the close of 1975, the PRV V6 was installed in no fewer than five different models.

Volvo employed the B27 engine in their 264/265 series until 1980; later models featured the B28 unit, including the rare 244/245 GLT 6 (1980–83) and the Volvo 760 (1982–86). The final PRV-powered Volvo was equipped with the B280 (1987–90), used in both the Volvo 760 and 780 models, which incorporated significant updates beyond just the engine block. The B280 also saw limited use in certain Volvo 960 models during 1991.

Renault launched the first turbocharged PRV V6 available commercially in 1984 with the Renault 25 V6 Turbo—this second-generation EFI engine adopted an even-fire firing order enabled by split crankpins. Turbocharged versions also powered vehicles like the Renault Alpine GTA V6 Turbo, Alpine A610, and Safrane Bi-turbo, spanning displacements from 2.5 L up to low-compression 3.0 L variants. Naturally aspirated versions up to 3.0 L were utilized across Peugeot, Citroën, and Renault lineups until production ended in 1997.

While Renault concentrated on turbocharging technologies, Peugeot and Citroën developed a multi-valve (24-valve) iteration for their premium offerings such as the 605 and XM models. This variant maintained compression ratios similar to Renault’s earlier 12-valve versions but featured redesigned pistons and cylinder heads aimed at simplifying maintenance procedures. Despite these improvements, the engine was expensive to produce and experienced camshaft wear problems linked to its valve actuation system; these issues were partially resolved by introducing ceramic followers following recall campaigns.

French supercar builder Venturi engineered high-performance versions of the PRV engine: a turbocharged 12-valve 3.0 L unit powering the Atlantique 300; twin-turbocharged, 24-valve variants exceeding power outputs for racing applications such as Le Mans with their 600LM; and a road-legal derivative—the Venturi 400GT—offering substantial performance.

Peugeot supported endurance racing through WM Peugeot by creating a bespoke twin-cam DOHC version of the PRV—the sole DOHC configuration—which set a top speed record at Le Mans in 1988 at before retiring due to engine failure.

Volvo withdrew from the PRV partnership during the late 1980s; its final PRV-powered vehicle was released in model year 1991 before transitioning to inline six-cylinder Modular engines starting with the Volvo 960. Peugeot, Renault, and Citroën continued utilizing PRV engines until production ended on June 15, 1998, after manufacturing more than 970,000 units.

Irregular firing sequence

The design of the V8 engine served as a foundation for the V6 engine architecture, with its cylinder banks positioned at a 90° angle, contrasting with the more typical 60° configuration. While V8 engines utilize a 90° angle to naturally achieve balanced firing order, V6 engines generally rely on a 60° layout for uniform ignition intervals. The PRV’s 90° V6 initially exhibited uneven firing patterns, which were corrected in the second generation (starting in 1984) by implementing split crankshaft journals to ensure consistent firing spacing. This configuration results in a more compact, wider engine design that allows for lower hood profiles. Comparable strategies are found in the odd-fire and even-fire versions of the Buick V6 and Maserati V6 powerplants.

PRV engine variants

• Z6W-A 700: 2849 cc with carburetor, installed in the Renault Alpine V6 GT
• Z7U-702: Employed in the Renault 25 V6 Turbo
• Z7U-730: Turbocharged model for the Renault Alpine V6 Turbo
• Z7X-711 & Z7X-715: Used within the Eagle Premier and Dodge Monaco
• Z7X-726: Bi-turbo variant found in the Renault Safrane
• Z7X-744: Deployed in the Renault Alpine A610
• ZM112: Carbureted version utilized by Peugeot 504
• ZMJ140 & ZMJ-159: Fuel-injected iterations for Peugeot 504 and DMC DeLorean
• ZN3J 154F/X: Bosch LH-Jetronic fuel-injected types for Peugeot 505, including catalytic converter-equipped models
• ZNJK: Fuel-injected version designed for the Peugeot 604
• ZPJ S6A & ZPJ4 SKZ: Multivalve fuel-injected engines applied to the Peugeot 605 and Citroën XM
• B27 series (A/E/F): Carbureted and fuel-injected options used in the Volvo 260
• B28 series (A/E/F): Versions incorporated into both the Volvo 260 and early Volvo 760
• B280E/F: Fuel-injected and reduced compression variants for the Volvo 760, Volvo 780, and initial model year of the Volvo 960 in certain markets

Technical details

Displacement	2,458 cc (150.0 cu in)	2,664 cc (162.6 cu in)	2,849 cc (173.9 cu in)	2,963 cc (180.8 cu in)	2,975 cc (181.5 cu in)
Bore × stroke	91 mm × 63 mm	88 mm × 73 mm	91 mm × 73 mm	93 mm × 72.7 mm	93 mm × 73 mm
Number of valves	12			12 or 24
Engine aspiration	Turbocharged	Naturally aspirated		Naturally aspirated or turbocharged
Compression ratio	8.2–8.6:1	8.8–9.5:1	8.8–10.5:1	9.5:1 7.6:1 (turbo)	9.5:1 7.3–7.6:1 (turbo)
Power output	134–136 kW (182–185 PS; 180–182 bhp) at 5500 rpm	92–110 kW (125–150 PS; 123–148 bhp) at 5500–6000 rpm	95–143 kW (129–194 PS; 127–192 bhp) at 5500–6000 rpm	123–147 kW (167–200 PS; 165–197 bhp) at 5500–6000 rpm 184 kW (250 PS; 247 bhp) at 5000–5750 rpm (turbo)	123–147 kW (167–200 PS; 165–197 bhp) at 5600–6000 rpm 184–300 kW (250–408 PS; 247–402 bhp) at 5750 rpm (turbo)

! Torque ! at 2200–4000 rpm ! at 3000–3500 rpm ! at 2750–4000 rpm ! at 3600–4600 rpm

at 2900 rpm (turbo) ! at 3600–4600 rpm

at 2900 rpm (turbo) |} ! Firing sequence !colspan="5"|1-6-3-5-2-4 |} ! Weight !colspan="2"| – ! kg !colspan="2"| – |}

PRV-Equipped Vehicles

• 2458 cc:
  • Renault Alpine GTA/A610 (1985–1991)
  • Renault 25 (1985–1995)
  • Venturi 180/200/210 (1987–1992)
• 2664 cc:
  • Alpine A310 (1976–1985)
  • Peugeot 504 coupé/cabriolet (1974–1983)
  • Peugeot 604 (1975–1984)
  • Renault 25 (1984–1988)
  • Renault 30 (1975–1984)
  • Talbot Tagora (1980–1983)
  • Volvo 260/264/265 (1974–1980)
  • Volvo 262C (1977–1980)
• 2849 cc:
  • Renault Alpine GTA/A610 (1984–1990)
  • DMC DeLorean (1981–1983)
  • Lancia Thema (1984–1992)
  • Panhard ERC
  • Panhard VCR
  • Peugeot 505 (1986–1992)
  • Peugeot 604 (1979–1985)
  • Peugeot P4
  • Peugeot Proxima (prototype, 1986)
  • Peugeot Oxia (prototype, 1988)
  • Renault 25 (1988–1992)
  • Renault Espace II (1991–1996)
  • UMM Alter II (1990s)
  • Venturi 160 (1987–1992)
  • Venturi Atlantique (1989–1996)
  • Volvo 260/264/265 (1980–1982)
  • Volvo 262C (1980–1981)
  • Volvo 760/780 (1982–1991)
  • Volvo 960 (rare models from 1991)
• 2963 cc:
  • Alpine A610 (1993–1995)
  • Citroën XM (1993–1997)
  • Peugeot 605 (1990–1995)
  • Renault Espace III (1996–1998)
  • Renault Laguna I (1994–1997)
  • Renault Safrane (1992–1997)
• 2975 cc:
  • Alpine A610 (1991–1993)
  • Citroën XM (1989–1993)
  • Dodge Monaco (1990–1992)
  • Eagle Premier (1988–1992)
  • Peugeot 605 (1990–1995)
  • RJ Racing Helem V6 (modified from the Renault Sport Spider) (1995)
  • UMM Alter II (1990s)
  • Venturi Atlantique 300 (1996–1998)
  • Venturi 400 (1994–1997)

PRV Engines in Motorsport

• ALD C289 endurance prototype competing in the 24 Hours of Le Mans (1992)
• Alpine A310 in Group 4 and Group B/12 racing categories
• Alpine A610 GT2 class
• Chevron B36 endurance prototype at the 24 Hours of Le Mans (1987)
• Fouquet buggies
• Peugeot 504 V6 Coupé Rallye Group 4
• Peugeot P4 V6 for Paris Dakar rally
• RJ Racing Helem V6
• Schlesser Original buggy
• UMM Alter II
• Venturi models: 260LM, 400GTR, 500LM, and 600LM
• WM P series prototypes (participated in the 24 Hours of Le Mans from 1976 to 1989), including the P80 which finished fourth in 1980 and the P88 that set the Mulsanne Straight speed record at 407 km/h (253 mph) during the 1988 race
• Ultima Mk1/2/3

The PRV engine architecture also formed the foundation for Alfa Romeo’s 90° V6 powerplant used in the Alfa Romeo 155 V6 Ti starting at Silverstone during the 1996 DTM/ITC season. This unit retained the PRV’s cylinder bore spacing and bank angle, tailored for induction systems within a production-based framework. Alfa Romeo’s choice of this engine was influenced by its application in the Lancia Thema, a model sharing its platform with the Alfa Romeo 164, Fiat Croma, and Saab 9000.

Although some accounts suggest that the Alfa Romeo V6 Ti engine was derived from a modified version of the Montreal’s original 2.6 L V8 engine from 1970, FIA homologation paperwork verifies it was based on a homologated "2850cm³" V6 configuration. The bore spacing of the Montreal’s V8 was incompatible with that of the Alfa Romeo V6 Ti. The narrative regarding a "Montreal V8" origin appears to have been fabricated to mislead media and satisfy FIAT executives wary of utilizing an engine developed outside their corporate group.

See also

• Compilation of engines utilized in Chrysler vehicles

External links

• Renault Alpine Owners Club – Resources about Renault Alpine models equipped with the PRV V6 engine.
• ART – Alpine Renault Tuning – Performance upgrades and tuning components for both turbocharged and naturally aspirated PRV V6 Renault Alpines.
• Peugeot PRV – An older yet valuable source of information.