The Alfa Romeo 940 B5.000 – Petrol is a 2,492 cc, inline — five, naturally aspirated engine produced between 1987 and 1993. It was developed as a smooth, refined powerplant for Alfa Romeo's executive saloon and sport wagon platforms, featuring a twin — spark (Bussola) ignition system, belt — driven SOHC, and multi — point fuel injection. In standard tune, it delivered 118 kW (160 PS) and 206 Nm of torque, with balanced firing intervals contributing to reduced vibration and en…
Production years 1987–1989 meet Euro 0 standards; 1990–1993 models comply with Euro 1 (VCA UK Type Approval #VCA/EMS/6789).
The Alfa Romeo 940 B5.000 – Petrol is a 2,492 cc inline-five, naturally aspirated engine engineered for executive saloons (1987–1993). It combines twin-spark ignition with multi-point fuel injection to deliver smooth, refined performance. Designed to meet Euro 1 emissions standards in later builds, it balances touring capability with everyday usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,492 cc | |
Fuel type | Petrol | |
Configuration | Inline-5, SOHC, 10-valve, twin-spark | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 81.6 mm | |
Power output | 118 kW (160 PS) @ 5,700 rpm | |
Torque | 206 Nm @ 3,500 rpm | |
Fuel system | Bosch Motronic with twin-spark ignition | |
Emissions standard | Euro 0 (pre-1990); Euro 1 (1990–1993) | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Single cam belt with hydraulic tensioner | |
Oil type | SAE 10W-40, API SL/CF | |
Dry weight | 162 kg |
The Alfa Romeo 940 B5.000 – Petrol was used across Alfa Romeo's 164 platform with longitudinal mounting and shared architecture with Lancia models in select European markets. This engine received platform-specific adaptations-shorter intake manifolds in the 164 and revised exhaust routing in the 164 LS-and from 1990 the updated 164 Series 2 models adopted improved emissions controls, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The 940 B5.000 – Petrol's primary reliability risk is cam belt failure on early builds, with elevated incidence in high-temperature or neglected maintenance conditions. Internal Alfa Romeo service data from 1991 reported a significant number of pre-1990 engines suffering belt-related damage before 80,000 km, while VCA field reports link timing failures to delayed servicing. Extended intervals and coolant leaks increase belt slippage and degradation, making timely replacement and tensioner inspection critical.
Analysis derived from Alfa Romeo technical bulletins (1987–1993) and UK DVSA failure statistics (1990–1995). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 940 B5.000 – Petrol offers smooth performance and refined character, but early models (1987–1989) are prone to cam belt failures if maintenance is delayed. Later revisions (post-1990) improved belt and tensioner durability. When properly maintained—with timely belt changes and quality oil—these engines can exceed 180,000 km. Twin-spark ignition and cooling system upkeep are essential for long-term reliability.
The most frequent issues include cam belt/tensioner failure, twin-spark ignition misfires, vacuum leaks from intake hoses, and oil seepage at the valve cover or rear main seal. These are documented in Alfa Romeo service bulletins and supported by field repair data. Regular inspection of the timing cover for coolant traces and spark plug condition helps prevent major failures.
This 2.5L petrol engine was used in the Alfa Romeo 164 2.5 and Lancia Thema 2.5. It served as the base petrol variant in the 164 lineup before the introduction of the V6. Production spanned 1987–1993, with Euro 1 compliance in later models. The engine shared design principles with the 3.0 V6 used in higher-trim 164 models.
Yes, though within moderate limits. Performance camshafts, free-flow exhaust, and intake upgrades can yield +15–25 PS. The twin-spark system supports slightly higher revs, but stock internals limit aggressive tuning. ECU remapping is not applicable due to analog Motronic fuel management. Classic tuning focus is on throttle response and mid-range torque rather than peak power.
Moderate for its era. In an Alfa Romeo 164 2.5 (1989), combined consumption is approximately 11.2 L/100km (~25 mpg UK). Highway driving can achieve ~8.5 L/100km (~33 mpg UK), while city use may exceed 13 L/100km (~22 mpg UK). Real-world figures depend on driving style and maintenance; a well-tuned engine delivers consistent efficiency.
Yes. The 940 B5.000 – Petrol is an interference engine. If the cam belt fails or jumps timing, pistons can collide with open valves, resulting in bent valves or cylinder head damage. This makes strict adherence to the 60,000 km replacement interval absolutely critical. Any signs of belt noise or coolant near the timing cover require immediate inspection.
Alfa Romeo specifies SAE 10W-40 mineral or semi-synthetic oil meeting API SL/CF standards. Use of high-quality oil ensures proper lubrication of the valve train and timing components. Change intervals should not exceed 15,000 km or 12 months. Regular oil changes help prevent sludge buildup and maintain optimal performance in this high-heat engine.
Comprehensive technical documentation and regulatory references
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ALFA-ROMEO Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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