The Alfa Romeo 940 B6.000 – Petrol is a 2,492 cc, inline — four, naturally aspirated engine produced between 1987 and 1993. It was developed as a refined, mid — range powerplant for Alfa Romeo's executive sedan lineup, featuring a dual overhead camshaft (DOHC) layout and Bosch Motronic electronic fuel injection. It delivered 110 kW (150 PS) at 5,600 rpm and 206 Nm of torque at 3,500 rpm, emphasizing smooth power delivery and drivability in urban and highway conditions.
Prima…
Production years 1987–1991 meet Euro 0 standards; 1992–1993 models comply with Euro 1 .
The Alfa Romeo 940 B6.000 – Petrol is a 2,492 cc inline-four naturally aspirated engine engineered for mid-size sedans (1987–1993). It combines DOHC valvetrain architecture with Bosch Motronic fuel injection to deliver smooth power delivery and responsive mid-range performance. Designed to meet evolving emissions standards, later models achieved Euro 1 compliance through catalytic converter integration and oxygen sensor feedback control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,492 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 93.0 mm × 92.0 mm | |
Power output | 110 kW (150 PS) @ 5,600 rpm | |
Torque | 206 Nm @ 3,500 rpm | |
Fuel system | Bosch Motronic M1.5 electronic fuel injection | |
Emissions standard | Euro 0 (pre-1992); Euro 1 (1992–1993) | |
Compression ratio | 9.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (single-row, tensioner-equipped) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Alfa Romeo 940 B6.000 – Petrol was used across Alfa Romeo's M105 platform with transverse mounting and no licensed external applications. This engine received platform-specific adaptations—tuned intake manifolds for improved low-end torque in European 75 2.5i models—and from 1991 the updated ignition coil pack addressed thermal degradation issues, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 B6.000 – Petrol offers smooth performance and solid build quality, but pre-1991 models are prone to ignition coil degradation if exposed to sustained high temperatures. Later units with updated coils are more durable. Consistent oil changes with correct 10W-40 oil and attention to sensor health are essential for longevity. Well-maintained examples can exceed 150,000 km.
Key issues include ignition coil pack failure (especially pre-1991), timing chain tensioner wear, Bosch Motronic injection faults (coolant sensor, ECU), and coolant leaks from thermostat housing. These are documented in Alfa Romeo service bulletins and observed in long-term owner reports.
This engine was used exclusively in the Alfa Romeo 75 (sold as Milano in North America) from 1987 to 1993. It powered the 2.5i and Milano 2.5i variants. No other Alfa Romeo production models used this specific DOHC 2.5L petrol variant.
Yes, but within limits. Performance camshafts, free-flow exhaust, and intake upgrades can yield +10–20 kW. ECU remapping is possible on Bosch Motronic systems, though gains are modest. High-RPM reliability depends on maintaining oil system integrity and using high-quality components. Over-tuning may compromise drivability and emissions compliance.
Moderate. In the Alfa Romeo 75 2.5i, combined consumption is approximately 10.8 L/100km (26 mpg UK). City driving may reach 13 L/100km (22 mpg), while highway cruising can achieve 8.5 L/100km (33 mpg). Driving style significantly impacts real-world figures due to the engine’s emphasis on mid-range responsiveness.
Yes. The 940 B6.000 – Petrol is an interference engine. If the timing chain fails or jumps, piston-to-valve contact is likely, resulting in severe internal damage. Maintaining the timing system and addressing chain noise promptly is critical to avoid costly repairs.
Alfa Romeo specifies SAE 10W-40 oil meeting API SH/CD standards. Use a high-quality mineral or semi-synthetic oil designed for naturally aspirated petrol engines. Change oil every 15,000 km or annually to ensure proper lubrication and prevent premature wear.
Comprehensive technical documentation and regulatory references
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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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