The Lancia 831 B3.000 is a 1,995 cc, inline‑four petrol engine produced between 1985 and 1992. It features a twin‑cam (DOHC) cylinder head and mechanical fuel injection, delivering a balance of performance and refinement for its era. The engine's dual overhead camshafts enable precise valve control for responsive power delivery.
Fitted primarily to the Lancia Thema 8.32 model, the 831 B3.000 was engineered for spirited driving and grand touring comfort. It was derived…
Production years 1985–1992 predate standardized Euro emissions regulations. Compliance was governed by national standards of the time (e.g., Italian Ministry of Transport directives).
The Lancia 831 B3.000 is a 1,995 cc inline‑four petrol engine engineered for premium sedans (1985-1992). It combines a Ferrari-derived DOHC cylinder head with Bosch L-Jetronic fuel injection to deliver a high-revving, responsive character. Designed for performance, it prioritizes driver engagement over modern economy standards.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 90.0 mm × 78.3 mm | |
Power output | 107 kW (145 PS) @ 5,800 rpm | |
Torque | 186 Nm @ 4,500 rpm | |
Fuel system | Bosch L-Jetronic | |
Emissions standard | Pre-Euro (National Standards) | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven (interference design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | Not available in OEM documentation |
The Lancia 831 B3.000 was used exclusively in the Lancia Thema platform with longitudinal mounting and was not licensed to other manufacturers. This engine was a unique feature of the high-performance Thema 8.32 variant, creating a distinct model line. All adaptations are documented in OEM technical bulletins.
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The 831 B3.000's primary reliability risk is timing belt failure, with catastrophic consequences if neglected. Lancia service bulletins mandate a 60,000 km or 4-year replacement interval. The engine's high-revving nature and age make adherence to this schedule and using correct ignition components critical.
Analysis derived from Lancia technical bulletins (1985-1992) and workshop manuals. 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 831 B3.000 can be reliable if meticulously maintained, especially regarding the timing belt. Its Ferrari-derived design is robust but complex. Neglecting the 60,000 km/4-year belt change risks total engine destruction. Regular servicing of the ignition and fuel systems is also crucial for longevity.
The most critical issue is timing belt failure. Other common problems include ignition system faults (coils, distributor), L-Jetronic fuel injection issues (sensors, vacuum leaks), and cooling system leaks from aging hoses and the water pump. All are well-documented in Lancia service literature.
The 831 B3.000 engine was used exclusively in the Lancia Thema 8.32 model from 1985 to 1992. It was not fitted to any other Lancia vehicle or licensed to other manufacturers, making the Thema 8.32 a unique and collectible model.
Yes, but gains are limited. Modifications include performance air filters, free-flow exhausts, and ECU chip tuning for the L-Jetronic system. Significant power increases require internal engine work. Most owners focus on preserving originality rather than tuning this rare engine.
Fuel economy is modest by modern standards. Expect around 12-14 L/100km (20-17 mpg UK) in mixed driving. Its performance-oriented design and age prioritize power and character over efficiency, especially when driven enthusiastically.
Yes, absolutely. This is its most critical characteristic. If the timing belt breaks or slips, the pistons will collide with the open valves, causing severe and expensive internal engine damage. Strict adherence to the replacement schedule is mandatory.
Lancia specified SAE 10W-40 mineral or semi-synthetic oil. A modern, high-quality 10W-40 that meets API SF/CC or higher specifications is suitable. Regular oil changes (every 10,000 km or annually) are essential for engine health.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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