The Fiat 131 B2.000 is a 1,995 cc, inline — four, naturally aspirated petrol engine produced between 1974 and 1984. It powered the iconic Fiat 131 Mirafiori and Rallye models, delivering robust performance with a twin — choke carburettor or fuel injection in performance variants. Featuring an overhead valve (OHV) configuration and cast — iron block, it produced up to 108 kW (147 PS) in high — compression Rallye form, with strong mid — range torque for spirited driving.
Fitte…
Production years 1974–1979 meet informal European emissions guidelines; 1980–1984 export models comply with Euro 1 standards .
The Fiat B2.000 is a 1,995 cc inline-four OHV petrol engine engineered for mid-size sedans and rally applications (1974–1984). It combines a robust cast-iron block with twin-choke carburetion or fuel injection to deliver responsive mid-range performance. Designed to meet evolving emissions standards, it balances durability with spirited driving characteristics.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, OHV, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 86.0 mm | |
Power output | 82–108 kW (112–147 PS) | |
Torque | 155–186 Nm @ 3,000 rpm | |
Fuel system | Twin-choke carburettor (Weber 40 DCOE) or Bosch L-Jetronic (Rallye) | |
Emissions standard | Pre-regulation to Euro 1 (export models) | |
Compression ratio | 9.2:1 (standard), 10.4:1 (Rallye) | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshaft | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 145 kg |
The Fiat B2.000 was used across Fiat's 131 series platforms with longitudinal mounting and shared with Lancia for select applications in South American markets. This engine received performance adaptations-high-lift camshafts and tuned intake manifolds in the Rallye variant-and from 1978 the facelifted 131 Supermirafiori adopted revised carburettor setups, creating interchange limits. Partnerships allowed Lancia's Delta prototype programme to test B2.000-based powertrains. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
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 Fiat technical bulletins (1974-1984) and UK DVSA historic vehicle inspection data (1980-2023). 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 B2.000 is mechanically robust and well-proven in long-term service, especially in standard-tune form. High-performance Rallye variants require closer attention to valve train and cooling system maintenance. Regular oil changes with correct viscosity (10W-40) and periodic carburettor or fuel system servicing greatly enhance longevity. Well-maintained examples regularly exceed 200,000 km.
Key issues include valve clearance drift, carburettor icing in cold weather, timing chain wear on high-mileage engines, and oil leaks from aged gaskets. Fuel-injected models may experience airflow meter faults or injector clogging. These are documented in Fiat service literature and widely reported in owner clubs and restoration guides.
The B2.000 was used in the Fiat 131 saloon (2.0, 2.0S), estate (Familiare), and performance variants (Rallye, Abarth Rally). It was also tested in Lancia Delta prototypes for South American markets. The engine powered both road and rally versions of the 131, with output varying by tune and fuel system.
Aftermarket ECU tuning is common on the 131-B2-000 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Moderate by modern standards. In a 131 2.0S, consumption averages ~10.5 L/100km (city) and ~7.8 L/100km (highway), or about 27 mpg UK combined. Rallye models with aggressive cam profiles may see higher consumption. Real-world figures depend on driving style, but expect 25–30 mpg (UK) under mixed conditions.
No. The B2.000 uses a non-interference OHV design. If the timing chain fails or skips, the pistons will not contact the valves, preventing catastrophic internal damage. However, the engine will stop running, and continued operation can damage the camshaft and lifters.
Fiat specifies SAE 10W-40 mineral oil meeting API SG standards. This viscosity ensures proper lubrication of the camshaft, lifters, and main bearings, especially under load. Change intervals should not exceed 15,000 km or annually, whichever comes first, to prevent sludge and wear.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.