The Lancia A112 B2.000 is a 903 cc, inline‑four petrol engine produced between 1971 and 1985. It featured a single overhead camshaft (SOHC) design with two valves per cylinder and a carburettor for fuel delivery. Output varied across its lifespan but typically ranged from 48 PS to 58 PS, providing adequate performance for the lightweight A112 city car.
Fitted exclusively to the Lancia A112 across various series (Elite, Elegant, Abarth), the B2.000 was engineered for urban agility and fuel-efficient commuting. Its simple, robust design prioritized reliability and ease of maintenance over outright power. Emissions compliance for its era was managed through basic carburetion and ignition timing, predating formal Euro standards.
A documented service consideration involves the points-based ignition system, which requires periodic adjustment and replacement as per Lancia workshop manuals. Later series saw minor updates to the cylinder head and carburettor jetting to improve emissions and drivability, though no major generational overhaul occurred during its production run.
Predates formal EU emissions standards; compliance based on national regulations of production era (No VCA UK Type Approval applicable for this vintage).
The Lancia A112 B2.000 is a 903 cc inline‑four petrol engine engineered for the compact A112 hatchback (1971-1985). It combines a simple SOHC valvetrain with carburetted fuel delivery to deliver reliable, economical urban performance. Designed for its era, it operates without the complex emissions systems of modern engines.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 903 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 65.0 mm × 68.0 mm | |
| Power output | 48–58 PS (35–43 kW) | |
| Torque | 68–75 Nm | |
| Fuel system | Single downdraft carburettor (Weber or Solex) | |
| Emissions standard | Pre-Euro (National regulations) | |
| Compression ratio | 9.0:1 – 9.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC | |
| Oil type | SAE 20W-50 (Mineral, API SF/CC) |
The carburetted setup offers straightforward tuning but demands regular synchronization and jet cleaning to maintain smooth idle and fuel economy. The points ignition requires gap checks and replacement every 10,000 km to prevent misfires. Using modern 20W-50 mineral oil is critical for protecting the older bearing materials. Valve clearances must be manually adjusted periodically as per the workshop manual. The simple design makes DIY repairs feasible, but sourcing NOS or quality reproduction parts is key for authenticity and reliability.
Oil Specs: Requires SAE 20W-50 mineral oil meeting API SF/CC (or equivalent vintage spec) as per Lancia Owner's Manual.
Emissions: Predates EU emissions standards; compliance was based on Italian national regulations at time of manufacture.
Power Ratings: Measured under SAE gross or DIN 70020 standards depending on market year. Figures vary by carburettor and compression ratio.
Lancia A112 Workshop Manual (1974, 1980 Editions)
Lancia A112 Owner's Manual (Various Printings)
Stellantis Heritage Documentation (Limited Public Access)
European Commission: Historical Vehicle Regulations
The Lancia A112 B2.000 was used exclusively in the Lancia A112 platform with transverse front-engine, front-wheel-drive mounting. This engine received minor series-specific adaptations-carburettor type and compression ratio changes between Elite, Elegant, and later series-and from 1975 onwards, minor emissions-related tweaks were introduced. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat boss on the front face of the cylinder block, just below the cylinder head (Lancia Workshop Manual). The code typically starts with 'B2.000' followed by a series letter/number. Visual identification: Early models (pre-1975) often have a round-top air filter housing, while later models use a rectangular housing. The distributor is mounted at the front of the engine. Critical differentiator from later FIRE engines: The B2.000 uses a chain-driven SOHC with external rocker cover, whereas FIRE engines use a belt-driven DOHC. Service parts (gaskets, manifolds) are generally consistent across A112 series but carburettor parts vary significantly.
The A112 B2.000's primary reliability focus is on its ignition and fuel systems, with wear expected in the points/condenser and carburettor components. Lancia workshop manuals detail common service intervals, while owner experience highlights the importance of using correct vintage-spec oil. Neglecting basic maintenance makes component failure and poor running critical.
Analysis derived from Lancia technical bulletins (1971-1985) and owner club maintenance records (1980-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA A112-B2-000.
Comprehensive technical documentation and regulatory references
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LANCIA 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
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