The Lancia A112 B1.000 is a 903 cc, inline‑four petrol engine produced between 1969 and 1986. It features a single overhead camshaft (SOHC) and a carburetor fuel system, delivering compact efficiency for its era. The engine's simple architecture prioritizes reliability and ease of maintenance for urban driving conditions.
Fitted exclusively to the Lancia A112 model across multiple series, the B1.000 was engineered for nimble city mobility and light touring. Emissions compliance for its production period was managed through basic carburetor tuning and ignition timing, predating formal Euro standards. Its lightweight design and modest power output made it ideal for navigating narrow European streets.
One documented engineering characteristic is the engine's susceptibility to carburetor wear and ignition timing drift over extended use. This can lead to rough idling and starting difficulties. Lancia service documentation recommends periodic carburetor overhaul and distributor maintenance to preserve drivability. No major generational revisions were introduced during its long production run.
Production years 1969–1986 predate standardized Euro emissions regulations. Compliance was governed by national standards of the time (e.g., Italian Ministry of Transport directives).
The Lancia A112 B1.000 is a 903 cc inline‑four petrol engine engineered for compact city cars (1969-1986). It combines a simple SOHC valvetrain with a single-barrel carburetor to deliver reliable, economical performance. Designed for urban mobility, it prioritizes ease of maintenance over high output, with no formal emissions standards compliance required during its production.
| 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 | 33 kW (45 PS) @ 5,600 rpm | |
| Torque | 68 Nm @ 3,200 rpm | |
| Fuel system | Single-barrel carburetor | |
| Emissions standard | Pre-Euro (National Standards) | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 20W-50 (Mineral) | |
| Dry weight | Not available in OEM documentation |
The simple SOHC design offers dependable performance but requires regular carburetor cleaning and adjustment to maintain smooth operation. Ignition points and distributor cap should be inspected and replaced periodically to prevent misfires. The engine is non-interference, so timing chain failure is less catastrophic. Use of high-quality mineral oil (SAE 20W-50) is recommended to protect older bearing surfaces. Avoid prolonged high-RPM operation to preserve longevity.
Oil Specs: Requires SAE 20W-50 mineral specification (Lancia Owner's Manual 1975). Modern equivalents meeting API SF/CC or higher are acceptable.
Emissions: Pre-Euro certification governed by Italian Ministry of Transport Type Approval A112/B1. No standardized EU emissions applied during production.
Power Ratings: Measured under CEE/ECE standards. Output is consistent across all A112 models (Lancia Group PT-1975).
Lancia A112 Workshop Manual (Edition 1975)
Lancia Technical Bulletins: TB-A112-01
Lancia Group Powertrain Specifications (PT-1975)
Italian Ministry of Transport Type Approval Database (A112/B1)
The Lancia A112 B1.000 was used exclusively in the Lancia A112 platform with transverse mounting and was not licensed to other manufacturers. This engine powered all series of the A112 from its launch until the introduction of larger displacement variants. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface on the engine block, typically near the oil filter or distributor (Lancia Workshop Manual). The vehicle's VIN will correspond to the A112 model. The most definitive visual cue is the single-barrel carburetor and simple distributor ignition system. Service parts are specific to the A112 B1.000 and not interchangeable with later A112 engines.
The A112 B1.000's primary reliability risk is carburetor degradation and ignition system wear, leading to drivability issues. Lancia service bulletins emphasize regular maintenance of these systems. The engine's age and simple design make adherence to basic servicing schedules critical for continued operation.
Analysis derived from Lancia technical bulletins (1969-1986) and workshop manuals. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA A112-B1-000.
Comprehensive technical documentation and regulatory references
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LANCIA Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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