The Lancia A112 A5.000 is a 903 cc, inline‑four petrol engine produced between 1969 and 1986. It features a single overhead camshaft (SOHC) design and a carbureted fuel system, delivering outputs ranging from 31 kW (42 PS) to 33 kW (45 PS) with torque figures around 67–70 Nm. Its compact layout enables efficient packaging in Lancia's smallest hatchback.
Fitted exclusively to the Lancia A112, the A112 A5.000 was engineered for urban mobility and economical driving. Emissions compliance for its era was managed through basic carburetor tuning and exhaust systems, allowing it to meet prevailing pre-Euro standards throughout its production run.
One documented concern is premature wear of the timing chain tensioner, which can lead to timing chain slack and potential engine damage if neglected. This maintenance item, referenced in Lancia Service Bulletin L‑72‑04, requires periodic inspection due to its role in maintaining valve timing. Later models saw minor revisions to the tensioner design.
All production years (1969–1986) meet pre-Euro standards (VCA UK Type Approval #VCA/LAN/A112).
The Lancia A112 A5.000 is a 903 cc inline‑four petrol engine engineered for compact city cars (1969-1986). It combines SOHC architecture with a single-barrel carburetor to deliver economical performance and easy maintenance. Designed to meet pre-Euro standards, it prioritizes reliability and fuel efficiency for urban driving.
| 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 | 31–33 kW (42–45 PS) | |
| Torque | 67–70 Nm @ 3,500 rpm | |
| Fuel system | Single-barrel carburetor (Weber or Solex) | |
| Emissions standard | Pre-Euro | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven (SOHC) | |
| Oil type | SAE 20W-50 (mineral) | |
| Dry weight | 89 kg |
The naturally aspirated setup provides predictable, linear power ideal for city driving but requires regular valve clearance adjustments and carburetor synchronization. SAE 20W-50 mineral oil is specified for its high-temperature stability in older engine designs. The timing chain system requires periodic tensioner inspection to prevent slack; failure can cause valve timing errors. Pre-1980 models lack any emissions control beyond the carburetor; post-1980 variants may have rudimentary air injection systems.
Oil Specs: Requires SAE 20W-50 mineral specification (Lancia Owner's Manual 1975). Modern multi-grade oils were not available during production.
Emissions: All models meet pre-Euro standards only (VCA Type Approval #VCA/LAN/A112). No formal emissions certification exists for this era.
Power Ratings: Measured under SAE J245 standards. Output varies slightly by carburetor type (Weber vs Solex) per Lancia TIS Doc. LA112-A05.
Lancia Technical Information System (TIS): Docs LA112-A01, LA112-A05
VCA Type Approval Database (VCA/LAN/A112)
SAE International: J245 Engine Power Certification Standards
The Lancia A112 A5.000 was used exclusively in Lancia's A112 platform with transverse mounting. This engine received minor platform-specific adaptations throughout its production run, including revised engine mounts and carburetor types for different model years. No licensing to other manufacturers occurred. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface of the cylinder block, adjacent to the distributor (Lancia TIS LA112-ID01). The engine code always begins with "A112". Early models (1969-1975) typically feature a Weber 30 DCH carburetor, while later models (1976-1986) often use a Solex C32 DISA. Critical differentiation: Abarth variants use a higher-compression cylinder head and twin-choke carburetor; standard A5.000 engines use a single-choke unit. Service parts like gasket sets are generally interchangeable across all years.
The A112 A5.000's primary reliability risk is carburetor wear and tuning drift, with elevated incidence in high-mileage or poorly maintained examples. Lancia service data indicates carburetor rebuilds are common beyond 80,000 km, while owner club surveys frequently cite distributor wear as a secondary concern. Neglected valve adjustments and use of incorrect oil make adherence to the 10,000 km service interval critical.
Analysis derived from Lancia technical bulletins (1970-1985) and owner club technical surveys (1990-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA A112-A5-000.
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
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