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. Emissi…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The A112 A5.000 is mechanically simple and robust when meticulously maintained. Its primary weaknesses are the carburetor and ignition system, which require periodic rebuilding or replacement. With correct SAE 20W-50 oil and regular valve adjustments, these engines can easily surpass 150,000 km. Well-preserved examples are highly reliable for their era.
The most frequent issues are carburetor wear leading to poor running, distributor/ignition component failure causing misfires, and incorrect valve clearances resulting in noise and power loss. Cooling system leaks from aged hoses and the water pump are also common. These are well-documented in Lancia service bulletins.
This engine was fitted exclusively to the Lancia A112 hatchback across all its production years (1969-1986) and variants (Normale, Elegant, Abarth). It was not used in any other Lancia model or licensed to other manufacturers.
Yes, within limits. The Abarth variant already demonstrates this with a higher-compression head and twin-choke carburetor. For the standard A5.000, fitting an Abarth-spec cylinder head, a performance camshaft, and a twin-choke carburetor can yield safe gains. Supporting modifications like a free-flow exhaust are recommended. Significant power increases require engine swaps.
Expect 7-9 L/100km (31-40 mpg UK) in mixed city/highway driving for a standard A112. Fuel economy is heavily dependent on carburetor condition and driving style; a poorly tuned carburetor can easily increase consumption by 20-30%. Highway cruising can return 6-7 L/100km (40-47 mpg UK).
No, the A112 A5.000 is a non-interference engine. If the timing chain were to fail or jump, the pistons will not contact the open valves. This design choice enhances reliability for a basic economy engine, though valve timing will still be lost, preventing the engine from running.
Lancia specified a quality mineral SAE 20W-50 oil for this engine. While modern multi-grade oils can be used, the original specification was designed for the engine's tolerances and the high under-bonnet temperatures of its era. Change every 10,000 km or annually.
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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