The Lancia 138 C2.048 is a 1,991 cc, inline‑four petrol engine produced between 1972 and 1984. It features a single overhead camshaft (SOHC) design and a twin — choke carburettor, delivering outputs around 80–85 kW (109–115 PS) and 150–160 Nm of torque. Its robust cast — iron block construction provided durability for Lancia's executive sedans.
Fitted primarily to the Lancia Beta 2000 and Trevi 2000 models, the 138 C2.048 was engineered for smooth, relaxed cruising and ev…
Production years 1972–1984 predate the Euro emissions standards framework. Compliance was governed by national regulations in effect at the time of manufacture.
The Lancia 138 C2.048 is a 1,991 cc inline‑four petrol engine engineered for executive sedans (1972-1984). It combines a robust cast-iron block with a twin-choke carburettor to deliver smooth, linear power delivery. Designed for the pre-Euro regulatory era, it prioritizes mechanical simplicity and durability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,991 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 80.0 mm × 82.0 mm | |
Power output | 80–85 kW (109–115 PS) | |
Torque | 150–160 Nm @ 3,500 rpm | |
Fuel system | Twin-choke downdraft carburettor | |
Emissions standard | Pre-Euro (National Standards) | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft | |
Oil type | SAE 15W-40 mineral or semi-synthetic | |
Dry weight | 145 kg |
The Lancia 138 C2.048 was used across Lancia's Beta platform with longitudinal mounting. This engine received platform-specific adaptations-unique engine mounts for the Beta Coupé versus the Trevi-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
The 138 C2.048's primary reliability risk is cylinder head gasket failure, with elevated incidence in vehicles subjected to overheating or neglected coolant changes. Lancia service data indicates this was a common repair item, while owner club surveys consistently cite cooling system diligence as the key factor for longevity. Sustained high loads or track use make preventative gasket replacement and cooling system checks critical.
Analysis derived from Lancia technical bulletins (1975-1985) and aggregated data from Lancia owner club technical forums (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
With meticulous maintenance, particularly of the cooling system, the 138 C2.048 can be very reliable. Its main weakness is the head gasket, which fails if the engine overheats. Addressing this with the updated gasket and regular coolant changes allows these engines to achieve high mileage. Robust bottom-end construction aids longevity.
The most frequent issues are cylinder head gasket failure, carburettor problems (synchronization, clogging), cooling system leaks (hoses, water pump), and ignition system wear (distributor, HT leads). These are well-documented in Lancia service literature and owner experiences.
This 2.0L petrol engine was used in the Lancia Beta range, including the Berlina (sedan), Coupé, and HPE (hatchback) from 1972 to 1984. It was also fitted to the Lancia Trevi 2000 sedan from 1980 to 1984.
Yes, moderately. Common upgrades include a performance exhaust, high-flow air filter, and carburettor re-jetting or replacement with a higher-flow unit. Significant power gains are limited by the SOHC 8-valve design. Any tuning should ensure the cooling system is up to the task to avoid head gasket issues.
Fuel economy is typical for its era. Expect around 10.5–12.0 L/100km (23–27 mpg UK) in combined driving for a Beta or Trevi. Highway cruising can yield ~8.5 L/100km (33 mpg UK), while city driving may be 13.0 L/100km (22 mpg UK) or higher, heavily influenced by carburettor condition and driving style.
No. The Lancia 138 C2.048 is generally considered a non-interference (or 'free-wheeling') engine. If the timing chain were to fail, the pistons and valves would not collide, preventing catastrophic internal damage, though the engine would stop running.
Lancia originally specified SAE 15W-40 or 20W-50 mineral oil. A good quality semi-synthetic 15W-40 meeting API SF/CC (or equivalent) specifications is suitable for modern use. Change intervals should be every 10,000 km or annually, whichever comes first.
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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