The Lancia 831 C5.046 – Petrol is a 1,995 cc, inline‑four turbocharged petrol engine produced between 1993 and 1994. It features a dual overhead camshaft (DOHC) design with 16 valves and electronic fuel injection, delivering 137 kW (186 PS) and 270 Nm of torque. Its turbocharger with intercooler enables strong, sustained power delivery for high — performance driving.
Fitted exclusively to the Delta Integrale Evoluzione II, the 831 C5.046 was engineered as the final evol…
Production years 1993–1994 meet Euro 1 emissions standards (EC Directive 91/441/EEC).
The Lancia 831 C5.046 – Petrol is a 1,995 cc inline-four turbocharged petrol engine engineered for the final evolution of Lancia's rally-bred hatchback (1993-1994). It combines DOHC 16-valve architecture with electronic fuel injection and an intercooled turbocharger to deliver focused, high-revving performance. Designed to meet Euro 1 emissions standards, it represents the pinnacle of Lancia's homologation engineering.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged with intercooler | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 137 kW (186 PS) @ 5,750 rpm | |
Torque | 270 Nm @ 3,500 rpm | |
Fuel system | Weber-Marelli IAW 4G electronic fuel injection | |
Emissions standard | Euro 1 | |
Compression ratio | 8.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Garrett T3 with integral wastegate | |
Timing system | Belt-driven (requires periodic replacement) | |
Oil type | SAE 10W-40 (API SG/CC) | |
Dry weight | 152 kg |
The Lancia 831 C5.046 – Petrol was used exclusively in the Lancia Delta Integrale Evoluzione II platform with transverse front-wheel-drive mounting. This engine, the final evolution of Lancia's rally program, received specific adaptations for the Evoluzione II, including a slightly detuned power output for improved reliability and drivability. All adaptations are documented in OEM technical bulletins.
The 831 C5.046 – Petrol's primary reliability risk is turbocharger overboost or wastegate failure due to aggressive driving or ECU faults. Lancia service documentation highlights this as a common trigger for limp-home mode. UK MOT statistics from the 1990s frequently cited emissions faults on high-performance examples. Adherence to the manufacturer's oil change and timing belt schedule is critical for longevity.
Analysis derived from Lancia technical bulletins (1993-1994) and European Commission type-approval records. 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 strict oil changes every 10,000 km and timing belt changes every 60,000 km, it can be very reliable. Its rally-bred design is robust, but neglect, especially of the turbocharger and boost control system, leads to premature failure. Regular servicing and gentle cooldowns after hard driving are key to longevity.
The most critical issue is turbocharger overboost or wastegate failure. Other common problems include timing belt failure, faults in the Weber-Marelli fuel injection system, and oil leaks from the camshaft covers. All are well-documented in Lancia service literature.
This engine was used exclusively in the Lancia Delta Integrale Evoluzione II model from 1993 to 1994. It was the final evolution of the legendary rally car and was not fitted to any other Lancia models.
Yes, it is highly tunable. Simple ECU chip tuning or boost controller adjustments can easily restore it to its 200 PS predecessor's output or beyond. The robust bottom end and 16-valve head can handle increased power, making it a favorite for enthusiasts. Major modifications like larger turbos and intercoolers are common in the tuning scene.
Fuel economy is typical for a high-performance turbo engine of its era. Expect around 14-16 L/100km (20-18 mpg UK) in city driving and 9-10 L/100km (26-24 mpg UK) on the highway. Real-world combined figures typically fall between 11-13 L/100km (21-18 mpg UK).
Yes. It is an interference engine design. If the timing belt fails, the pistons will collide with the open valves, causing severe internal damage that requires a complete engine rebuild or replacement.
Lancia specified SAE 10W-40 engine oil meeting API SG/CC standards. Using a high-quality mineral or semi-synthetic oil of this grade is essential for protecting the turbocharger bearings and engine internals, especially given its performance nature.
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
Type-approval guidance and documentation.
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