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 evolution of Lancia's World Rally Championship legend. Emissions compliance for its era was managed through its electronic fuel injection and catalytic converter, allowing it to meet Euro 1 standards for the European market during its production run.
One documented characteristic is the potential for turbocharger overboost conditions under aggressive driving. This issue, addressed in Lancia service bulletins, can trigger limp-home mode or damage the wastegate actuator. In 1993, Lancia revised the boost control solenoid and ECU mapping to improve reliability under sustained load.
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 intercooled turbo provides explosive mid-range power ideal for spirited driving but requires strict adherence to 10,000 km oil change intervals to prevent turbo bearing failure. Using the specified SAE 10W-40 oil is critical for maintaining turbocharger health. The Weber-Marelli IAW 4G system demands clean, high-octane fuel to prevent injector clogging. The timing belt, which also drives the water pump, must be replaced every 60,000 km to prevent catastrophic engine damage. The 1993 model year features a revised boost control solenoid per Lancia bulletin to prevent overboost.
Oil Specs: Requires SAE 10W-40, API SG/CC specification (Lancia Delta Integrale Evoluzione II Owner's Manual, Ed. 1993).
Emissions: Euro 1 certification applies to all production years (EC Directive 91/441/EEC).
Power Ratings: Measured under EEC 80/1269 standards (Lancia Group PT-1994).
Lancia Delta Integrale Evoluzione II Workshop Manual, Edition 1993
Lancia Technical Bulletin: TB-93-01
European Commission: Directive 91/441/EEC
Lancia Engineering Report: ER-92-05
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.
Locate the engine code stamped on the front face of the cylinder block, near the timing belt cover (Lancia Workshop Manual). The 8th digit of the VIN is 'H' for vehicles equipped with this specific 2.0L 16V turbo engine. Visually, it is identifiable by its top-mounted intercooler and distinctive red camshaft covers, identical to the B5.000. Critical differentiation: This engine code is exclusive to the Evoluzione II and features a unique ECU calibration. Service parts, particularly the ECU and boost control solenoid, are specific to the C5.046 variant.
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.
Find answers to most commonly asked questions about LANCIA 831-C5-046.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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