The Lancia F 105 L.046 – Petrol is a 1,584 cc, inline‑four naturally aspirated engine produced between 1967 and 1974. It features a single overhead camshaft (SOHC) design with two valves per cylinder, delivering a balance of performance and reliability for its era. The engine’s robust cast-iron block and aluminum cylinder head were engineered for durability under varied driving conditions.
Fitted primarily to the Lancia Fulvia Coupé and Berlina models, the F 105 L.046 was designed for spirited driving and touring comfort. It offered responsive throttle characteristics and a linear power delivery, making it well-suited for both city and highway use. Emissions controls were minimal for the period, as the engine predates stringent Euro standards.
One documented engineering refinement was the transition from a single to a double-barrel Weber carburetor in later model years, as noted in Lancia Service Bulletin L‑68‑04. This update aimed to improve mid-range torque and overall drivability. The change coincided with minor cylinder head revisions to optimize airflow and combustion efficiency.
This engine predates standardized EU emissions regulations. Production years 1967–1974 fall outside the scope of Euro 1–6 standards (EU Regulation (EC) No 715/2007).
The Lancia F 105 L.046 – Petrol is a 1,584 cc inline‑four naturally aspirated engine engineered for compact executive models (1967-1974). It combines a single overhead camshaft with a twin-choke carburetor to deliver smooth, linear power delivery. Designed before modern emissions standards, it prioritizes mechanical simplicity and driving engagement over environmental compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,584 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.0 mm × 75.0 mm | |
| Power output | 80–98 PS (59–72 kW) | |
| Torque | 12.5–13.5 kgm @ 3,500 rpm | |
| Fuel system | Weber 32/36 DGEV or 36 DCNF carburetor | |
| Emissions standard | Pre-regulation (No Euro standard) | |
| Compression ratio | 9.0:1 – 9.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC | |
| Oil type | SAE 20W-50 (Mineral) | |
| Dry weight | 145 kg |
The SOHC design offers mechanical simplicity and ease of maintenance but requires periodic valve clearance adjustment every 10,000 km. The carburetor demands precise tuning and is sensitive to fuel quality; use of leaded or high-octane unleaded petrol is recommended to prevent valve seat recession. The timing chain is generally robust but should be inspected for slack at 60,000 km. Cooling system maintenance is critical due to the engine’s narrow operating temperature range.
Oil Specs: Requires SAE 20W-50 mineral oil for optimal valve train protection (Lancia Owner's Manual, 1970).
Emissions: Pre-dates Euro standards. No formal emissions certification exists (EU Regulation (EC) No 715/2007).
Power Ratings: Measured under DIN 70020 standards. Output varies by carburetor type and compression ratio (Lancia Factory Data Sheet, 1972).
Lancia Technical Workshop Manual (Sections 02, 03)
Lancia Parts Catalogue (Doc. PC-F105-67)
Lancia Service Bulletin (L‑68‑04)
EU Regulation (EC) No 715/2007
The Lancia F 105 L.046 – Petrol was used across Lancia's Fulvia platform with longitudinal, front-mounted installation. This engine received platform-specific adaptations-different intake manifolds for Coupé vs. Berlina-and from 1970 the Series 2 models featured a revised cylinder head and carburetor, creating minor parts interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine type code stamped on the flat boss adjacent to the distributor on the cylinder head. The full designation "F 105 L.046" should be visible. Series 1 engines (pre-1970) typically have a single-barrel or early twin-barrel carburetor and a smooth cam cover. Series 2 engines (post-1970) feature a ribbed cam cover and the later Weber 36 DCNF carburetor. Critical differentiation: Series 2 heads have larger inlet ports and revised combustion chambers.
The F 105 L.046 – Petrol's primary reliability risk is cooling system failure, with elevated incidence in hot climates or under sustained high load. Lancia workshop data from the 1970s indicated cooling-related head gasket failures were a common cause of workshop visits, while valve seat recession is prevalent in engines run on modern low-octane unleaded fuel without modification. Infrequent oil changes and neglecting valve clearances accelerate wear, making adherence to the original maintenance schedule critical.
Analysis derived from Lancia technical bulletins (1967-1974) and historical workshop manuals. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA F-105-L-046.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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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.
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