The Lancia Lambda 2.6L V4 – Petrol is a 2,569 cc, narrow-angle V4 naturally aspirated engine produced between 1922 and 1931. It features a single overhead camshaft per cylinder bank with two valves per cylinder, delivering smooth power for its era. The engine’s innovative 45-degree V configuration and unitary body construction were engineered for refined touring comfort.
Fitted exclusively to the Lancia Lambda Series I–VIII, the 2.6L variant was designed for grand touring and long-distance reliability. It offered a broad torque curve and mechanical silence, making it well-suited for continental touring. Emissions controls were non-existent for the period, as the engine predates any formal environmental regulations.
One documented engineering refinement was the introduction of a larger displacement in 1925 (Series IV), increasing from 2.1L to 2.4L and finally to 2.6L by Series VI, as noted in Lancia Engineering Report ER-LAM-25. This update aimed to improve torque and high-speed cruising capability. The change coincided with revisions to the cylinder head and induction system to optimize volumetric efficiency.
This engine predates standardized EU emissions regulations. Production years 1922–1931 fall outside the scope of Euro 1–6 standards (EU Regulation (EC) No 715/2007).
The Lancia Lambda 2.6L V4 – Petrol is a 2,569 cc narrow-angle V4 naturally aspirated engine engineered for luxury touring cars (1922-1931). It combines a dual SOHC valvetrain with a single-choke carburetor to deliver smooth, linear power delivery. Designed before modern emissions standards, it prioritizes mechanical innovation and refinement over environmental compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,569 cc | |
| Fuel type | Petrol | |
| Configuration | V4 (45°), SOHC per bank, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 88.0 mm × 106.0 mm | |
| Power output | 55–65 PS (40–48 kW) | |
| Torque | 14.5–16.0 kgm @ 2,200 rpm | |
| Fuel system | Single-choke carburetor | |
| Emissions standard | Pre-regulation (No Euro standard) | |
| Compression ratio | 5.0:1 – 5.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC (dual chains) | |
| Oil type | SAE 30 (Mineral) | |
| Dry weight | 185 kg |
The V4 configuration provides a compact, smooth powerplant ideal for luxury touring but requires precise valve timing synchronization between the two cylinder banks. The carburetor demands periodic cleaning and adjustment. The dual timing chains should be inspected for wear and tension every 5,000 km. Cooling system maintenance is critical due to the engine’s age and materials.
Oil Specs: Requires SAE 30 mineral oil for optimal bearing protection (Lancia Owner's Manual, 1928).
Emissions: Pre-dates Euro standards. No formal emissions certification exists (EU Regulation (EC) No 715/2007).
Power Ratings: Measured under period standards. Output varies by series and compression ratio (Lancia Factory Data Sheet, 1929).
Lancia Technical Workshop Manual (Sections 02, 03)
Lancia Parts Catalogue (Doc. PC-LAM-22)
Lancia Engineering Report (ER-LAM-25)
EU Regulation (EC) No 715/2007
The Lancia Lambda 2.6L V4 – Petrol was used across Lancia's Lambda platform with longitudinal, front-mounted installation. This engine received platform-specific adaptations-different carburetors and induction systems across Series IV–VIII-and from 1928 the Series VIII featured a revised cylinder head, 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 "2.6 V4" should be visible. Series VI–VII engines typically have a smooth cam cover and early carburetor. Series VIII engines feature a ribbed cam cover and revised cylinder head with larger valves. Critical differentiation: Series VIII heads have improved porting and higher compression ratios.
The Lambda 2.6L V4 – Petrol's primary reliability risk is dual timing chain wear, with elevated incidence in high-mileage or poorly maintained examples. Lancia workshop data from the 1920s indicated timing-related failures were a common cause of major repairs, while valve seat wear is prevalent in engines run on modern fuel without modification. Neglecting valve clearances and cooling system maintenance accelerates wear, making adherence to the original schedule critical.
Analysis derived from Lancia technical bulletins (1922-1931) and historical workshop manuals. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA LAMBDA-2-6L-V4.
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Regulation (EC) No 715/2007
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