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 tou…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
With meticulous maintenance, the 2.6L V4 can be very reliable. Its unique V4 design is robust but requires attention to the dual timing chains and valve clearances. Key to longevity is preventing overheating, using the correct oil, and addressing valve seat wear if using modern fuel. Regular maintenance is essential for trouble-free operation.
The most frequent issues are dual timing chain wear, cooling system failures leading to overheating, carburetor malfunctions causing poor running, and valve seat wear from modern fuel. These are well-documented in Lancia's original service literature and owner club resources.
This engine was fitted to the Lancia Lambda range, specifically the Series VI (1926-1927), Series VII (1927-1928), and Series VIII (1928-1931) models. It powered the 2.6-litre variants across the Lambda lineup.
Yes, it has good tuning potential. Common upgrades include larger carburetors, performance exhausts, high-compression pistons, and aggressive camshafts. The block is strong, but internal modifications should be balanced. Many period competition parts from Lancia Corse or aftermarket tuners are still available.
Expect 14–18 L/100km (16–20 mpg UK) in mixed driving for a standard 2.6-litre Lambda. Economy is heavily influenced by driving style, carburetor condition, and state of tune. A well-maintained car driven gently might achieve closer to 12 L/100km (24 mpg UK) on highways.
Yes. The Lambda V4 is an interference engine. If either timing chain fails or jumps, the pistons can contact the valves, causing catastrophic engine damage. This makes regular inspection and timely replacement of the timing chains critically important.
Lancia originally specified SAE 30 mineral oil. For modern use, a high-quality SAE 30 mineral oil is suitable. Avoid modern multi-grade synthetics as they may not provide adequate protection for the older bearing clearances and valve train.
Comprehensive technical documentation and regulatory references
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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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