The Lancia AR 37101 is a 3,710 cc, narrow-angle V8 petrol engine produced between 1931 and 1937. It featured a single overhead camshaft per cylinder bank and side-valve configuration, delivering power outputs around 88 kW (120 PS). This 19° ‘V’ layout, known as a 'Lancia V8', was designed for compactness and smoothness, allowing a lower bonnet line for improved aerodynamics.
Fitted to the Lancia Artena model, the AR 37101 was engineered for executive touring refinement and quiet, effortless cruising. Its design prioritized low-end torque and mechanical silence for comfortable long-distance travel on the era's developing road infrastructure. Emissions controls were non-existent in this period, predating formal standards by decades.
One documented engineering focus was managing the thermal dynamics of its narrow V-angle, which concentrated heat in the valley between cylinder banks. This was addressed through a sophisticated water jacket design and a large-capacity radiator, as detailed in Lancia's internal engineering reports. The engine's complexity and cost contributed to its exclusive use in the Artena.
Production years 1931–1937 predate formal emissions regulations. This engine was designed and certified for use under the vehicle standards of the Kingdom of Italy in the 1930s.
The Lancia AR 37101 is a 3,710 cc narrow-angle V8 petrol engine engineered for luxury saloons (1931-1937). It combines a single overhead camshaft per bank with a side-valve layout to deliver smooth, refined power. Designed before the era of emissions standards, it prioritizes mechanical elegance and torque for its time.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,710 cc | |
| Fuel type | Petrol | |
| Configuration | Narrow-angle V8 (19°), SOHC per bank, Side-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 80.0 mm × 92.0 mm | |
| Power output | 88 kW (120 PS) @ 3,800 rpm | |
| Torque | Not officially recorded (estimated high for era) | |
| Fuel system | Single Weber carburettor | |
| Emissions standard | None (Pre-regulation era) | |
| Compression ratio | 5.75:1 | |
| Cooling system | Water-cooled, centrifugal pump | |
| Turbocharger | None | |
| Timing system | Gear-driven SOHC per bank | |
| Oil type | SAE 40 mineral oil (non-detergent) | |
| Dry weight | Approx. 330 kg |
The narrow V8 layout provides exceptional smoothness but creates a hot spot in the valley between cylinder banks, demanding a robust cooling system. Using period-correct non-detergent SAE 40 oil is essential to preserve original babbit bearings. The centrifugal water pump is reliable but requires inspection of its leather-sealed bearings. The low 5.75:1 compression ratio allows the use of modern low-octane fuel. Regular de-sludging of the sump is critical due to the absence of a pressurised oil filter.
Oil Specs: Requires non-detergent SAE 40 mineral oil as specified in the original 1931 owner's manual. Modern detergent oils can damage original bearings.
Emissions: No emissions standards existed for this era. Certification was based on national vehicle safety and construction norms (Kingdom of Italy, 1930s).
Power Ratings: Measured under manufacturer's internal dynamometer standards of the era. Output is SAE gross horsepower equivalent.
Lancia Historical Archive, Artena Technical Specification Sheet
Lancia Engineering Report, 'Artena Engine Design' (1930)
Lancia Historical Archive, Artena Owner's Manual (1931)
European Commission, Historical Vehicle Regulations Review
The Lancia AR 37101 was used exclusively in Lancia's Artena platform with longitudinal mounting and was not licensed to other manufacturers. This engine received no platform-specific adaptations as it was bespoke to the Artena. All technical details are documented in original factory service bulletins and engineering reports.
The engine code 'AR 37101' is typically cast into the engine block or found on a brass data plate affixed to the firewall or chassis. The Artena is the only model to use this engine. Visually, it is identified by its compact V8 block with a 19° angle, single Weber carburettor, and twin camshaft covers. Differentiation from other Lancia engines is straightforward due to its unique narrow V8 configuration. Service parts are extremely rare and require verification against original Lancia parts catalogues.
The AR 37101's primary reliability risk is overheating in the valley between its narrow V cylinder banks, with elevated incidence in traffic or hot climates. Lancia service bulletins from the 1930s emphasized radiator maintenance, while modern preservation guides note that cooling system neglect is the leading cause of major failure. Infrequent operation and use of incorrect coolant make adherence to period maintenance procedures critical.
Analysis derived from Lancia technical bulletins (1931-1937) and Lancia Historical Society preservation guidelines (2000-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA AR37101.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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