The Lancia P 8 C is a 2,570 cc, inline‑eight petrol engine produced between 1922 and 1925. It featured a single overhead camshaft (SOHC) and side-valve configuration, delivering power outputs around 59 kW (80 PS). This narrow-angle ‘V’ layout within an inline block, known as a 'monobloc', was an innovative solution for its era, enhancing structural rigidity.
Fitted exclusively to the Lancia Trikappa model, the P 8 C was engineered for grand touring refinement and high-speed stability. Its design prioritized smooth power delivery for long-distance motoring on the improving European road network of the 1920s. Emissions controls were non-existent in this period, predating formal standards by decades.
One documented engineering challenge was managing the thermal expansion and lubrication of its complex monobloc crankcase. This was addressed through meticulous foundry work and the use of advanced (for the time) babbit metal bearings, as detailed in Lancia's internal engineering reports from the period. The engine's complexity contributed to its limited production run before being succeeded by simpler designs.
Production years 1922–1925 predate formal emissions regulations. This engine was designed and certified for use under the vehicle standards of the Kingdom of Italy in the 1920s.
The Lancia P 8 C is a 2,570 cc inline‑eight petrol engine engineered for luxury grand tourers (1922-1925). It combines a monobloc crankcase with a single overhead camshaft to deliver smooth, high-speed performance. Designed before the era of emissions standards, it prioritizes mechanical refinement and power for its time.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,570 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-8, SOHC, Side-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 65.0 mm × 97.0 mm | |
| Power output | 59 kW (80 PS) @ 2,300 rpm | |
| Torque | Not officially recorded (estimated high for era) | |
| Fuel system | Single Zenith carburettor | |
| Emissions standard | None (Pre-regulation era) | |
| Compression ratio | 4.75:1 | |
| Cooling system | Water-cooled, thermosiphon | |
| Turbocharger | None | |
| Timing system | Gear-driven SOHC | |
| Oil type | SAE 30 mineral oil (non-detergent) | |
| Dry weight | Approx. 280 kg |
The inline-eight layout provides exceptional smoothness but demands meticulous maintenance of its complex valve train and lubrication system. Using period-correct non-detergent SAE 30 oil is critical to avoid damaging original babbit bearings. The thermosiphon cooling system requires vigilant monitoring to prevent overheating, especially under load. The low 4.75:1 compression ratio allows the use of modern low-octane fuel without modification. Regular de-sludging of the sump is essential due to the lack of a modern oil filter.
Oil Specs: Requires non-detergent SAE 30 mineral oil as specified in the original 1922 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, 1920s).
Power Ratings: Measured under manufacturer's internal dynamometer standards of the era. Output is SAE gross horsepower equivalent.
Lancia Historical Archive, Trikappa Technical Specification Sheet
Lancia Engineering Report, 'Trikappa Engine Design' (1921)
Lancia Historical Archive, Trikappa Owner's Manual (1922)
European Commission, Historical Vehicle Regulations Review
The Lancia P 8 C was used exclusively in Lancia's Trikappa platform with longitudinal mounting and was not licensed to other manufacturers. This engine received no platform-specific adaptations as it was bespoke to the Trikappa. All technical details are documented in original factory service bulletins and engineering reports.
The engine code 'P 8 C' is typically cast into the engine block or found on a brass data plate affixed to the firewall or chassis. The Trikappa is the only model to use this engine. Visually, it is identified by its long, inline-eight cylinder block, single Zenith carburettor, and distinctive Lancia 'fluted' rocker cover. Differentiation from other Lancia engines is straightforward due to its unique cylinder count and configuration for the marque. Service parts are extremely rare and require verification against original Lancia parts catalogues.
The P 8 C's primary reliability risk is lubrication failure in its complex valve train and main bearings, with elevated incidence in poorly maintained or infrequently used examples. Lancia service bulletins from the 1920s emphasized the critical nature of oil levels and quality, while modern preservation societies note that seized engines are almost always the result of incorrect oil or lack of use. Infrequent operation and use of modern detergent oils make adherence to period maintenance procedures critical.
Analysis derived from Lancia technical bulletins (1922-1925) and Lancia Historical Society preservation guidelines (2000-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA P8C.
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Regulation (EC) No 715/2007
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