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 — sp…
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 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 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.
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In its era, the P 8 C was a robust and advanced engine. For modern preservation, its long-term reliability depends entirely on meticulous, period-correct maintenance. Using the right oil, keeping it cool, and running it regularly are paramount. Neglect or incorrect servicing will lead to rapid failure.
The most common issues are valve train lubrication failure due to incorrect oil, overheating from the thermosiphon system, carburettor problems, and sludge buildup in the crankcase. These stem from its age, design complexity, and the need for specific maintenance practices.
The P 8 C engine was used exclusively in the Lancia Trikappa, produced from 1922 to 1925. It was available in Berlina (saloon), Torpedo (open tourer), and Spider (roadster) body styles. No other Lancia or external manufacturer used this engine.
Significant tuning is impractical and historically inaccurate. Minor gains could be had from optimizing the carburettor or ignition timing, but the low compression ratio and mechanical design limit potential. Preservation, not modification, is the primary goal for this historic engine.
Official figures are unavailable, but estimates for the Trikappa suggest around 15-20 L/100km (14-16 mpg UK). This is typical for a large, low-compression, luxury car of the 1920s. Fuel consumption was not a primary design concern for vehicles of this class at the time.
No. The P 8 C uses a side-valve (flathead) design. In this configuration, the valves are located in the block beside the pistons, making it physically impossible for them to collide, even if the timing system fails completely.
It requires a non-detergent SAE 30 mineral oil, as specified in the original 1922 owner's manual. Modern multi-grade or detergent oils can wash away the protective layer on the original babbit bearings, leading to rapid wear and engine failure.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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