The Lancia Flavia 1.8L Flat-4 is a 1,800 cc, horizontally opposed four-cylinder petrol engine produced between 1963 and 1970. It features a single overhead camshaft (SOHC) design with two valves per cylinder and twin downdraft carburetors, delivering smooth, balanced power with a low center of gravity. The engine’s flat-four (boxer) layout contributes to its inherent balance and minimal vibration, a hallmark of Lancia’s innovative engineering.
Fitted exclusively to the Lancia Flavia sedan and coupe, this engine was engineered for refined, comfortable touring with responsive handling. Emissions compliance for its production period was not formally regulated, but its simple carbureted design produced emissions typical of early 1960s automotive standards. The engine’s compact height and low weight distribution were key to the Flavia’s renowned roadholding.
One documented engineering focus was the durability of the timing chain and water pump, critical for long-term reliability in varied climates. Early service bulletins (Lancia Internal Memo 64/02) recommended specific coolant mixtures and tensioner inspections to mitigate wear on the chain-driven SOHC system and prevent premature water pump seal failure.
Production years 1963–1970 predate formal European emissions regulations for passenger cars. Emissions output is consistent with unregulated petrol engines of the early 1960s.
The Lancia Flavia 1.8L Flat-4 is a 1,800 cc horizontally opposed four-cylinder petrol engine engineered for executive sedans and coupes (1963-1970). It combines a SOHC 8-valve cylinder head with twin carburetors to deliver smooth, linear power. Designed before formal emissions standards, it prioritizes mechanical refinement and a low center of gravity over high output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,800 cc | |
| Fuel type | Petrol | |
| Configuration | Flat-4 (Boxer), SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 80.0 mm × 89.5 mm | |
| Power output | 85 kW (115 PS) @ 5,200 rpm | |
| Torque | 152 Nm @ 3,500 rpm | |
| Fuel system | Twin downdraft carburetors (Solex 40 PII) | |
| Emissions standard | None (pre-regulation era) | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC | |
| Oil type | SAE 20W-50 (min. API SA) | |
| Dry weight | 140 kg |
The flat-four’s smooth power delivery is ideal for relaxed touring but requires strict 5,000 km service intervals to maintain the timing chain and valve train. Premium-grade petrol (RON 95) is recommended for the higher compression ratio. The twin carburetor system demands precise synchronization and periodic cleaning for optimal running. Early service bulletins (Lancia Memo 64/02) emphasize using the correct coolant mixture to prevent corrosion and water pump seal failure.
Oil Specs: Requires SAE 20W-50 meeting API SA or equivalent (Lancia Owner's Manual). Modern mineral oils meeting API SL are suitable for classic use.
Emissions: No formal emissions standards existed for passenger cars in Europe during this production period (1963-1970).
Power Ratings: Measured under Italian homologation standards of the 1960s. Output is for the standard Flavia 1800 configuration.
Lancia Engineering Specification Sheets (F4/63)
Lancia Flavia Workshop Manual & Owner's Manual (1965)
Lancia Internal Service Memos (64/02)
Italian Ministry of Transport Type Approval Archives
The Lancia Flavia 1.8L Flat-4 was used exclusively in the Lancia Flavia platform with longitudinal mounting. This unique flat-four engine, a signature of the Flavia, received specific adaptations for different body styles (Berlina, Coupe, Convertible), primarily involving exhaust routing and engine mounts. All adaptations are documented in OEM technical bulletins.
The engine is identified by its unique flat-four (boxer) layout and displacement. The most definitive visual identifier is the low, wide profile with twin carburetors mounted centrally on top. The engine is visually distinct from other Lancia engines due to its horizontally opposed cylinders. The presence of a single camshaft cover running the length of the engine block confirms the SOHC design.
The Flavia Flat-4's primary maintenance focus is its timing chain and cooling system. Lancia service data indicates that neglecting chain tension or using incorrect coolant can lead to premature water pump or camshaft wear. Adherence to the factory maintenance schedule is critical for long-term reliability of this historically significant engine.
Analysis derived from Lancia workshop manuals (1963-1970) and Italian type approval documentation. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about LANCIA FLAVIA-1-8L-FLAT-4.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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