# Lancia Flat-4 engine

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Reciprocating internal combustion engine

Flat-4 engine Boxer engine installed in a Lancia Flavia Overview Production 1960-1984 Layout Configuration Naturally aspirated Flat-4 Displacement 1.5 L (1,488 cc; 90.8 cu in) 1.5 L (1,490 cc; 90.9 cu in) 1.5 L (1,500 cc; 91.5 cu in) 1.7 L (1,727 cc; 105.4 cu in) 1.8 L (1,800 cc; 109.8 cu in) 1.8 L (1,816 cc; 110.8 cu in) 2.0 L (1,991 cc; 121.5 cu in) 2.0 L (1,999 cc; 122.0 cu in) 2.5 L (2,484 cc; 151.6 cu in) Cylinder bore 77 mm (3.03 in) 80 mm (3.15 in) 82 mm (3.23 in) 88 mm (3.46 in) 89 mm (3.5 in) Piston stroke 71 mm (2.8 in) 74 mm (2.91 in) 80 mm (3.15 in) 85 mm (3.35 in) Cylinder block material Light alloy Cylinder head material Aluminum Valvetrain Pushrod or Overhead camshaft Combustion Fuel system Twin-choke Weber carburetor Fuel injection Fuel type Petrol Cooling system Water-cooled Output Power output 92–140 bhp (69–104 kW; 93–142 PS) Torque output 172–208 N⋅m (127–153 lb⋅ft) Chronology Predecessor Lancia V4 engine

The **Lancia Flat-4 engine** is an aluminum, [pushrod](/source/Pushrod_engine), and later [overhead camshaft](/source/Overhead_camshaft_engine), [flat-four (boxer) engine](/source/Flat-four_engine) made by [Lancia](/source/Lancia), initially for the [Flavia](/source/Lancia_Flavia), from 1960 through 1984. Though it was designed as a pushrod engine, it was advanced for the time.[1] The pushrod version of the Lancia boxer was only ever used in the [Flavia](/source/Lancia_Flavia), and its derivatives including the [Lancia 2000](/source/Lancia_2000). In 1976, a new [overhead cam](/source/Overhead_cam) engine based on a similar layout was designed and brought into production in 2 and 2.5-litre displacements for the [Gamma](/source/Lancia_Gamma).

## Pushrod

Engine in a Lancia Flavia convertibile (by Vignale) at the 2014 Lime Rock Gathering of the Marques attached to the [Concours d'Elegance](/source/Concours_d'Elegance)

### 1500

The original version was the 1.5 L (1,500 cc; 91.5 cu in) introduced in 1960; it used an 82 mm × 71 mm (3.23 in × 2.80 in) bore and stroke. It was revised on 1963 with a smaller 80 mm (3.15 in) bore and a longer 74 mm (2.91 in) stroke, thus displacing 1.5 L (1,488 cc; 90.8 cu in). A final version was introduced in 1967 with an even longer 80 mm (3.15 in) stroke coupled with a 77 mm (3.03 in) bore, giving a displacement of 1.5 L (1,490 cc; 90.9 cu in). Production ceased in 1970.

### 1800

The first **1800** was a 1.7 L (1,727 cc; 105.4 cu in) introduced in 1962. It used an 88 mm × 71 mm (3.46 in × 2.80 in) bore and stroke. One year later it was replaced by a true 1.8 L (1,800 cc; 109.8 cu in) engine thanks to a longer 74 mm (2.91 in) stroke. In 1967 appeared the 1.8 L (1,816 cc; 110.8 cu in) version using an 85 mm × 80 mm (3.35 in × 3.15 in) bore and stroke.

### 2000

The 2.0 L (1,991 cc; 121.5 cu in) **2000** version was the ultimate Flavia engine. Bore and stroke was 89 mm × 80 mm (3.50 in × 3.15 in) for a good [oversquare](/source/Oversquare) ratio. In 1971, the 2.0 L produced 115 bhp (86 kW; 117 PS),[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*] and in the HF [Coupé](/source/Coup%C3%A9) in 1972 it produced 125 bhp (93 kW; 127 PS). This engine was produced from 1968 through 1974.

## OHC

Lancia developed the large light-alloy [overhead camshaft](/source/Overhead_camshaft) 2.0-litre and 2.5-litre flat-4 engines specifically for the [Lancia Gamma](/source/Lancia_Gamma), rather than using Fiat derived engines as used in the Beta and Montecarlo and were in production between 1976 and 1984.

A [Lancia Gamma](/source/Lancia_Gamma) flat-four engine.

### 2000

Replacing the 2.0 L pushrod engine used in the Flavia, the new 2.0 L (1,999 cc; 122.0 cu in) OHC engine produced 120 bhp (89 kW; 122 PS) at 5500 rpm[2] and 172 N⋅m (127 lb⋅ft) of torque at 3500 rpm.

### 2500

The 2.5 L (2,484 cc; 151.6 cu in) engine was initially available with twin-[choke](/source/Choke_valve) [Weber carburetors](/source/Weber_carburetor), but in the last few years of production it was equipped with [fuel injection](/source/Fuel_injection). In both forms, it produced 140 bhp (104 kW; 142 PS) at 5400 rpm and 208 N⋅m (153 lb⋅ft) torque at 3000 rpm.[3]

## References

Wikimedia Commons has media related to [Lancia Flat-4 engine](https://commons.wikimedia.org/wiki/Category:Lancia_Flat-4_engine).

1. **[^](#cite_ref-1)** Koch, Jeff (April 2008). ["Lancia Flavia 1.8 Coupe vs. Alfa GTV 1750"](http://www.hemmings.com/hsx/stories/2008/04/01/hmn_feature15.html). *Hemmings Motor News*. American City Business Journals. Retrieved 28 December 2013. Lancia's four has its cylinders [horizontally-opposed](/source/Horizontally-opposed), à la [Porsche](/source/Porsche) (or [VW Beetle](/source/VW_Beetle) if you're uncharitable)--except it's water-cooled, hanging out over the nose, and driving the front wheels. Power, even at 92 bhp (69 kW; 93 PS), was far beyond VW's modest output in those days, even allowing for the displacement discrepancy.

1. **[^](#cite_ref-2)** Daily Express Guide to World Cars 1980, page 37

1. **[^](#cite_ref-3)** [Car Catalogue International](/source/Car_Catalogue_International) 1983, page 53

v t e Lancia A marque of Stellantis Passenger cars Current models Ypsilon IV Lancia Gamma III 1980–2016 Trevi Prisma Thema I Y10 Dedra Delta II Kappa Zeta Lybra Thesis Phedra Ypsilon I Ypsilon II Musa Delta III Thema II Flavia II Voyager Ypsilon III 1945–1980 Aurelia Appia Flaminia Flavia I Fulvia 2000 Beta Stratos HF Montecarlo Gamma Delta I 1918–1945 Kappa Dikappa Trikappa Lambda Dilambda Artena Astura Augusta Aprilia Ardea 1907–1918 12 HP Alfa 18 HP Dialfa 15/20 HP Beta 20 HP Gamma 20/30 HP Delta 20/30 HP Epsilon 30/50 HP Eta 25-35 HP Theta Concept cars Florida I Florida II Fulvia Berlinetta Competizione Stratos HF Zero Dunja 1.6 HF Stratos HF Megagamma Sibilo Medusa ECV Orca HIT Magia Kayak Dialogos Fulvia Coupé Concept Pu+Ra HPE Upcoming cars Lancia Delta IV Buses Trijota Omicron Ro 140 Trucks Jota 3Ro Esatau Esadelta Esagamma E290 Vans Beta Jolly Superjolly Military vehicles 1Z 1ZM Lince Motorsport Scuderia Lancia Jolly Club Martini Racing Racing cars D24 D25 D50 LC1 LC2 Stratos HF Rally 037 Delta S4 Delta HF Ypsilon Rally4 HF Rally2 HF Integrale Drivers Andrea Aghini Markku Alén Alberto Ascari Didier Auriol Miki Biasion Louis Chiron Juha Kankkunen Sandro Munari Walter Röhrl Luigi Villoresi People Vincenzo Lancia Gianni Lancia Vittorio Jano Pier Ugo Gobbato Claudio Lombardi Sergio Limone Carlo Pesenti Francesco De Virgilio Technologies Blue&Me Flat-4 engine V4 engine V6 engine Museum Lancia Museum Museo Vincenzo Lancia Buildings Palazzo Lancia Lancia Borgo San Paolo Plant Lancia Chivasso plant Bike Lancia Urban Bike Boat Lancia di Lancia Vincenzo Lancia Category

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Adapted from the Wikipedia article [Lancia Flat-4 engine](https://en.wikipedia.org/wiki/Lancia_Flat-4_engine) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Lancia_Flat-4_engine?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.