Lancia Flat-4 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; 90.8 cu in (1,488 cc) 1.5 L; 90.9 cu in (1,490 cc) 1.5 L; 91.5 cu in (1,500 cc) 1.7 L; 105.4 cu in (1,727 cc) 1.8 L; 109.8 cu in (1,800 cc) 1.8 L; 110.8 cu in (1,816 cc) 2.0 L; 121.5 cu in (1,991 cc) 2.0 L; 122.0 cu in (1,999 cc) 2.5 L; 151.6 cu in (2,484 cc)
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, and later overhead camshaft, flat-four (boxer) engine made by Lancia, initially for the 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, and its derivatives including the Lancia 2000. In 1976, a new overhead cam engine based on a similar layout was designed and brought into production in 2 and 2.5-litre displacements for the Gamma.