4CLT 1.5 L I-4 250S 2.5 L I-4 Tipo 6-1500 1.5 L I-4 4CF2 1.5 L I-4 42CF 2.0 L I-4
Overview
Manufacturer	Maserati
Production	1950–1951, 1959–1963
Layout
Configuration	L-4
Displacement	1.5–2.5 L (91.5–152.6 cu in)
Cylinder bore	78 mm (3.1 in)
Piston stroke	78 mm (3.1 in)
Valvetrain	16-valve, DOHC, 4-valves per cylinder
Compression ratio	6:1-6.5:1
Combustion
Fuel system	Carburetor/Electronic fuel injection
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	150–280 hp (112–209 kW; 152–284 PS)
Torque output	approx. 105–210 lb⋅ft (142–285 N⋅m)
Dimensions
Dry weight	165 kg (364 lb)[1]
Chronology
Successor	Maserati 6-cylinder F1 engine

Maserati has made three inline-4 racing engines, that were designed for both Formula One and Sports car racing. Their first engine was the supercharged 4CLT engine in 1950; with the 1.5 L engine configuration imposed by the FIA for engines with forced induction.^[2][3][4] Their second engine was the naturally-aspirated 250S engine; with the 2.5 L engine configuration, and was used by Cooper and JBW. Their third and final engine was the naturally-aspirated Tipo 6-1500; with the 1.5 L engine configuration, and the customer engine was used by Cooper, Emeryson, Lotus, and E.N.B. teams.^[5]

A 1.5 L (92 cu in) version of the engine was used in the Maserati 150S, (as well as the Maserati 150 GT concept car^[6][7][8])^{[9][10][11][12]} and a 2.0 L (120 cu in) version of this engine was also used in the 1955-1959 Maserati 200S sports car.^{[13][14][15][16][17][18]}