Maserati 6-cylinder engine

Maserati made two naturally-aspirated, straight-6, racing engines, designed for Formula One; between 1952 and 1960. The first engine was the 2.0-liter A6G; in accordance with the engine regulations imposed by the FIA. Their second and last engine was the 250 F1; in accordance with the engine regulations imposed by the FIA for 1954. Several of these engines, or derivatives of these engines, were also used in various Maserati sports cars.^{[2][3][4][5][6]}

A6G 2.0 L I-6 250 F1 2.5 L I-6
Overview
Manufacturer	Maserati
Production	1952–1960
Layout
Configuration	L-6
Displacement	2.0–2.5 L (122.0–152.6 cu in)
Cylinder bore	72.6–84 mm (2.86–3.31 in)
Piston stroke	75–80 mm (3.0–3.1 in)
Valvetrain	24-valve, DOHC, 4-valves per cylinder
Compression ratio	12:1-13.5:1
Combustion
Fuel system	Carburetor/Fuel injection
Fuel type	Gasoline
Cooling system	Water-cooled
Output
Power output	150–290 hp (112–216 kW; 152–294 PS)
Torque output	105–211 lb⋅ft (142–286 N⋅m)[1]
Chronology
Predecessor	Maserati 4-cylinder F1 engine

Maserati A6GCM engine

The inline 6-cylinder two-liter engine with DOHC and 12 valves, 3 two-barrel (twin choke) Weber carburetors delivered 160 hp (120 kW) to 197 hp (147 kW). It was developed by Alberto Massimino and Vittorio Bellentani.

• Initially with a 1,987 cc (121.3 cu in) capacity (72.6 mm × 80 mm (2.86 in × 3.15 in), with a compression ratio of 13.5 :1) delivering 160 hp (120 kW), in 1951 and 1952
• Then 1,988 cc (121.3 cu in) capacity (75 mm × 75 mm (2.95 in × 2.95 in), with a compression ratio of 13.5 :1, with twin ignition^{[clarification needed]}) delivering 180 hp (130 kW), in late 1952
• And finally with a 1,970 cc (120 cu in) capacity 76.2 mm × 72 mm (3.00 in × 2.83 in), with a compression ratio of 12 :1, with twin ignition^{[clarification needed]}) delivering 197 hp (147 kW), in 1953.

The engine was mated to a 4-speed gearbox.^{[7][8][9][10][11][12]}

Maserati 250 F1 engine

The 250F principally used the SSG 220 bhp (@ 7400 rpm) 2.5-litre Maserati A6 straight-six engine.^{[13][14][15][16][17][18][19]}

Maserati 300S sports car engine

The 3.0-liter (approx 245 bhp (183 kW) at 6200 rpm) engine used in the Maserati 300S was based on the Straight-6 design of the Maserati 250F and incorporated a lengthened stroke developed by Vittorio Bellentani to increase the capacity from the original 2.5-litres. The compression ratio was reduced from 12:1 to 9.5:1, partly due to the FIA regulations requiring the engine to be run on road car fuel. It used three Weber carburetors.^{[20][21][22][23][24][25][26]}

Applications

Formula 1 cars

• Maserati A6GCM
• Maserati 250F

Sports cars

• Maserati 300S