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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)
Chronology
Predecessor	Maserati 4-cylinder F1 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.

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) 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) delivering 197 hp (147 kW), in 1953.

The engine was mated to a 4-speed gearbox.

Maserati 250 F1 engine

The 250F principally used the SSG 220 bhp (@ 7400 rpm) 2.5-litre Maserati A6 straight-six engine.

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.

Applications

Formula 1 cars

• Maserati A6GCM
• Maserati 250F

Sports cars

• Maserati 300S

References

1. "Specifications of 50 famous racing engines up to 1994 - Page 8 - F1technical.net". www.f1technical.net.
2. "Engine Maserati • STATS F1". www.statsf1.com.
3. "Maserati 250F - F1technical.net". www.f1technical.net.
4. "Maserati 250F". May 19, 2010.
5. "1957 Maserati 250 F | Maserati". April 17, 2016.
6. "1954 - 1956 Maserati 250F - Images, Specifications and Information". Ultimatecarpage.com.
7. "1954 Maserati A6GCS By Fiandri & Malagoli @ Top Speed". Top Speed. December 23, 2019.
8. "1947 - 1952 Maserati A6GCS - Images, Specifications and Information". Ultimatecarpage.com.
9. "1952 Maserati A6GCM Specifications". Ultimatecarpage.com.
10. "1952 Maserati A6GCM full range specs". www.automobile-catalog.com.
11. "1951 Maserati A6GCM | Maserati". April 18, 2016.
12. "The Maserati A6 Part II". www.maserati-alfieri.co.uk.
13. "1954 Maserati Tipo 250F". historicautopro.
14. "The birth of an icon - Car profile: Maserati 250F". ESPN UK.
15. "1954 Maserati 250 F Formula 1 full range specs". www.automobile-catalog.com.
16. "1957: Maserati 250F". antonio_eiras.
17. "Bonhams : Maserati 250F Monoposto Child Car". www.bonhams.com.
18. "1954 Maserati 250F Wallpapers". WSupercars. August 22, 2014.
19. "Motor1.com Legends: Maserati 250F". Motor1.com.
20. "1955 - 1958 Maserati 300S - Images, Specifications and Information". Ultimatecarpage.com.
21. Murphy, William (July 12, 2008). "1956 Maserati 300S". Simeone Foundation Automotive Museum.
22. "1957 Maserati 300s". Redline.
23. "1955 Maserati 300S | Maserati". April 18, 2016.
24. "1957 Maserati 300 S Grand Prix full range specs". www.automobile-catalog.com.
25. "Full performance review of 1957 Maserati 300 S (man. 4) model for Europe North America racing/rallye". www.automobile-catalog.com.
26. "1956 - 1958 Maserati 300s @ Top Speed". Top Speed. March 6, 2006.

• Maserati
• Formula One engines
• Gasoline engines by model
• Straight-four engines