Maserati 4CM

The Maserati 4CM is an open-wheel Grand Prix motor racing car, designed, developed and built by Italian manufacturer Maserati, in 1931.[2][3]

Maserati 4CM[1]
1933 Maserati 4CM
Designer(s)Maserati
Production1932-1938
PredecessorMaserati Tipo 26
SuccessorMaserati 6CM
Technical specifications
ChassisSteel box-section frame, aluminum body
Suspension (front)Rigid axle, semi-elliptic leaf springs, friction shock absorbers
Suspension (rear)Live axle, semi-elliptic leaf springs, friction shock absorbers
Length3,680–4,000 mm (145–157 in)
Width1,480–1,500 mm (58–59 in)
Height1,200–1,350 mm (47–53 in)
Axle track1,200 mm (47 in) (front and rear)
Wheelbase2,400 mm (94 in)
Engine1.1–2.5 L (67–153 cu in) I4 FR layout
Transmission4 speed manual transmission
Weight580 kg (1,280 lb)
Competition history

In 1930, Maserati decided to concentrate its efforts on the voiturette class, which was not contested by German manufacturers such as Mercedes-Benz and Auto Union. The 1,100 cc (1.1 L; 67 cu in) Tipo 4CM was Maserati's first racing voiturette.[4] The name of the car is derived as follows:

4: 4-cylinder engine

C: Corsa, for racing

M: Monoposto, for single seater

1937 Maserati 4CM

Built alongside the 4CS two-seater sports-racer, the 4CM was powered by a 1,088.4 cc (1.0884 L; 66.42 cu in), (65 x 82 mm) twin-overhead-camshaft supercharged four-cylinder engine that produced 125 hp (92 kW) at 6,600rpm, an output sufficient to propel it to a top speed of 210 km/h (130 mph). Some cars came with a spare cylinder block, pistons, connecting rods and supercharger enabling it to be converted to 1,495.7 cc (1.4957 L; 91.27 cu in), (69 x 100 mm) when required. Depending on the size of the engine, the roots-type supercharger boosted power to 90–150 hp (66–110 kW).[5][6]

It succeeded the Maserati Tipo 26M, and was itself slowly replaced by the Maserati 6CM around 1936.[7][8]

Technical Information
4CM-1100 4CS-1500 4CM-2000 4CM-2500
engine straight-four engine
displacement 1.1 L (1,088 cc) 1.5 L (1,496 cc) 2.0 L (1,970 cc) 2.5 L (2,483 cc)
bore × stroke 65 mm × 82 mm 69 mm × 100 mm 80 mm × 98 mm 84 mm × 112 mm
compression ratio 5.6 : 1 6.0 : 1 5.8 : 1 5.8 : 1
Power at 1/min 115 hp (85 kW) at 5,600 rpm 115 hp (85 kW) at 5,000 rpm 165 hp (121 kW) at 5,500 rpm 195 hp (143 kW) at 5,300 rpm
valve control two overhead camshafts / two valves per cylinder, Roots supercharger
body and frame aluminium body on ladder frame
Wheelbase 2400 mm 2700 mm 2400 mm 2450 mm
curb weight (without driver) 580 kg 630 kg 580 kg 600 kg
top speed 150 km/h (93 mph) 170 km/h (106 mph) 215 km/h (134 mph) 220 km/h (137 mph)

References
  1. "1934 - 1938 Maserati 4CM 1500 Specifications". Ultimatecarpage.com.
  2. "1934 - 1938 Maserati 4CM 1500 - Images, Specifications and Information". Ultimatecarpage.com.
  3. "1932 Maserati 4CM 1100 | Maserati". April 18, 2016.
  4. "Bonhams : 1937 Maserati 4CM Monoposto Chassis no. 1128 Engine no. 1128". www.bonhams.com. Retrieved 2023-02-04.
  5. "1933 Maserati 4CM". conceptcarz.com.
  6. "Maserati 4CM – primotipo…". primotipo...
  7. "Maserati 4CM". Motor Sport Magazine.
  8. "THE GOLDEN ERA OF GP RACING - MAIN DIRECTORY". www.kolumbus.fi.
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