1933 Maserati 4CM
| |
| Designer(s) | Maserati |
|---|---|
| Production | 1932-1938 |
| Predecessor | Maserati Tipo 26 |
| Successor | Maserati 6CM |
| Technical specifications | |
| Chassis | Steel 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 |
| Length | 3,680–4,000 mm (145–157 in) |
| Width | 1,480–1,500 mm (58–59 in) |
| Height | 1,200–1,350 mm (47–53 in) |
| Axle track | 1,200 mm (47 in) (front and rear) |
| Wheelbase | 2,400 mm (94 in) |
| Engine | 1.1–2.5 L (67–153 cu in) I4 FR layout |
| Transmission | 4 speed manual transmission |
| Weight | 580 kg (1,280 lb) |
| Competition history | |
The Maserati 4CM is an open-wheel Grand Prix motor racing car, designed, developed and built by Italian manufacturer Maserati, in 1931.[2][3]
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
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]
| 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) |
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