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]