Maserati 4CM 2500

Maserati 4CM 2500


The death of Alfieri Maserati in 1932 seriously affected Maserati’s technical destiny, but, in spite of this, production in the post-Alfieri years was brisk, although less avant-garde. In 1933, at the same time as the design of the two-litre engine destined to power the 4CM 2000, a 2482cc engine with 195hp was made for circuit racing in the Grand Prix category. However, it was only in 1934 that the engine found its perfect partnership with, an albeit rather outdated, chassis with mechanical brakes and a slight longer wheelbase than that of the 4CM 2000.

This car was given to Piero Taruffi who drove it in the Monaco Gran Prix; unfortunately the Italian driver was forced to retire in the final stages of the race whilst in fourth place, the best-placed Maserati driver. The 2500, identified by the prefix “4C” in its Sport version and by “4CM” in its single-seater version, remained a one-off, as did its younger sibling, the 4CM 2000. Later on, having been restored following a breakdown, the 2500cc engine was mounted on a 4CM (single-seater) type chassis. In 1935 the car underwent further improvements and was driven by Nino Farina.

In 1936 it was mounted on a sport chassis, and driven in several racing events by Count Carlo Felice Trossi. The last appearance of the 2500 engine was in 1937, when it was used on a 6CM-type chassis and driven by the Hungarian racing driver László Hartmann.

Technical specifications

Model 4C 2500
Production start 1934
Ignition single-plug, Scintilla magneto
Lubrication dual oil pumps (pressure and scavenge)
Transmission 4-speed + reverse
Chassis ladder frame, with two longitudinal steel girders and cross members
Front suspension leaf springs and friction dampers
Rear suspension leaf springs and friction dampers
Brakes drum brakes on the wheels, mechanical
Brakes drum brakes on the wheels, mechanical
Cooling system water-cooled, centrifugal pump
Length 144.88 in. (3,680 mm)
Width 59.05 in. (1,500 mm)
Height 53.15 in. (1,350 mm)
Wheelbase 96.45 in. (2,450 mm)
Dry weight 1,543 lbs (700 kg)
Tyres fr/rear 5.00x19; Pirelli
Wheels wire wheels
Top speed 136.5 mph (220 km/h)
Bodywork aluminium-bodied two-seater racing or sports car
Fuel tank 25.30 Imp. gall. (115 litres)
Years of activity 1934-1937
First race 1934 - Monaco GP
Engine in-line 4
Bore and stroke 84x112 mm
Total displacement 2,482.6 cc
Compression ratio 5.08.01
Maximum power 195 bhp at 5,300 rpm
Timing gear two valves per cylinder set in a 90°V, twin overhead camshafts
Fuel feed Roots supercharger, a single Weber 55AS1 or DCO carburettor mounted ahead of the supercharger