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 However, it was only in 1934 that the engine found its perfect partnership with, an albeit rather outdated, chassis with mechanical brakes and a slight longer wheelbase than that of the 4CM 2000.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

Model4C 2500
Production start1934
Ignitionsingle-plug, Scintilla magneto
Lubricationdual oil pumps (pressure and scavenge)
Transmission4-speed + reverse
Chassisladder frame, with two longitudinal steel girders and cross members
Front suspensionleaf springs and friction dampers
Rear suspensionleaf springs and friction dampers
Brakesdrum brakes on the wheels, mechanical
Brakesdrum brakes on the wheels, mechanical
Cooling systemwater-cooled, centrifugal pump
Length144.88 in. (3,680 mm)
Width59.05 in. (1,500 mm)
Height53.15 in. (1,350 mm)
Wheelbase96.45 in. (2,450 mm)
Dry weight1,543 lbs (700 kg)
Tyresfr/rear 5.00x19; Pirelli
Wheelswire wheels
Top speed136.5 mph (220 km/h)
Bodyworkaluminium-bodied two-seater racing or sports car
Fuel tank25.30 Imp. gall. (115 litres)
Years of activity1934-1937
First race1934 - Monaco GP
Enginein-line 4
Bore and stroke84x112 mm
Total displacement2,482.6 cc
Compression ratio5.08.01
Maximum power195 bhp at 5,300 rpm
Timing geartwo valves per cylinder set in a 90°V, twin overhead camshafts
Fuel feedRoots supercharger, a single Weber 55AS1 or DCO carburettor mounted ahead of the supercharger