The Maserati 4CL and its derived sister model the Maserati 4CLT are single-seat open-wheel Grand Prix racing cars that were designed and built by Maserati. The 4CL was introduced at the beginning of the 1939 season, as a rival to the Alfa Romeo 158 and various ERA models in the voiturette class of international Grand Prix motor racing. Although racing ceased during World War II, the 4CL was one of the front running models at the resumption of racing in the late 1940s. Experiments with two-stage supercharging and tubular chassis construction eventually led to the introduction of the revised 4CLT model in 1948. The 4CLT was steadily upgraded and updated over the following two years, resulting in the ultimate 4CLT/50 model, introduced for the inaugural year of the Formula One World Championship in 1950. In the immediate post-war period, and the first two years of the Formula One category, the 4CLT was the car of choice for many privateer entrants, leading to numerous examples being involved in most races during this period.
The 4CL
Design
In the late 1930s, continued rapid development in the increasingly competitive international voiturette class, and the introduction of the Alfa Romeo 158 and ERA B- and C-type models, forced the Maserati brothers into designing a new, square-bore, inline-4-cylinder engine, with a bore and stroke of 78 mm for a total displacement of 1,490.85 cc. This new engine developed 30–50 bhp more than the previous inline-6, the increase mostly achieved through an increase to four valves per cylinder, coupled to the use of a more powerful supercharger and a small increase in the compression ratio. Following customary Maserati practice, the engine was mounted into a chassis design almost identical to that of the 4CL's predecessor: the Maserati 6CM. Conventional in its architecture, twin box-section spars ran the length of the car joined, ladder-fashion, by smaller cross members, although the 4CL design did incorporate more aluminium componentry than its forebear. Although near-identical in its wheelbase, the 4CL's track was a full 5 cm wider than the 6CM, and sat lower thanks to repositioned spring hangers.
Enveloping this rather conservative chassis was a low, curvaceous alloy-panel body, built in-house by Maserati. Maserati also built a streamlined version of the 4CL from the outset. Continued engine development, in response to Alfa Romeo's post-war introduction of two-stage supercharging, began to expose weaknesses in the chassis design. In an attempt to improve torsional rigidity Maserati began to experiment with tubular section chassis members. These experimental models ran alongside conventional 4CLs throughout the 1947 season, and eventually led to the introduction of the 4CLT in 1948.
The 4CLT
Chassis and engine changes made to the experimental 4CLs eventually coalesced into the 4CLT, the appended T denoting its tubular chassis. The improvements in torsional rigidity that the tubular construction brought were required to counteract the increases in torque and power resulting from the twin-supercharger upgrade of the elderly inline-4 engine. Power was up to approximately 260 bhp, from the 4CL's 220. Other changes included the use of roller bearings for the crankshaft, forged (rather than cast) rear suspension components, and the chassis was designed to run with hydraulic dampers from the outset.
4CLT/48 Sanremo
The first variant of the 4CLT earned its "Sanremo" nickname from the first race for which it was entered: the 1948 San Remo Grand Prix. The name stuck, as Alberto Ascari took his 4CLT to victory in its maiden race appearance. A portent of things to come, Villoresi and Reg Parnell won five of the 1948 season's remaining races. In the first year of the Formula One World Championship, a Sanremo scored what was to be the Maserati's best Championship finish, when Louis Chiron took third place at his home Grand Prix: the 1950 Monaco Grand Prix. The last 4CLT variant to compete in the World Championship was a 4CLT/48 modified by the Arzani-Volpini team, that failed to even qualify for the 1955 Italian Grand Prix.
1949
Technical data
Complete European Championship results
(key)
Complete Formula One World Championship results
(key)
- Notes
- – Indicates shared drive
External links
References
- Parker (2011), p. 19^
- Parker (2011), p. 30^
- Leif Snellman. 1939 Index The Golden Era of Grand Prix Racing^
- Formula 1 1950