Maserati 4CL and 4CLT

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Maserati 4CL
Maserati 4CL - avant droit.jpg
Category Voiturette / Formula One
Constructor Maserati
Designer(s) Ernesto Maserati
Production1939–1950
Predecessor Maserati 6CM
Successor Maserati A6GCM
Technical specifications
Chassis Light alloy ladder
Suspension (front) Independent, torsion springs and friction dampers
Suspension (rear) Live axle, leaf springs and friction dampers
Axle track F: 1,250 mm (49.2 in)
R: 1,276 mm (50.2 in)
Wheelbase 2,500 mm (98.4 in)
Engine 1,491 cc (91 cu in) straight-4 single-stage supercharger front-mounted
Transmission Maserati 4-speed manual
Tyres Pirelli
Competition history
Notable entrants Officine Alfieri Maserati
Scuderia Platé
Scuderia Milano
Scuderia Ambrosiana
Notable drivers Flag of the United Kingdom.svg Johnnie Wakefield
Flag of Italy.svg Luigi Villoresi
Flag of Switzerland (Pantone).svg Toulo de Graffenried
Flag of the United Kingdom.svg Reg Parnell
Flag of Thailand.svg B. Bira
Flag of France.svg Pierre Levegh
Flag of Monaco.svg Louis Chiron
Flag of Italy.svg Giuseppe Farina
Flag of Argentina.svg Juan Manuel Fangio
Flag of France.svg Maurice Trintignant
Flag of Italy.svg Tazio Nuvolari
Flag of France.svg Raymond Sommer
Debut 1939 Tripoli Grand Prix
Wins
6 (pre-war Voiturette)
25 (post-war Grand Prix)
0 (Formula One)

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.

Contents

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 (1.5 L). 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 (1.97 in) wider than the 6CM, and sat lower thanks to repositioned spring hangers.

A 1939 Maserati 4CL 1939 Maserati 4CL Grand Prix (21233811803).jpg
A 1939 Maserati 4CL

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.

A Maserati 4CL at Oulton Park circa 1982 Maserati Oulton Park.jpg
A Maserati 4CL at Oulton Park circa 1982

Race history

4CL Streamliner at Tripoli Grand Prix on 7 May 1939, where it quickly broke down, driven by Luigi Villoresi (1909-1997). 1939-05-07 Tripoli Maserati 4CL Villoresi.jpg
4CL Streamliner at Tripoli Grand Prix on 7 May 1939, where it quickly broke down, driven by Luigi Villoresi (1909–1997).

In the hands of Luigi Villoresi the streamliner took pole position on the 4CL's race debut at the 1939 Tripoli Grand Prix, ahead of Mercedes' brand new W165s. However, both it and two of the three conventional 4CLs entered retired early in the race with engine troubles, leaving the Silver Arrows to take the victory. Embarrassingly for the works team, following this disappointing debut the 4CL's first taste of victory came in the hands of privateer Johnnie Wakefield at the Naples Grand Prix, two races later. Through the remainder of 1939 voiturette races Wakefield took two further victories, and the works' 4CLs picked up another two, before the outbreak of war curtailed international competition. Villoresi took the 4CL to victory in the 1940 Targa Florio, but with entry restricted to Axis countries, and only Maserati fielding a factory team, the opposition was hardly world class.

On the resumption of competition in 1946 the Maserati 4CL proved the class of the field. Luigi Villoresi immediately returned to winning ways, taking victory in the first race following the cessation of hostilities: the 1946 Nice Grand Prix. Tazio Nuvolari and Giorgio Pelassa both took wins in 4CLs, but it was Raymond Sommer and his 4CL who dominated the season. 1947 would prove to be the 4CL's most successful season and, despite Alfa Romeo fielding the revamped 158 and new 308, Maserati drivers picked up 10 individual race victories.

Maserati 4CL Maserati 4CL.jpg
Maserati 4CL

After the replacement of the factory team's 4CLs by the new 4CLT, many examples of the older cars found their way into privateer hands. It was owing to the 4CL's popularity with privateer entrants that many were still being run in top-flight competition at the outset of the Formula One World Championship in 1950.

The 4CLT

Maserati 4CLT
Maserati 4CLT 48 fl.jpg
Category Voiturette / Formula One
Constructor Maserati
Designer(s) Ernesto Maserati
Alberto Massimino
Vittorio Bellentani
Arialdo Ruggieri
Technical specifications
Chassis Light alloy tubular ladder
Suspension (front) Independent, coil springs and hydraulic dampers
Suspension (rear) Live axle, leaf springs and hydraulic dampers
Axle track F: 1,250 mm (49.2 in)
R: 1,200 mm (47.2 in)
Wheelbase 2,500 mm (98.4 in)
Engine Maserati 1491 cc straight-4, two-stage supercharger, front-mounted
Transmission Maserati 4-speed manual
Tyres Pirelli / Ernesto / Dunlop
Competition history
Notable entrants Officine Alfieri Maserati
Scuderia Platé
Scuderia Ambrosiana
Scuderia Achille Varzi
Automóvil Club Argentino
Scuderia Milano
Notable drivers Flag of Italy.svg Luigi Villoresi
Flag of the United Kingdom.svg Reg Parnell
Flag of Switzerland (Pantone).svg Toulo de Graffenried
Flag of Argentina.svg Juan Manuel Fangio
Flag of Monaco.svg Louis Chiron
Flag of Thailand.svg B. Bira
Flag of the United States.svg Harry Schell
Flag of Italy.svg Giuseppe Farina
Debut 1948 San Remo Grand Prix
Wins
18 (post-war Grand Prix)
0 (WC Formula One)
5 (non-Champ F1)

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 (194 kW), 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

1950–1951

1950 saw the introduction of the FIA World Championship of Drivers. In response to improvements to the Alfa 158 and the already competitive Ferrari and Talbot, Maserati again upgraded the 4CLT's engine. A multi-part crankshaft, lightened and balanced rods, a more powerful pair of superchargers and changes to the ignition timing took engine output up to a claimed 280 bhp (209 kW). [1] Coupled to shedding 10 kg (22 lb) from the car's weight, this brought the Maserati up to near-Alfa levels of performance. Although moderately competitive in short runs, the final upgrades proved to be too much for the decade-old powerplant's design and the 4CLT's Grand Prix performance was hindered by engine failures. The season's only Formula One wins came in non-Championship events. Fangio won the Pau Grand Prix on the same day as Parnell took the Richmond Trophy at Goodwood. David Hampshire won the Nottingham Trophy later in the year. Fangio also won the Formula Two Ramparts Grand Prix, at Angoulême, in a 4CLT chassis fitted with an A6GCM engine. The Milano team modified a 4CLT for use in 1950 and 1951, but without success.

Also for 1951 B. Bira modified his '49-spec 4CLT to accept a more powerful, 4,450 cc (271.6 cu in), naturally aspirated OSCA V12 engine. This engine developed around 300 bhp (224 kW). [2] With it Bira won the Goodwood race early in the season, but in its only World Championship appearance, at the 1951 Spanish Grand Prix, it retired on the first lap.

4CLT/50

In late 1949 a number (two or three, depending on source) of the remaining Sanremo cars were converted for use in the Temporada series Formula Libre races in Buenos Aires, Argentina, in the 1949 to 1950 summer season. This model was referred to as the 4CLT/50; although that name is sometimes also applied to the 1950-specification Formula One cars, the Temporada cars are the only ones that were referred to as such by the factory. The modifications were mostly restricted to enlargement of the engine capacity to 1,719 cc (104.9 cu in). [1] Despite these improvements the series was dominated by Ferrari, and following the final race the cars were shipped back to Italy and reconverted to Formula One specifications.

The Platé 4CLT

A long term campaigner of Maserati automobiles, Enrico Platé recognised the Maserati's shortcomings as a Formula One vehicle, and converted a 4CLT/48 into the Maserati-Platé 4CLT Formula Two variant. As F2 was for naturally aspirated cars, the first step was to remove the superchargers. After this, to counteract the resulting loss in performance, the compression ratio was more than doubled and capacity was upped to the class limit of 2.0 L (122.05 cu in). With the lower power output from the revised engine, weight was shed and handling sharpened by reducing the wheelbase.

Final race wins

De Graffenried won the Richmond Trophy, and Giuseppe Farina the Paris Grand Prix, in 1951, but with the switch to Formula Two rules for the World Championship from 1952 onwards, the old 4CLT chassis were found to be overweight and underpowered in comparison to their newer rivals. Despite having been the mainstay of top-flight racing since the end of the 1930s, the 4CL and 4CLT rapidly fell from favour, as smaller and lighter machines began to emerge from European factories still recovering from the effects of war.

Today, many 4CL and 4CLT models survive and are regularly campaigned in historic motorsport events, as well as being on static display in museums.

Technical data

Technical data 4CL 4CLT/48 4CLT/50
Engine:  Front mounted 4-cylinder in-line engine
displacement: 1491 cm3
Bore x stroke: 78 x 78 mm
Max power at rpm: 220 hp at 6 000 rpm260 hp at 7 000 rpm280 hp at 7 000 rpm
Valve control: 2 overhead camshafts, 4 valves per cylinder
Compression: 6.5:16.0:1
Carburetor: Single Weber 45DCODouble Weber 50DCODouble Weber 52DCO
Upload:  Roots compressor Double Roots compressors
Gearbox: 4-speed manual
suspension front: Double cross links, torsion springsDouble cross links, coil springs
suspension rear: Rigid rear axle, leaf springs
Brakes: Hydraulic drum brakes
Chassis & body: Box beam frame with aluminum bodyLadder frame with aluminum body
Wheelbase: 250 cm
Dry weight: 630 kg620 kg
Top speed: 250 km/h270 km/h280 km/h

Complete European Championship results

(key)

YearEntrantChassisEngineDrivers1234
1939 P. Pietsch 4CL Maserati 4CL 1.5 L4 s BEL FRA GER SUI
Flag of Germany (1935-1945).svg Paul Pietsch Ret
J. Wakefield4CL Maserati 4CL 1.5 L4 s Flag of the United Kingdom.svg John Wakefield12
G. Rocco4CL Maserati 4CL 1.5 L4 s Flag of Italy (1861-1946) crowned.svg Giovanni RoccoRet
Source: [3]

Complete Formula One World Championship results

(key)

YearEntrant/sChassis/EngineTyresDriver/s123456789
1950 Scuderia Ambrosiana 4CLT/48 Maserati 4CLT 1.5 L4 s D GBR MON 500 SUI BEL FRA ITA
Flag of the United Kingdom.svg David Murray RetRet
Flag of the United Kingdom.svg David Hampshire 9Ret
Flag of the United Kingdom.svg Reg Parnell Ret
Officine Alfieri Maserati 4CLT/48 Maserati 4CLT 1.5 L4 s P Flag of Monaco.svg Louis Chiron Ret39RetRet
Flag of Italy.svg Franco Rol RetRetRet
Enrico Platé 4CLT/48 Maserati 4CLT 1.5 L4 s P Flag of Switzerland (Pantone).svg Toulo de Graffenried RetRet66
Flag of Thailand.svg B. Bira Ret54Ret
Joe Fry 4CL Maserati 4CL 1.5 L4 s D Flag of the United Kingdom.svg Joe Fry 10 1
Flag of the United Kingdom.svg Brian Shawe-Taylor 10 1
Scuderia Achille Varzi 4CLT/48 Maserati 4CLT 1.5 L4 s P Flag of Argentina.svg José Froilán González RetRet
Flag of Argentina.svg Alfredo Pián DNS
Flag of Italy.svg Nello Pagani 7
4CL Maserati 4CL 1.5 L4 s Flag of Switzerland (Pantone).svg Toni Branca 11
Scuderia Milano 4CLT/50 Speluzzi 1.5 L4 s P Flag of Italy.svg Felice Bonetto 5Ret
Flag of Italy.svg Franco Comotti Ret
Antonio Branca 4CL Maserati 4CL 1.5 L4 s P Flag of Switzerland (Pantone).svg Toni Branca 10
Paul Pietsch 4CLT/48 Maserati 4CLT 1.5 L4 s P Flag of Germany.svg Paul Pietsch Ret
1951 Enrico Platé 4CLT/48 Maserati 4CLT 1.5 L4 s P SUI 500 BEL FRA GBR GER ITA ESP
Flag of Monaco.svg Louis Chiron 7
Flag of the United States (1912-1959).svg Harry Schell 12Ret
Flag of Switzerland (Pantone).svg Toulo de Graffenried RetRet
Flag of Germany.svg Paul Pietsch DNS
Scuderia Milano 4CLT/50 Speluzzi 1.5 L4 s P Flag of Argentina (civil).svg Onofre Marimón Ret
Flag of Spain (1945-1977).svg Paco Godia 10
Flag of Spain (1945-1977).svg Juan Jover DNS
Scuderia Ambrosiana 4CLT/48 Maserati 4CLT 1.5 L4 s D Flag of the United Kingdom.svg David Murray RetDNS
John James 4CLT/48 Maserati 4CLT 1.5 L4 s D Flag of the United Kingdom.svg John James Ret
Philip Fotheringham-Parker 4CL Maserati 4CL 1.5 L4 s D Flag of the United Kingdom.svg Philip Fotheringham-Parker Ret
Antonio Branca 4CLT/48 Maserati 4CLT 1.5 L4 s P Flag of Switzerland (Pantone).svg Toni Branca Ret
Prince Bira 4CLT/48 OSCA 4500 4.5 V12 P Flag of Thailand.svg B. Bira Ret
1952 Enrico Platé 4CLT/48 Platé 2.0 L4 P SUI 500 BEL FRA GBR GER NED ITA
Flag of Switzerland (Pantone).svg Toulo de Graffenried 6Ret 1 19DNQ
Flag of the United States (1912-1959).svg Harry Schell RetRet 1 17
Flag of Argentina.svg Alberto Crespo DNQ
Fadely-Anderson/R.A. Cott4CLT/48 Offenhauser 4.5 L4 F Flag of the United States (1912-1959).svg Carl Forberg DNQ
1953 Fadely-Anderson/R.A. Cott4CLT/48 Offenhauser 4.5 L4 F ARG 500 NED BEL FRA GBR GER SUI ITA
Flag of the United States (1912-1959).svg Spider Webb DNQ
1957 Morgan Engineering4CLT/48 Maserati 4CLT 1.5 L4 s F ARG MON 500 FRA GBR GER PES ITA
Flag of the United States (1912-1959).svg Danny Kladis DNQ
Source: [4] [5]
Notes

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References

  1. 1 2 Parker (2011), p. 19
  2. Parker (2011), p. 30
  3. Snellman, Leif. "1939 Index". The Golden Era of Grand Prix Racing. Archived from the original on 2022-12-02.
  4. "Formula 1 1950". OldRacingCars. Retrieved June 25, 2019.
  5. "Formula 1 1951". OldRacingCars. Retrieved June 25, 2019.