Following modest success with the supercharged 125 F1 car, Ferrari decided to switch to the 4.5-litre naturally aspirated formula for the 1950 Formula One season. Enzo Ferrari appointed Aurelio Lampredi as technical director, replacing Gioacchino Colombo, with a directive to develop a new large-displacement V12 engine.
Lampredi's initial work resulted in the experimental 275 S, two racing barchettas based on the 166 MM but featuring a 3.3-litre V12. These cars raced at the 1950 Mille Miglia on April 23, where one held the overall lead before both retired due to mechanical failure.
The 275 F1, equipped with the same 3.3-litre (3322 cc/202 in³) version of Lampredi's new engine, debuted at the Grand Prix of Belgium on June 18. The engine, featuring three Weber 42DCF carburetors, a single overhead camshaft per cylinder bank, and two valves per cylinder, produced 300 hp (224 kW) at 7200 rpm. Alberto Ascari drove the car to a fifth-place finish, marking the final appearance of the 3.3-litre engine.
On July 30, 1950, at the Grand Prix of Nations in Geneva, the 275 was replaced by the 340 F1. This car featured a larger 4.1-litre (4101.66 cc/250 in³) version of Lampredi's V12. Other modifications included a new de Dion tube rear suspension, derived from the 166 F2 car, and a four-speed gearbox. The 340 F1 had a longer 2,420 mm (95 in) wheelbase, while other dimensions remained consistent. With 335 hp (250 kW), Ascari was able to compete with Juan Manuel Fangio's Alfa Romeo 158 but retired due to engine trouble. The 340 F1 served as an intermediate step in Ferrari's 1950 car development.
Ferrari achieved its 4.5-litre goal with the 375 F1, two of which debuted at Monza on September 3, 1950. This 4.5-litre (4493.73 cc/274 in³) engine produced similar power to its 4.1-litre predecessor, but its tractability allowed Ascari to secure second place in its debut race.
A series of modifications throughout the 1951 season enabled Ferrari to surpass Alfa Romeo in Formula One. José Froilán González's victory at Silverstone on July 14 marked Ferrari's first World Championship win. Ascari's subsequent wins at the Nürburgring and Monza, combined with strong finishes throughout the season, established Ferrari as a significant contender in Formula One.
Changes in Formula One regulations led Ferrari to adapt the large V12 engine for an Indy car, resulting in the 1952 375 Indianapolis. This iteration featured three new Weber 40IF4C carburettors, increasing power output to 380 hp (279 kW). The wheelbase was lengthened, and both the chassis and suspension were reinforced. Despite performing well in European testing, the car struggled to meet the American challenge. Only one of the four 375s qualified for the 1952 Indianapolis 500. Ascari, the qualifying driver, started 25th out of 33 with a qualifying speed of 134.3 mph. He was classified 31st, completing only 40 of the 200 laps before retiring with wheel failure. However, Ascari went on to win the remaining six Grands Prix of the season, securing his first World Championship ahead of Ferrari teammate Giuseppe Farina.
The large V12 engine was discontinued for Formula One in 1954, as the regulations mandated a 2.5-litre engine. The new 553 F1 adopted Lampredi's four-cylinder engine, reserving the V12 for sports car applications.
In 2011, then-current Ferrari driver Fernando Alonso drove the 375 during the British Grand Prix weekend. This tribute commemorated the sixtieth anniversary of Ferrari's first World Championship Grand Prix win at the 1951 British Grand Prix at Silverstone, achieved by Argentinean driver José Froilán González.
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