Clemar Bucci achieved his first successes in motorsport in his home country Argentina. In 1950 he finished third at the Evita Peron Cup in Buenos Aires with a 4.5 liter Alfa Romeo . He regularly competed in national races in the Alfa Romeo in the early 1950s. In 1953, Clemar Bucci received the order from Autoar to subject the Cisitalia Tipo 360 , which had been made ready to drive by Ing.Giovanni Rossi, on the airport road in Buenos Aires for a record-breaking run of the flying kilometer. Due to burned-out pistons, the car achieved an average speed of just 233.010 km / h on June 18, 1953, which was enough for the South American speed record. In 1954 he tried to qualify for the Argentine Grand Prix with his old Alfa Romeo . Bucci was disqualified even before the first training session because he refused to wear a helmet.
In 1954 he came to Europe and became a member of the Gordini factory team . Bucci drove his first world championship run of the automobile world championship in Silverstone . At the British Grand Prix he started with a Gordini Type 16 . The race ended prematurely after an accident. In all four works outings in 1954, Bucci did not even see the checkered flag. Even his last race in Formula 1, which he in 1955 with a plant - Maserati 250F drove in Buenos Aires, ended after a defect in the fuel line with a loss.
In the same year he drove a 2.5-liter Ferrari in the Formula Libre race, which was also held in Buenos Aires. 400,000 spectators, more than twice as many as at the Grand Prix race, watched the event. Bucci finished ninth. In 1955 he also shared the cockpit of a factory Ferrari with Umberto Maglioli at the 1000 km race in Buenos Aires . At the end of the race, the two did not make it into the ranking after having driven too few kilometers through a few pit stops.