Ballot was a French manufacturer, initially of engines, that also made automobiles between 1919 and 1932. Édouard Ballot became well known as a designer of reliable engines. He helped Ettore Bugatti in developing his first engines.
Élie Marcel Bayol was a French racing driver who raced in Formula One for the O.S.C.A. and Gordini teams. Bayol also raced sports cars, mostly driving DB-Panhards for the Deutsch Bonnet works team including winning the 750cc class and Index of Performance at the 1954 24 Hours of Le Mans.
The 1931 24 Hours of Le Mans was the 9th Grand Prix of Endurance that took place at the Circuit de la Sarthe on 13 and 14 June 1931.
The 1935 Grand Prix season was the second year of the new 750 kg Formula. The success of the previous year encouraged the AIACR to reinitiate the European Championship. It was composed of the seven national Grands Prix and was won by Rudolf Caracciola, driving for the Mercedes-Benz team. The team dominated the season winning five of those Grand Épreuves, as well as four of the other major races of the season. However, in one of the great motor-races in sporting history, Tazio Nuvolari in a Scuderia Ferrari Alfa Romeo beat the combined numbers of the German teams in their home Grand Prix. The season also saw the arrival on the international stage of the bright young talent Bernd Rosemeyer in the Auto Union team.
The 1931 Grand Prix season was a watershed year, with the advent of the AIACR European Championship. After several years of Grand Prix racing in the doldrums with little technical development, 1931 saw new models come from all three main manufacturers: Bugatti, Maserati and Alfa Romeo.
The 1932 Grand Prix season marked the second year of the AIACR European Championship. It saw the debut of Alfa Romeo's sensational new Tipo B and with it, Tazio Nuvolari won the Championship driving for the Alfa Corse works team. The 40-year old Nuvolari won two of the three rounds and was second in the other. Still running to a Formula Libre rules for the cars, the regulations were revised to set the races to be between five and ten hours. However, all three national committees ran their races to the minimum time-limit.
The 1933 Grand Prix season was an intermediate year, as it would be the last season for the current AIACR regulations before a new weight-formula was introduced in 1934. As such, the European Championship was not held and the manufacturers held back on further developments of their existing models. Alfa Romeo, following an Italian government financial bailout and like Mercedes-Benz the previous year, had shut down its Alfa Corse works team. Scuderia Ferrari, their regular customer team took up the role of racing Alfa Romeos and a number of ex-works drivers moved across to join their ranks. They were not allowed, however, to buy the impressive Tipo B that had been so dominant in the previous season.
The 1934 Grand Prix season saw the advent of the new 750 kg Formula. In an effort to curb the danger of rising speeds, the AIACR imposed this upper weight limit that effectively outlawed the large capacity engines. The incumbent manufacturers Alfa Romeo, Maserati and Bugatti had been preparing their new models with varying success – the best of which was the Alfa Romeo Tipo B. However, it was the state-sponsored arrival of the two German teams, Mercedes-Benz and Auto Union, and their innovative and progressive cars that ignited a new, exciting era of motor racing.
The 1925 Grand Prix season was a watershed year in motor racing. It was the first year for the new AIACR World Manufacturers' Championship season. The championship was won by Alfa Romeo, with its P2 model.
The 1926 Grand Prix season was the second AIACR World Manufacturers' Championship season and the first running to new 1.5-litre regulations. The championship was won by Bugatti and its Type 35 was the dominant car of the year.
The 1927 Grand Prix season was the third AIACR World Manufacturers' Championship season and the second run to a 1.5-litre engine limit. In a dominant display, the championship was won by Delage, with team driver Robert Benoist winning four of the five Grand Prix.
The 1928 Grand Prix season saw the Monegasque driver Louis Chiron, and his Bugatti, take seven Grand Prix victories.
The 1922 Grand Prix season had several notable events during the year. The AIACR governing body brought in a 2-litre formula for Grand Prix. French companies brought out straight-8 engines for their cars but it was FIAT's 6-cylinder engine that took the trophies. Veteran Felice Nazzaro won the French Grand Prix, held near Strasbourg. It was a tainted victory though, as Nazzaro's nephew was killed when his FIAT's suspension broke in the latter stages of the race. An almost identical accident also happened to team-mate Pietro Bordino, though he was only slightly injured. Pierre de Vizcaya's Bugatti finished second, nearly an hour behind.
The 1924 Grand Prix season saw Grand Prix motor racing spread further across Europe and North America. In Italy a number of new open-road events were held. In France two new circuits were opened – at Montlhéry near Paris and Miramas near Marseille.
The 1929 Grand Prix season was another interim year, where most races were run to Formula Libre rules due to a lack of regulations from the AIACR that would be popular for race organisers and manufacturers. This blurred the line between racing cars and sports cars with both competing in the same races. Bugatti won the major international races, with their drivers Louis Chiron and "W Williams". The Italian Championship proved very competitive, attracting many top drivers. There it was Alfa Romeo, using their 4-year old P2 model that claimed more victories, than their main competition coming from Bugatti and Maserati.
The 1930 Grand Prix season continued the malaise that had taken over the sport. Although there was little technical advance more privateer teams were forming, getting some factory support. The AIACR continued to mandate its fuel-regulated Formula Libre rules. Across the Atlantic, the AAA abandoned the AIACR regulations. Their new regulations were derisively called the “Junk Formula” by purists, opening up to their own version of Formula Libre: with modified stock-standard cars of up to 366 cu in (6-litres) with two seats.
The 1925 French Grand Prix was a Grand Prix motor race held at Autodrome de Linas-Montlhéry on 26 July 1925. It was the third race of the inaugural AIACR World Manufacturers' Championship. The race, which was 80 laps, was won by Robert Benoist driving a Delage 2LCV after starting from 8th place.
The 1926 Targa Florio was a Grand Prix motor race held on the 108km Medio Circuito Madonie in Sicily, Italy on 25 April 1926. There were two separate races held simultaneously, one for up to 1100cc Cyclecars held over 3 laps for a total distance of 324km, and the main race for Formula Libre cars over 5 laps for a total distance of 540km. The longer race also featured the 1926 Coppa Florio which was open only to factory entered cars. The Cyclecar race was won by Baconin Borzacchini driving a Salmson, while the longer race and Coppa Florio were won by Meo Costantini in his factory entered Bugatti.
The 1926 Milan Grand Prix was a Grand Prix motor race held at Monza on 12 September 1926. The race was held over 40 laps of the 10 km circuit, for a total race distance of 400 km. The race was won by Bartolomeo Costantini driving a Bugatti.
The 1927 Targa Florio was a Grand Prix motor race held on the 108km Medio Circuito Madonie in Sicily, Italy on the 24th of April 1927. There were two separate races held simultaneously, one for up to 1100cc Cyclecars held over 3 laps for a total distance of 324km, and the main race for Formula Libre cars over 5 laps for a total distance of 540km. The Cyclecar race was won by Baconin Borzacchini driving a Salmson, while the main race was won by Emilio Materassi in his factory entered Bugatti.
Meo Costantini 
