The AIACR also stipulated that their Grand Épreuves had to run for a minimum of 500 km. In the USA the | AAA, facing the same issues, chose a fuel-consumption formula instead – 45 US gallons for the Indianapolis 500. There was no restriction on the choice of fuel that could be used. The minimum width, at the driver's seat, had to be 850mm. The regulations stipulated a maximum weight of 750 kg, calculated excluding the driver, fluids and tyres. However, it underestimated the advances made in metallurgy and using lightweight materials. It effectively outlawed the Italian twin-engine models. So it was seen as the way to limit increasing speeds because the bigger engines and superchargers would weigh more. The trend to now from the manufacturers had been to build bigger engines to get more power. The 1934 season was a landmark year, which saw the introduction of the new 750 kg formula. Multiple classes are mentioned when they were divided and run to different race lengths. This was one of the major watershed racing seasons, that saw one of the most abrupt shifts between the old and new regimes as the balance-of-power in European racing moved from Italy to Germany.Ī pink background indicates the race was run for Sports Cars or Touring Cars this year, while a grey background indicates the race was not held this year. Mercedes went on to win the Italian and Spanish races, while Auto Union won the inaugural Swiss Grand Prix at the new Bremgarten circuit. It started tragically with Faglioli's win at Pescara when Moll was killed closing in on the lead. A controversial Customs decision kept the German teams out of the Belgian Grand Prix but they were back with a vengeance in the second half of the season. The German cars were fast but prone to new-car unreliability however, Hans Stuck was able to claim Auto Union's first victory at their home Grand Prix. His team-leader Louis Chiron had crashed out of the lead at Monaco, but took victory in the French Grand Prix. Then, in a special, aerodynamic Alfa Romeo, he won the Avusrennen that saw the first appearance of Auto Union. Scuderia Ferrari, running the Alfa Romeos, won the Monaco Grand Prix with their new signing, the young Franco-Algerian Guy Moll. 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 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. 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 1934 Grand Prix season saw the advent of the new 750 kg Formula.

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