Alfa Romeo Tipo P1 was the first Grand Prix car made by Alfa Romeo in 1923. The car had a 2.0 L straight-6 engine and it produced 95 bhp at 5000 rpms. Two cars were entered in the Italian GP at Monza in 1923, one for Antonio Ascari

Antonio Ascari

Antonio Ascari was an Italian Grand Prix motor racing champion.Antonio Ascari was born near Mantua, in the Lombardy region of Italy, as the son of a corn dealer. He began racing cars at the top levels in Italy in 1919, using a modified 1914 Fiat...

 and one for Ugo Sivocci

Ugo Sivocci

Ugo Sivocci was an Italian race car driver.Born in Salerno, Sivocci started his racing career with bicycle racing. After World War I, he worked as an auto mechanic in Milan. Being a friend of Enzo Ferrari, he was hired by Alfa Romeo in 1920 to drive Alfa in three-man works team: with Antonio...

. When Sivocci was practicing for the GP in September 1923 he crashed and was killed. Alfa Romeo withdrew from the competition and development of the car was stopped. In 1924 a new version with Roots-compressor was made and became the P1 Compressore 1924.

In 1923 Vittorio Jano

Vittorio Jano

Vittorio Jano was an Italian automobile designer of Hungarian descent from the 1920s through 1960s.Jano was born Viktor János in San Giorgio Canavese, in Piedmont, to Hungarian immigrants, who arrived there several years before the birth of Jano. He began his career at the car and truck company...

 was hired to Alfa Romeo to design new car and P2

Alfa Romeo P2

The Alfa Romeo P2 won the inaugural Automobile World Championship in 1925, taking victory in two of the four championship rounds when Antonio Ascari drove it in the European Grand Prix at Spa and Gastone Brilli-Peri won the Italian Grand Prix at Monza after Ascari died while leading the intervening...

was born.