- World Championship class 400Kg in 1939 - World Championship class 450Kg in 1948 - Winner of Trofeo Campari class KD 800Kg in 1949 - Winner of Coppa dell'Oltranza class KD 800Kg in 1949 - Speed World Record class KD 800Kg in 1953 at 241,708 km/h
Name: Arno I°
Year of build: 1939
Engine: Alfa Romeo Tipo 158 1500 cc.
Class: 400 KG.
Pilots: G284 Castoldi Achille (1939>1940)
Today: Destroyed
Name: Arno II°
Year of build: 1946
Engine: Alfa Romeo Tipo 159 1500 cc.
Class: 450 KG.
Pilots: 8 Castoldi Achille (1946>1948), 8 Romani Guido (2020)
Today: Hystoric
Name: Arno VI
Year of build: 1948
Engine: Alfa Romeo Tipo 158 1500 cc. senza compressore
Pilots: 8 Castoldi Achille (1948>1949)
Name: Sant' Ambrogio II°
Year of build: 1949
Engine: Alfa Romeo Daimler-Benz AG601 12000 cc. 1450 HP
Class: Unlimited
Pilots: Castoldi Achille (1949)
Name: Arno VII°
Year of build: 1950
Engine: Ferrari
Pilots: 4 Castoldi Achille (1951)
Engine: Ferrari Tipo 375 4500cc.
Class: KD 800 KG.
Pilots: 60 Castoldi Achille (1951>1953), 33 Oggioni Vittore (1954>1956), 33 Monzino Guido (1957)
Name: Arno VIII°
Year of build: 1951
Engine: Ferrari 12 cilindri in linea 2800 cc.
Pilots: 4 Castoldi Achille (1952)
Name: Arno XI°
Year of build: 1953
Class: KD 800KG.
Pilots: 4 Castoldi Achille (1954>1955), 50 Dell'Orto Fernando (1958>1959)
Year of build: 1954
Engine: Alfa Romeo Daimler-Benz AG601 12000 cc. 1800 HP Moltiplicatore 100/150
Pilots: U1 Castoldi Achille (1954)
Pilots
