The first Ferrari car that was fully designed and built by Enzo Ferrari was the Tipo 815; bound by contracts after leaving Alfa Romeo, however, Ferrari was not allowed to call this car a Ferrari ; instead he set up shop under the name AAC (Auto Avio Costruzioni), and strictly speaking the car was named AAC Tipo 815. It was named this because it had an eight cylinder, 1.5 L engine. It showed promise at the Mille Miglia of 1940, but both 815s entered broke down and did not finish