In 1938, Ferrari left Alfa Romeo after running Scuderia Ferrari as their racing division. The agreement ending their association forbade Ferrari from restarting Scuderia Ferrari within the next four years. Ferrari then founded Auto Avio Costruzioni (AAC) in Modena to manufacture aircraft parts for the Italian government
In December 1939, AAC was commissioned by Lotario, Marquis di Modena, to build and prepare two racing cars for him and Alberto Ascari to drive in the 1940 Brescia Grand Prix. The race, a successor to the Mille Miglia, was to be run in April 1940. The resulting car was named theAAC Tipo 815.
The 815 was designed and developed by ex-Alfa Romeo engineers Alberto Massimino and Vittorio Bellentani and by Enrico Nardi. The designation "815" was based on the car's eight-cylinder, 1.5 L engine. This engine was largely based on the four-cylinder, 1.1 L engine of the508 C Balilla 1100. In concept, it was two 508C engines placed end to end, but it used a specially designed aluminium block built by Fonderia Calzoni in Bologna for integrity and light weight and a five-bearing crankshaft and a camshaft designed and built by AAC to get the traditional straight-8 timing and balance. The engine used Fiat valve gear, cylinder heads (two 508C heads per engine), and connecting rods. The engine was high-tech for the time, with a single overhead camshaft, two valves per cylinder, and a semi-dry sump lubrication system. Four Weber 30DR2 carburettors were specified for a total output of 75 hp (56 kW) at 5500 rpm.
The 815 used a Fiat four-speed transmission with the Fiat gears replaced by gears made in-house bt AAC. The transmission was integral to the engine block. The car had independentDubonnet suspension with integral shock absorberat front, with a live axle on semi-elliptic leaf springs and hydraulic shock absorbers at the rear.
The bodywork was done by Carrozzeria Touring using Itallumag 35, an aluminium/magnesium alloy, and was done in long, flowing forms with integrated wings. The bodywork weighed 119 lb (54 kg). The complete car weighed 625 kg (1,380 lb) and attained a maximum speed close to 170 km/h (110 mph).
Performance at 1940 Brescia Grand Prix
Two 815s, numbers 020 and 021, were completed and entered in the 1940 Brescia Grand Prix, which ran nine laps of a 103 miles (166 km) street circuit. Rangoni and Nardi raced in 020, while Ascari and Giuseppe Minozzi raced in 021. After leading the 1500 cc class in the first lap, Ascari's car developed valve problems and broke down. Rangoni then took the lead, set the lap record for the class, and had a lead of more than half an hour when his engine failed after seven laps.
After the Second World War
Lotario Rangoni died during the Second World War and his brother, Rolando, inherited car no. 020. The car was scrapped in 1958.
Ascari's car, no. 021, was sold to racer Enrico Beltracchini who raced it in 1947. After selling the car to a museum and then buying it back, Beltracchini sold it again to Mario Righini. As at 2006, Type 815 no. 021 was still in Righini's collection.