The new course measured 6,300 metres (3.91 mi) and was used through 1954. The new grandstand with 2,000 seats, a restaurant on the ground floor, and a turret for timers; 30 refuelling pits built of masorny; a monumental track entrance; a number of additional garages; various service buildings added or rebuilt were the main changes made to the facilities just before World War II. They could be utilized only during a few testing sessions such as those of the untried Alfa Romeo 512 with rear engine and the supercharged 4cylinder Bianchi 500. The war interrupted all sports activity and while it lasted the autodrome was used for various purposes including that of refuge for the Public Automobile Registry archives, some of the Milan Automobile Club's offices, and even the animals removed from the Milan zoo.

In April, 1945, the grandstand straight was host to a parade of Allied armoured vehicles, which broke up the track. A little later, large areas were used for storage of military vehicles and war surplus, mainly in the southern part of the circuit. Besides the track, the pits, buildings and stands also suffered from this situation and little remained that was useable. At the beginning of 1948 the Milan Automobile Club decided on complete restoration of the autodrome. Once again, in a very short lapse of time of less than two months, the facilities were restored to their original functionality. Structures were put back in order and the modifications planned in 1938 and never put in effect were finally applied.

The major Italian events for cars and motorcycles in 1948, which had already been planned, were held on the Valentino circuit in Turin for cars, and at Faenza for bikes. But that same year the reborn Monza Autodrome held the autodrome Grand Prix on October 17th, a Formula 1 race which was won by the Frenchman Wimille with an Alfa Romeo 158. One week later the short autumn season ended with last race of the Italian motorcycle championship. It is difficult to make a technical comparison between the new road course and the last "Florio" with its chicanes prepared for the 1938 Grand Prix.

1950 Italian GP:
a group of cars at the porphyry turn.

Whereas the 1938 Grand Prix single-seaters had a swept volume of 3,000 cc, the new ones had supercharged 1,500 cc engines or 4,500 cc, unblown engines. For motorcycles, supercharging and special fuels had been prohibited. The 188 km/h (117 mph) fastest lap made by Sanesi with an Alfa Romeo in the automobile Grand Prix, and especially the lap averages made in the motorcycle Grand Prix - 177 km/h for the 125 cc, 144 km/h for the 250 cc, 160 km/h for the 500 cc - showed that the new road circuit had to be considered faster than the "Florio circuit" of 10 years before. With its renewed facilities the Autodrome was host to all the events between 1949 and 1954. During this period accommodation for the public was in particular improved with small covered stands on the outside of the second "porphyry" bend and the second Lesmo curve. Other small stands were installed at the "porphyry" bends while a number of boxes were built for the public on the roof of' the refuelling pits.

The 6,300-metre road circuit witnessed numerous formula changes for Grand Prix cars with the 1,500/4,500 cc Formula 1 up to 1951, the 2,000 cc Formula 2 in 1952 and 1953, and the new 2,500 cc Formula 1 in 1954. For this reason it is difficult to evaluate the technical and functional developments of these cars on the basis of performance at Monza. Contrarily, motorcycling results are a clear indication of the increased speed achieved, first by progressively increasing specific power, and second, mainly by having continuously more complete recourse to aerodynamic fairings. In 1954 general averages rose to 146 km/h (90 mph) for the 125 cc bikes and nearly 180 km/h (112 mph) for the 500 cc class.

In the meantime the activies of the autodrome had been enriched by a number of events including the Inter Europe Cup for Touring cars introduced in 1949, the Autodrome Grand Prix reserved for Formula 2 single- seaters (except in 1953 when it was run with International Sports Cars), and it was sometimes coupled with the Monza Lottery. In 1954 Lottery prizes were awarded according to the outcome of the Supercortemaggiore Grand Prix, a 1,000 kilometre (620 mi) race sponsored by Italy's major oil company and reserved for Sports category cars up to 5,000 cc. This race was won that year by Mike Hawthorn in a Ferrari and the second year by Jean Behra in a Maserati.

1951 GP delle Nazioni: Milani's Gilera went ahead Oliver's Norton at sidecar's race.
Changes during the years  Back to Top
1922/1928 Construction and first races on the original tracks.
1929/1939 In consequence of the Materassi's accident, races are run on the alternative tracks
1940/1954 After the war interruption, the activity starts again in 1948
1955/1971 Construction of the high speed track and other important works
1972/1978 Chicane and variants to reduce the high speed
1979/1988 New works to update the circuit
1989/1997 New pit complex and the interventions for the security
1998/OGGI New hospitality buildings and the technological modernizations

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