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In 1958, Abarth updated their small ‘750 GT Zagato' racecar and renamed it ‘750 Record Monza Zagato'. The most significant upgrade was a new DOHC cylinder head specially designed for the Fiat 600D engine. As early as 1956, Abarth had already built up a reputation as a premier tuner of Fiat engines and was branching out into many motorsport classes. To compete in the 750cc class of the Grand Touring Championship, Abarth commissioned Zagato to rebody the Fiat 600 into a purposeful racecar.
A number of prototype cars were made in 1956; one appeared at the 1956 Mille Miglia to place second in class. Thanks to Zagato's weight-saving body, the first cars weighed 1179 lbs (535 kg) and took advantage of Abarth's 747cc tuned engine. With a high compression head and specially made exhaust, the power was rated at 47 bhp @ 6000 rpm.;
The production 'Zagato 750 GT' debuted at the 1956 Geneva Motor Show, and the first cars were sold at the beginning of 1957. The final design included twin bumperettes, Zagato's double-bubble roof, and twin intakes on the rear engine cover. Five of these cars finished the Mille Miglia in 1957, and Alfonso Thiele won the 750cc class.
In July of 1957, Abarth committed to funding a record-breaking car with a sleek Pininfarina-designed body, tube frame chassis, and 747cc engine. Raced around the Monza circuit for four days, the car took 15 new records, including the fastest average speed of 165.376 kph for 72 hours straight.
At the 1958 Paris Motor Show, Abarth launched and renamed the ‘750 GT Zagato' into the ’750 Record Monza Zagato'. This was done to honor the record-breaking car's results a year earlier. Along with the new name came design updates. The engine now had the specially-made DOHC cylinder head, which raised horsepower to 57 bhp. Zagato also modified the rear end to include three-quarter windows. Aa' Record Monza' badge fitted to both DOHC and the single-cam car was included on the window posts. Zagato also opted for a standard roof over the double-bubble used on the first series of vehicles.
During the 1959 season, the more potent record Monza racked up an impressive series of victories. Four of these cars contested the 12 Hours of Sebring entered by Team Roosevelt with complete factory support. The cars finished 1-2-3-4 and were predominantly featured in the American press. This success continued overseas, both in circuit racing and in hill climbs.
The success of the Record Monza caught the world's attention. In the following years, Abarth raced similar cars powered by 850cc and 1-liter engines. Called Biaberos, they weren't bodied by Zagato and instead finished at Abarth's workshops.
Specifications:
type Racing Car
built in Turin, Italy
engine Inline-4
position Rear, Longitudinal
aspiration Natural
valvetrain DOHC, 2 Valves per Cyl
fuel feed 2 Twin-Choke Weber 36DCL4
displacement 747 cc / 45.6 in³
bore 61 mm / 2.4 in
stroke 64 mm / 2.52 in
compression 4.3:1
power 42.5 kw / 57 bhp @ 7000 rpm
output 76.31 bhp per litre
bhp/weight 100.0 bhp per tonne
driven wheels RWD
front tires 5.20×12
rear tires 5.20×12
front brakes Drums
rear brakes Drums
steering Worm & Sector
f suspension Upper Trailing Arms w/Lower Transverse Leaf Spring, Hydrualic Dampers
r suspension Trailing Arms w/Coil Springs, Hydraulic Dampers,
curb weight 570 kg / 1257 lbs
wheelbase 2000 mm / 78.7 in
front track 1150 mm / 45.3 in
rear track 1160 mm / 45.7 in
length 3470 mm / 136.6 in
width 1350 mm / 53.1 in
height 1140 mm / 44.9 in
transmission 4-Speed Manual
top speed ~190 kph / 118.1 mph
Source: SuperCars
Images: Zagato; www.bernimotori.com
