Back on the racetrack, the 33/3 allowed Alfa Romeo to return to the struggle for overall leadership in the Sport category. The number three after the slash indicates a cylinder capacity of 3.0 litres. The chassis differs from that of the 33/2 due to an Avional box section structure with titanium elements. The car's new engine developed 400 bhp at 9000 rpm. The six speed gearbox hung over the rear wheels and the body was open. The car made its first appearance in Spring 1969 and during the same year was overall winner at Zeltweg (Austria) and Enna (Sicily). In 1970, the 33/3 came in 2nd overall at the Imola 500 km race and the Zeltweg 1000 kilometre race. The engine was upgraded to 420 bhp in 1971. The gearbox, judged to be the car's weak point, was rebuilt with five frontal gears. The front tyres were reduced to 13" and the weight from 700 kg to 650 kg. The results were soon felt. In 1971, the 33/3 took the Brands Hatch 1000 km race with De Adamich-Pescarolo at the wheel, the Targa Florio with Vaccarella-Hezemans, and the Watkins Glen 6 Hour race with De Adamich-Pescarolo. These successes and other great placings won Autodelta second place in the World Makes table.
AUTODELTA 33/3 Short Tail
The Autodelta design department did not rest on its laurels and by the end of 1970 they had a new version ready with a tubular aluminium alloy frame known as the 33/3 TT. This car featured a driving position set far forward. In 1972, after a long test period, it took second place in the Makes Championship. But the 33 did not really come into its own until 1975.
AUTODELTA 33 / TT3
The beautiful V8 Engines, 2998cc - 440 CV - 9800rpm
A now-perfect chassis and the felicitous arrival of the 500 bhp 12 cylinder boxer engine developed by Autodelta created ideal conditions for almost total domination. The car bagged the World Championship with seven wins in the eight races entered: at Dijon, Monza, Nurburgring, with Arturo Merzario and Jacques Laffite; at Spa, Zeltweg and Watkins Glen with Henry Pescarolo and Derek Bell; at Pergusa again with Merzario - this time paired with Jochen Mass.
AUTODELTA 33/TT12 World Campionship 1975 - the Drivers Pescarollo, Bell, Merzario, Brambilla with Ing.C.Chiti
Only six units of the 33 TT 12 were ever built. Autodelta's main adversaries fought back after it swept the board, but Autodelta made a comeback to take the 1977 title again with the 33 SC 12 that won all eight scheduled races with Arturo Merzario and Vittorio Brambilla at the wheel. Apart from taking the Championship, the 33 SC 12 set numerous records over all the major European circuits: an average speed of 144.225 km/h on the short Paul Ricard circuit, an average speed of 203.820 km/h over the winding Salzburg circuit in Austria.
The very first Autodelta V12 Turbo engine made its appearance on this car: during the same period, Renault introduced its Formula 1 Turbo 1.5 engine. Renault's turbo engine was fed from both cylinder rows while the Alfa V12 Turbo adopted the approach of dividing the engine in two with one turbo per row. This engineering feature was copied by many manufacturers the following year. The 33 SC 12 engine developed 520 bhp at 12,000 rpm. The engine of the 33 SC 12 biturbo KKK that won on its first ever outing at Salzburg developed 640 bhp at 11,000 rpm.
AUTODELTA - ALFA ROMEO 33 SC12 Turbo World Campionship 1977