Alfa Romeo Tipo 33

Alfa Romeo Tipo 33

5 produced 270 bhp @ 9,600 rpm Alfa Romeo started development of the Tipo 33 in the early 1960s, with the first car being built in 1965. It was sent to Autodelta to be completed and for additional changes to be made. It used a straight-4 engine from the TZ2, but Autodelta fitted it with a bespoke V8 engine soon after. The 1995 cc V8 engine has a bank angle of 90° and is rated at 270 hp at 9,600 rpm, with a large-diameter tube frame. The Tipo 33 mid-engine prototype debuted on 12 March 1967 at the Belgian hillclimbing event at Fléron, with Teodoro Zeccoli taking the win for Alfa Romeo.

The first version was nick named the “periscope” type because it had very characteristic air inlet on the roof resembling a periscope objective. Such air scoops were already on the 1965 Fiat Abarth OT 1300 'Periscopio' and the 1966 Chaparral 2D, while Formula One adopted these Ram Air Boxes only the early 1970s, with heights limited after the 1975 Formula One season.

The original T33 proved unreliable and uncompetitive in the 1967 World Sportscar Championship season, its best result a 5th at the Nürburgring 1000, co-driven by Zeccoli and Roberto Bussinello.

Alfa Romeo T33/2

Alfa Romeo T33/2 Daytona 2.5L Group 4 Sports Cars 270 bhp @ 9,600 rpm 2462 cc 90° V8 315 bhp @ 8,800 rpm 2.5L – 600 kg

In 1968, Alfa's subsidiary Autodelta developed an evolution model called T33/2. A road version, dubbed Alfa Romeo 33 Stradale, was also introduced. At the 24 Hours of Daytona, the Porsche 907 with 2.2L engines were dominating the overall race, but Alfa took the 2-litre class win, with Udo Schütz and Nino Vaccarella; after that the car was named "Daytona". The win was repeated at the Targa Florio, where Nanni Galli and Ignazio Giunti also took second place overall, followed by teammates Lucien Bianchi and Mario Casoni. Galli and Giunti then won the class at the Nürburgring 1000 km, where the 2462 cc V8 version (named the T33/2 Daytona 2.5 Litre) finished for the first time, fourth place in the 3.0 L class with Schütz and Bianchi. However, in most races, the Alfa drivers were outclassed by their Porsche rivals who used bigger engines. In 1968, the car was used mainly by privateers, winning its class in the 1000km Monza, Targa Florio and Nürburgring races. At the end of season Alfa Romeo had finished third in the 1968 International Championship for Makes.

A total of 28 cars were built during 1968, allowing the 33/2 to be homologated as a Group 4 Sports Car for 1969.

The 2462 cc V8 was also successful in Australian and International open wheel racing. Australian team Alec Mildren Racing, run by Australia's then official Alfa Romeo importer Alec Mildren who used his connections within the Autodelta to obtain the engines, ran the 315 bhp V8 in both his Brabham BT23E and the team's own Mildren Mono. Driver Kevin Bartlett won both the 1968 (Brabham) and 1969 (Mono) Australian Drivers' Championships using the 2.5L Tipo 33 V8 (in 1969 the Alfa V8 actually alternated CAMS Gold Star meetings with an Australian designed and built 2.0L 4 cylinder Waggott engine. The Alfa was used on the power circuits while the smaller Waggott was used on tighter tracks). Bartlett and Formula One driver Frank Gardner also drove the Alfa V8s in the 1968 and 1969 Tasman Series.

Bartlett used the Mildren Mono-Alfa Romeo to win the 1969 Macau Grand Prix run for Formula Libre cars. It was the first Italian engine to win at Macau and as of the 2024 race was the first of three wins for Alfa Romeo engines, the others being in 1988 and 2024.

Alfa Romeo T33/3

Alfa Romeo 33TT3 1969–1972 (T33TT3) Group 5 Sports Cars 420 bhp @ 9,000 rpm (T33/3) 440 bhp @ 9,800 rpm (T33TT3) 6-speed manual

The Alfa Romeo T33/3 made its debut in 1969 at the 12 Hours of Sebring. The engine was enlarged to 2998 cc (183ci) with 400 hp (298 kW), which put the T33/3 in the same class as the Porsche 908 and the Ferrari 312P. The chassis was now a monocoque. The new car did poorly at Sebring and Alfa did not take part in Le Mans after Lucien Bianchi's death in a practice session. The car took a couple of wins in smaller competitions but overall the 1969 season was not a successful one, and Alfa Romeo was placed seventh in the 1969 International Championship for Makes.

In 1970 the bigger 5.0L Porsche 917 and Ferrari 512 dominated, yet Toine Hezemans and Masten Gregory took third overall at Sebring, and Andrea De Adamich and Henri Pescarolo won their class in the 1000km Zeltweg, finishing second overall. Also in 1970, an Alfa T33/3 was one of the "actors" of Steve McQueen's movie Le Mans, released in 1971.[[File:Nanni Galli, Alfa Romeo 33.3, 1971-05-29.jpg|thumb|left|Revised Alfa Romeo T33/3 with [[Nanni Galli]] at the Nürburgring in 1971]]In 1971 the Alfa Romeo racing effort was finally successful. Rolf Stommelen and Nanni Galli won their class at the 1000km Buenos Aires (followed by De Adamich and Pescarolo), before taking another class win (and second overall) at Sebring. De Adamich and Pescarolo later won outright at the 1000km Brands Hatch, a significant result against the "invincible" 917s. They then took a class win at Monza (where Alfa Romeo took the three podium slots in the prototype class) and another one at Spa. At the Targa Florio, Vaccarella and Hezemans won outright, followed by teammates De Adamich and Gijs van Lennep. Hezemans and Vaccarella won their class at Zeltweg, and De Adamich and Ronnie Peterson won overall at Watkins Glen. Alfa Romeo finished the season second place in the championship. In 1972 the 5 litre Group 5 Sports Cars were banned and the 3 litre cars of Alfa Romeo, Ferrari and Matra, redesignated as Group 5 Sports Cars, competed together for outright victories.

Alfa Romeo T33/4

A 4-litre version was entered to 1972 and 1974 CanAm series by Otto Zipper, and the driver was Scooter Patrick. Autodelta was also one of entrants with T33/4 in season 1974. The T33/3 version was also used in the CanAm series earlier.

Alfa Romeo T/33/TT/12

470 bhp @ 11,000 rpm 500 bhp @ 11,500 rpm

The T/33/TT/12 (Telaio Tubolare, tubular chassis) appeared in 1973 with the Carlo Chiti-designed 12 cylinder 3.0L flat engine (500 bhp). The 1973 season was more or less development time and in 1974 the car, which had an F1-style airbox intake added won at Monza 1000 km and finished the season with second place in the championship. It wasn't until 1975 that, after years of trying, Alfa Romeo won the 1975 World Championship for Makes. The season was one of almost total domination with seven wins in eight races., Winning drivers were: Arturo Merzario, Vittorio Brambilla, Jacques Laffite, Henri Pescarolo, Derek Bell and Jochen Mass. For 1976 Autodelta was concentrating on other things and the car was rarely used in competitions.

Alfa Romeo 33SC12

Alfa Romeo 33SC12 Turbo 520 bhp @ 12,000 rpm 2134 cc F12 twin-turbo 640 bhp @ 11,000 rpm

The successor of the 33TT12 1976 was the 33SC12, SC referring to SCatolato, a boxed chassis. The 3.0 L flat-12 engine now produced 520 bhp. With this car Alfa Romeo won the 1977 World Championship for Sports Cars, the 33SC12s driven by Arturo Merzario, Jean-Pierre Jarier and Vittorio Brambilla having won every race in the series. At the Salzburgring the car reached an average speed of 203.82 km/h; in that same race Arturo Merzario also tested a 2134 cc turbocharged SC12 producing 640 bhp finishing second with that car. The SC12 Turbo was Alfa's first twin turbocharged 12 cylinder engine and it was introduced around the same time as Renault's Formula One turbo engine. In the Alfa Romeo engine each bank was fed with its own turbocharger; that feature was adopted by many racecar makers in the following years.

The flat-12 engine was later used on Brabham-Alfa BT45, BT46 and Alfa Romeo 177 F1 cars.

Technical data

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References

References

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