Alfa Romeo Tipo 33
The Alfa Romeo Tipo 33 was Autodelta’s decade-long project to return Alfa Romeo to the summit of international sports prototype racing — initiated in the early 1960s by Carlo Chiti as a systematic attempt to rebuild the marque’s motorsport reputation following its withdrawal from top-level competition after the 1951 Formula One season. The first chassis was built in 1965 at Autodelta; the project drew directly on Chiti’s experience from Ferrari’s 1961 shark-nose F1 programme before his stormy departure from Maranello.
The Tipo 33 mid-engined prototype made its racing debut on 12 March 1967 at the Belgian hillclimbing event at Fléron — a gentle introduction, won by Teodoro Zeccoli. The base engine was a 1,995 cc 90° V8 producing 270 hp at 9,600 rpm, with twin overhead cams, dry-sump lubrication, and Lucas mechanical fuel injection in a large-diameter tube frame. The first version was nicknamed “periscope” for its distinctive vertical air inlet. The 1967 World Sportscar Championship season proved punishing: unreliability was persistent, the best result a 5th place at the Nürburgring 1000 km.
Autodelta developed the car methodically through the late 1960s and early 1970s: the 33/2 (1968), the 33/3 (1971, 3.0L V8), the 33TT3 (1972, tubular chassis) — in which Helmut Marko set the all-time Targa Florio lap record in 1972. The breakthrough came with the 33TT12 (1973): Chiti’s horizontally-opposed 12-cylinder 3.0-litre engine producing approximately 500 bhp, mounted in a tubular space frame. After two seasons of refinement, the 33TT12 delivered: Alfa Romeo won the 1975 World Championship for Makes, with chassis 008 alone winning four of the nine championship rounds, claiming a 100% finishing record and placing no lower than second all season. Chassis 008 then won the 1975 Targa Florio — the last great Alfa victory at the Sicilian mountain race.
For 1977, Autodelta fielded the 33SC12 — “SCatolato” (boxed chassis), a stressed-skin tub replacing the tube frame, with the flat-12 now producing 520 bhp. The result was one of the most complete season-sweeps in sports car racing history: driven by Arturo Merzario, Jean-Pierre Jarier, and Vittorio Brambilla, the 33SC12s won every race in the 1977 World Championship for Sports Cars — all eight rounds — giving Alfa Romeo its second and final championship of the Tipo 33 era.
A small number of road cars were derived from the Tipo 33 project in 1967: the Alfa Romeo 33 Stradale, bodied by Franco Scaglione, with 18 examples built. It is universally regarded as one of the most beautiful automobiles ever created. The Tipo 33 racing programme concluded in 1977 as the sports prototype category was dissolved; it stands as the most successful racing programme in Alfa Romeo’s post-war history.
Connections
- Autodelta — primary_racing_programme, 1967–1977, source: wikipedia.org
- Carlo Chiti — designed and directed, source: wikipedia.org
- Targa Florio — won 1971, 1975; Marko lap record 1972, source: wikipedia.org
- Alfa Romeo — manufacturer and title holder (1975, 1977), source: wikipedia.org