1955 Alfa Romeo 750 Competizione
In Marcello Minerbi’s book Alfa Romeo-Zagato SZ TZ, Giuseppe Busso talks about how the 750 Competizione came about: “This concept first developed through collaboration between Alfa Romeo and Abarth-Boano on a box-type sheet metal chassis conceived by Abarth. The car was built as a roadster and tested, but due to technical problems which came to light during the tests, Alfa gradually lost interest in it.”
Initially, the idea was to produce 50 cars, but as Busso points out technical problems haulted further development.
The car was powered by a long stroke Inline-4 that wasn’t too far off Alfa’s pre-war designs.
Eventually Alfa Romeo did produce the SZ as a purpose-built racecar, but this used a completely different philosophy, having Giulietta components in a tube-frame chassis.
1955 Alfa Romeo 750 Competizione Gallery
See full 1955 Alfa Romeo 750 Competizione Gallery here
In Detail
| submitted by | Richard Owen |
| engine | Light Alloy Inline-4 |
| position | Front Longitudinal |
| valvetrain | DOHC, |
| fuel feed | Twin Horizontal Twin-Body Carburettors |
| displacement | 1488 cc / 90.8 in³ |
| bore | 78 mm / 3.07 in |
| stroke | 82 mm / 3.23 in |
| compression | 10.0:1 |
| power | 108.1 kw / 145 bhp @ 8000 rpm |
| specific output | 97.45 bhp per litre |
| bhp/weight | 210.14 bhp per tonne |
| body / frame | Aluminum Body over Abarth-Developed Boxed-Steel Chassis |
| driven wheels | RWD |
| front tires | 5.0 x 15 |
| rear tires | 5.0 x 15 |
| front brakes | Drums |
| rear brakes | Drums |
| steering | Rack & Pinion |
| f suspension | Transverse Arms w/Coil Springs, Coil Springs, Telescopic Dampers |
| r suspension | Solid Axle w/Longitudinal Arms, Coil Springs, Telescopic Dampers |
| curb weight | 690 kg / 1521 lbs |
| wheelbase | 2120 mm / 83.5 in |
| front track | 1220 mm / 48.0 in |
| rear track | 1240 mm / 48.8 in |
| length | 3470 mm / 136.6 in |
| transmission | 5-Speed Manual |
| final drive | 4.54:1 |
| top speed | ~220 kph / 136.7 mph |
