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 byRichard Owen
engineLight Alloy Inline-4
positionFront Longitudinal
fuel feedTwin Horizontal Twin-Body Carburettors
displacement1488 cc / 90.8 in³
bore78 mm / 3.07 in
stroke82 mm / 3.23 in
power108.1 kw / 145 bhp @ 8000 rpm
specific output97.45 bhp per litre
bhp/weight210.14 bhp per tonne
body / frameAluminum Body over Abarth-Developed Boxed-Steel Chassis
driven wheelsRWD
front tires5.0 x 15
rear tires5.0 x 15
front brakesDrums
rear brakesDrums
steeringRack & Pinion
f suspensionTransverse Arms w/Coil Springs, Coil Springs, Telescopic Dampers
r suspensionSolid Axle w/Longitudinal Arms, Coil Springs, Telescopic Dampers
curb weight690 kg / 1521 lbs
wheelbase2120 mm / 83.5 in
front track1220 mm / 48.0 in
rear track1240 mm / 48.8 in
length3470 mm / 136.6 in
transmission5-Speed Manual
final drive4.54:1
top speed~220 kph / 136.7 mph