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