[6][7] A pair of special 24 HP tipo corsa (racing type) were built for the occasion, with 2-seat baquet bodywork, an additional 30-litre fuel tank behind the seats, two spare tyres, and an engine tuned to 45 bhp (34 kW) at 2,400 rpm.

[9] Both drivers (Nino Franchini and Ugo Ronzoni) had to retire on the third and last lap of the course—the first because of an accident, the second because of physical exhaustion.

The in-block camshaft was now chain- instead of gear-driven, the engine produced 49 bhp (37 kW) at 2,400 rpm, and top speed was 115 km/h (71 mph).

[1] Although Italy initially remained neutral until 1915, with the outbreak of First World War in 1914 international demand for motor cars declined sharply.

As Alfa Romeo turned to wartime production, in 1915 frames and parts for almost 100 20-30 HP cars were set aside unused.

Its engine was a 4,084 cc or 249.2 cu in (bore and stroke 100 x 130 mm, compression ratio 4.15:1) sidevalve inline-four cylinder, fed by a single vertical carburettor.

The driveline comprised a dry multi-plate clutch, a four-speed gearbox and a one-piece propeller shaft, spinning inside a tube attached to the rear differential housing.