 Alongside the 24 HP in 1911 Alfa introduced the 12 HP, somewhat simpler in its construction and equipped with a smaller 2,413 cc engine, later evolved into the 15 HP and then into the 15-20 HP.On 14 May 1911 the 24 HP made its racing debut at the 6th Targa Florio.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 .