The headquarters was in Genoa while production continued in Turin. During World War I the company produced aero engines such as the 6A. Shortly afterwards, in 1916, both Ceirano and Ansaldi left. In 1923 the company moved to Turin. Severe financial problems lead to a take-over by Fiat in 1925 and the discontinuation of car manufacture in favor of commercial and military vehicles. After World War II they resumed car production, but, in 1947, the company was fully absorbed into Fiat. Cars The first S.P.A.s designed by Alberto Ballacco and Ceirano were the 28/40HP and 60/70 HP which had four cylinder engines, side valves and live rear axles. They were exhibited at the Esposizione di Torino. By 1907 they also produced two six-cylinder models, one of which had the flywheel mounted at the front of the crankshaft. By 1911 they had introduced L-head monobloc engine designs, unitary gearboxes, and High tension magneto ignition systems. The next year they sold 500 cars and introduced a new four cylinder 14/16 hp engine as the basis of their modern, compact car. By 1914 the range included twin, four and six cylinder cars - the biggest had an 11,536cc displacement. After World War I production resumed with the pre-war models; the 14/16 HP using a 2.700cc side-valve engine and the '25/30 HP using a 4,400cc six cylinder engine. In 1922 the highly sophisticated 30/40 Super Sports was launched, with a 4,400cc six cylinder engine, using twin overhead camshafts (dohc) operating four valves per cylinder. The aluminium alloy cylinders had steel liners and aluminium pistons, plus dual carburettors and dual-ignition. The car was also equipped with front-wheel brakes and a V-shaped radiator. By the next year, the sporting range was marketed as Tipo 23, Tipo 24 and Tipo 25. Racing In 1908 Ernesto Ceirano finished third in the Targa Florio driving a four-cylinder, 7,785cc, S.P.A. 28/40 HP. In 1909 an S.P.A. racer driven by Francesco Ciuppa won the Targa Florio race. Completing a single lap of the 148km Grande Circuit in 2 hours 43 minutes 19 seconds at an average speed of 54.67 km/h. Range 28/40 HP 50 HP 60/70 HP 25/30 HP 14/16 HP Tipo 23 Tipo 23 S Tipo 24 Tipo 25 Aero engines During World War I the company also produced aero engines. The S.P.A. 6A was a water-cooled inline six-cylinder engine that produced 220 horsepower (164 kW). The SPA 6A was