The ALFA 20/30 HP was almost identical to the 24 HP of 1910 and could be called HP 24 Series E. The engine was same as used in 24 HP but now the camshaft with side chain, to reduce noise.
At the outbreak of World War I, August 3, 1914, Italy declared itself neutral and ALFA plants have not been directly affected by war or by manufacturing related to the war effort.