versus . The racing-prepared engine was fitted with two carburettors and had a 5.50:1 compression ratio. It produced ; after the war, for the 1920–22 races, it was brought to . Top speed was . The final drive ratio was 18/49 instead of the standard 17/49. The Sankey steel wheels were replaced by 6.0x20" knock-off wire wheels. Fuel tank capacity was expanded from the standard to . References Notes Bibliography External links ALFA 40-60 HP Castagna Siluro Aerodinamica 1914 on autoconcept-reviews.com 40 60 HP Cars introduced in 1913 1920s cars