Peugeot 8Aa

The Peugeot 8Aa, also called the L112, is a water-cooled 90 degree V8 aircraft engine that powered the Voisin VIII bombers and escort fighters of the First World War. It was designed by Ernest Henry from Peugeot racing car engines to answer a 1915 French requirement for 200 horsepower engines able to fly long distances at about 4,400 m. It was advanced for its day, with double overhead camshafts, four valves per cylinder, twin spark plugs and a dry sump, and it displaced 11.33 litres and gave 230 hp at 2000 rpm. It was unusually fuel efficient, with a thermal efficiency above 30 percent, but poor reliability led to the Voisin VIII being withdrawn from front line service in 1917. A total of 1,054 had been built by the end of 1917.