The Peugeot 8Aa, or L112, is a water-cooled V8 aircraft engine that equipped the Voisin VIII bombers and escort fighters built during World War I.

Peugeot responded to the ministry’s request with a design based on their successful racing car engines.

Frequent engine failures lead to the decision, taken in May 1917, to withdraw the Peugeot powered Voisin VIIIs from front line service.

[5] The engine's eight cylinders are in a 90 degree Vee arrangement and are made of cast iron formed in blocks of four with integral water jackets.

[7] A shaft, extending directly back through the Vee of the engine, drives the camshaft spur gear train along with the water pumps, magnetos, tachometer and other accessories.

[3] Production of the engines took place at Peugeot’s Paris workshops located in Issy-les-Moulineaux, Levallois-Perret and La Garenne-Colombes.

In addition to Peugeot's own production, some engines were built under license by other French manufacturers including Darracq.

[13] The Peugeot 8Aa engine suffered from frequent mechanical breakdowns and, as a direct result, by May 1917 the decision was taken to phase out the Voisin VIII.

[3] Small numbers of Peugeot powered Voisin VIII aircraft continued to be built during 1918[14] with the type serving as a trainer till the end of the World War I.

Gabriel Voisin attempted to address these concerns by sourcing Hispano-Suiza 8 engines however this proved impossible as these were already allocated to existing fighter aircraft types.

[11][15] It is notable that the Peugeot 8Aa's replacement in the Voisin bombers was the Renault 12Fe which heated its carburetors via the circulation of jacket water.