It powered later models of the
S.E.5a,
SPAD VII and other British or British-built aircraft designed for the Hispano-Suiza.
Variants
Wolseley W.4A Python I (1917)
150 hp (110 kW) – licence produced version of the
Hispano-Suiza 8Aa with minor structural changes and the weight increased to 455 lb (206 kg), retained the original's low compression 1.8 in (45 mm) pistons and compression ratio of 4.7:1. Only 100 built.[1][2]
Wolseley W.4A Python II
180 hp (130 kW) – high compression version of the Python I with high compression 2 in (50 mm) pistons and compression ratio increased to 5.3:1.[2]
Wolseley W.4A* Viper (1918)
200 hp (150 kW) – broadly the equivalent of the Hispano-Suiza 8Ab, compression ratio of 5.3:1 (19 early production engines had a higher compression ratio of 5.6:1), with 200 hp English Hispano propeller hubs.[3]
Wolseley W.4B Adder I (1918)
200 hp (150 kW) – modified version of the Hispano-Suiza 8B.[3][4]
Wolseley W.4B* Adder II
200 hp (150 kW) – modified and improved version of the Adder I.[3]
Wolseley W.4B* Adder III
200 hp (150 kW) – modified and improved version of the Adder II with balanced crankshaft.[3]