Wolseley Viper

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Rear view of preserved Wolseley Viper
Type Piston inline aero-engine
Manufacturer Wolseley Motors
First run 1918
Major applications Royal Aircraft Factory S.E.5

The Wolseley Viper is a British-built, high-compression derivative of the Hispano Suiza HS-8 liquid-cooled V-8 engine, built under licence by Wolseley Motors during World War I.

It powered later models of the S.E.5a, SPAD VII and other British or British-built aircraft designed for the Hispano-Suiza.


Wolseley W.4A Python I
Wolseley W.4A Python II
Wolseley W.4A Viper
Wolseley W.4B Adder I
Wolseley W.4B Adder II
Wolseley W.4B Adder III
Wolseley W.4A Python



The Wolseley Viper powered Royal Aircraft Factory S.E.5a that is owned and operated by the Shuttleworth Collection remains airworthy and can be seen flying at home displays throughout the summer months.[1]

Engines on display[edit]

Specifications (W.4A Viper)[edit]

Data from Lumsden[2]

General characteristics

  • Type: 8-cylinder, upright, 90 degree Vee engine
  • Bore: 4.72 in (120 mm)
  • Stroke: 5.12 in (130 mm)
  • Displacement: 716.8 cu in (11.77 L)
  • Dry weight: 500 lb


  • Fuel system: Twin Zenith-Duplex carburettors
  • Cooling system: Liquid-cooled
  • Reduction gear: Direct drive, Right-hand tractor


See also[edit]

Related development
Comparable engines
Related lists



  1. ^ Shuttleworth Collection S.E.5A www.shuttleworth.org Retrieved: 24 September 2009
  2. ^ Lumsden 2003, p. 232.


  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.