title: Allen O-675
text: # Allen O-675
  
  The Allen Aircraft Engine Co. of Compton, a suburb of Los Angeles California, developed an eight-cylinder horizontally opposed aircraft engine during 1928–1929.
  
  Little is known about this engine, other than that it was never given a Type Certificate and that it was not used on any known aircraft.
  
  ## Specifications (O-675)
  
  Data from Aeroengines
  
  ### General characteristics
  
  * Type: 8-cylinder horizontally opposed
  * Bore: 4.75 in
  * Stroke: 4.75 in
  * Displacement: 673.4 ci
  * Dry weight: 575 lb
  
  ### Components
  
  * Cooling system: air-cooled
  * Ignition system: dual ignition
  
  ### Performance
  
  * Power output: 200 hp@1800 rpm
  