title: Sulzer ZG9
text: # Sulzer ZG9
  
  Sulzer ZG9 was a pre-World War II opposed-piston two-stroke diesel engine by Sulzer. The engine was available with a choice of two, three and four cylinders (2ZG9, 3ZG9, 4ZG9); the two-cylinder version developed 120 bhp. It used a piston scavenge pump. This was mounted vertically above one rocker, driven by a bellcrank from the main rockers. This engine is sometimes cited as an inspiration for the Commer TS3 design.
  
  ## Specification
  
  Data from
  
  ### General characteristics
  
  * Type: Two cylinders, four opposed pistons.
  * Bore: 90 mm
  * Stroke: 120 mm
  
  ### Performance
  
  * Power output: 50 PSe / 36,77 kW at 1,500 rpm
  