title: Sauer S 2400 UL
text: # Sauer S 2400 UL
  
  The Sauer S 2400 UL is a 4 stroke aircraft engine for homebuilt and ultralight aircraft.
  
  ## Design and development
  
  The engine is based on the Volkswagen air-cooled engine or the Wasserboxer. It is extensively modified for aircraft use and all the parts are custom made. The engine is derived from the certified engines produced by the same manufacturer and used in several motorgliders and small aircraft.
  
  The engine can be delivered with aluminium or magnesium casing (Wasserboxer-casing or the casing from the beetle engine), where the aluminium casing weighs 7 kg more.
  
  ## Applications
  
  * Groppo Trial
  
  ## Specifications (variant)
  
  ### General characteristics
  
  * Bore: 94mm
  * Stroke: 84mm
  * Displacement: 2332cc
  * Dry weight: 68 or 75 kg depending on casing
  
  ### Components
  
  * Valvetrain: Single overhead exhaust valve, single overhead inlet valve per cylinder
  * Fuel system: Bing carburetor with altitude compensation
  * Fuel type: min 95/98 RON
  * Cooling system: Air-cooled
  
  ### Performance
  
  * Power output: 100hp at 3500 rpm
  * Compression ratio: 7.9:1
  