title: Sauer S 2100 ULT
text: # Sauer S 2100 ULT
  
  The Sauer S 2100 ULT is a turbocharged four-stroke aircraft engine for homebuilt and ultralight aircraft.
  
  ## Design and development
  
  The engine is based on 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 light aircraft.
  
  ## Operational history
  
  At least one Asso X is reported to be using this engine.
  
  ## Applications
  
  * Asso X Jewel
  
  ## Specifications (variant)
  
  ### General characteristics
  
  * Bore: 90.5mm
  * Stroke: 84mm
  * Displacement: 2161cc
  * Dry weight: 76 kg
  
  ### Components
  
  * Valvetrain: Single overhead exhaust valve, single overhead inlet valve per cylinder
  * Turbocharger: Low Boost
  * Fuel system: Bing carburetor with altitude compensation
  * Fuel type: min 98 RON
  * Cooling system: Air-cooled
  
  ### Performance
  
  * Power output: 110hp at 3000 rpm
  * Compression ratio: 6.5:1
  