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      • The 2si 215 is a family of single-cylinder, fan-cooled, two-stroke, single ignition, aircraft engines that were designed for ultralight aircraft.
      The basic engine was originally designed and produced by JLO-Motorenwerke of Germany and was later acquired by the AMW Cuyuna Engine Company of Beaufort, South Carolina and marketed under the Cuyuna brand name. Later the engine was marketed by Cuyuna under the Two Stroke International (2si) brand. Cuyuna no longer markets engines for aircraft use although the 215 is still in production as an industrial and multi-fuel engine.


      Development


      The 215 is a conventional single-cylinder engine that weighs 39 lb (18 kg) in its 215R aircraft version. The engine features single breaker and points ignition, with single capacitor discharge ignition used on the current models. It also incorporates piston porting, tuned exhaust system, single carburetor, fan cooling, fuel pump, a cast iron cylinder liner, ball, needle and roller bearings throughout. The 215R aircraft version was offered with an optional belt reduction system and the modern industrial versions have an optional gearbox with ratios of 2.04, 2.65 and 3.06. Starting is a recoil starter with a custom electric starter available as an option.


      Variants


      215D
      Gasoline aircraft engine with direct drive. Single carburetor, 20 hp (15 kW) at 6000 rpm, weight 42 lb (19 kg), out of production.
      215F
      Gasoline industrial engine. Single carburetor, 20 hp (15 kW) at 6000 rpm, still in production.
      215MF
      Multi-fuel industrial engine. Single carburetor, 7 to 12 hp (5 to 9 kW) at 6500 rpm, weight 53 lb (24 kg), still in production.
      215R
      Gasoline aircraft engine with belt reduction drive. single carburetor, 20 hp (15 kW) at 6000 rpm, weight 39 lb (18 kg), out of production.


      Applications




      Specifications (215D aircraft engine)


      Data from Cuyuna & 2si


      = General characteristics

      =
      Type: Single-cylinder, two-stroke aircraft engine
      Bore: 2.658 in (67.5 mm)
      Stroke: 2.362 in (60.0 mm)
      Displacement: 214 cc (13.06 cu in)
      Length: 11.75 in (298.4 mm)
      Width: 7.0 in (177.8 mm)
      Height: 14.0 in (355.6 mm)
      Dry weight: 42 lb (19 kg)


      = Components

      =
      Valvetrain: piston porting
      Fuel type: Regular auto fuel
      Oil system: premixed oil and fuel at 50:1
      Cooling system: fan cooled
      Reduction gear: optional belt reduction


      = Performance

      =
      Power output: 20 hp (15 kW) at 6000 rpm
      Compression ratio: 12.5:1


      See also


      List of aircraft engines
      Hirth F33
      KFM 107
      Rotax 277


      References

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    2si 215