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2si 215
Cuyuna 215R

The 215 is a conventional single-cylinder two-stroke 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 carburettor, 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.

The basic engine was originally designed and produced by JLO 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 was still in production as an industrial and multi-fuel engine.

215D - Gasoline aircraft engine with direct drive. Single carburetor, 20 hp (15 kW) at 6000 rpm, weight 42 lb (19 kg).
215R - Gasoline aircraft engine with belt reduction drive. Single carburetor, 20 hp (15 kW) at 6000 rpm, weight 39 lb (18 kg).


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 (298.5 mm)
Width: 7.0 in (177.8 mm)
Height: 14.0 in (355.6 mm)
Dry weight: 42 lb (19 kg)
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
Power output: 20 hp (15 kW) at 6000 rpm
Compression ratio: 12.5:1


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