The MWfly B22 is a family of Italian aircraft engines, designed and produced by MWfly of Passirana di Rho for use in light aircraft.^[1]

The B22 series are all four-cylinder four-stroke, horizontally-opposed, 2,203 cc (134.4 cu in) displacement, liquid-cooled, gasoline engine designs. They all employ single electronic ignition systems and have a compression ratio of 10.4:1.^[1]

B22D

Direct drive model with an output of 95 hp (71 kW) at 3300 rpm^[1] or 100 hp (75 kW) at 3500 rpm, or 135 hp (101 kW) at 4700 rpm.^[2]

B22G

Geared model with a mechanical gearbox reduction drive with a reduction ratio of 1.731:1 or 1.958:1 and an output of 122 hp (91 kW) at 4000 rpm, or 135 hp (101 kW) at 4700 rpm, respectively.^[2]

B22L

Model with a mechanical gearbox reduction drive with a reduction ratio of 1.73:1 and an output of 115 hp (86 kW) at 3950 rpm. By March 2018 the engine was no longer advertised on the company website and seems to be out of production.^[1][2]

B22R

Model with a mechanical gearbox reduction drive with a reduction ratio of 2.14:1 and an output of 130 hp (97 kW) at 4700 rpm. By March 2018 the engine was no longer advertised on the company website and seems to be out of production.^[1][2]

Data from Tacke^[1]

• Type: Four cylinder, four stroke aircraft engine
• Bore: 93 mm (3.7 in)
• Stroke: 81 mm (3.2 in)
• Displacement: 2,203 cc (134.4 cu in)
• Length: 629 mm (24.8 in)
• Width: 758 mm (29.8 in)
• Height: 427 mm (16.8 in)
• Dry weight: 75 kg (165.3 lb)

• Fuel type: gasoline
• Cooling system: liquid
• Reduction gear: none

• Power output: 95 hp (71 kW)
• Compression ratio: 10.4:1

Related lists

• List of aircraft engines

• Official website