The Vaxell 100i is a Polish aircraft engine, designed and produced by Vaxell of Bydgoszcz for use in ultralight and homebuilt aircraft.
The Vaxell 100i engine is a four-cylinder four-stroke, horizontally-opposed, displacement, air-cooled, direct-drive, gasoline engine design. It employs dual electronic ignition, electronic, multipoint fuel injection and produces at 3100 rpm.