I beg to differ the Wrights did indeed design their own engine Mr Taylor worked for the Wrights and did work on the engine and it was not an automotive engine it was designed for the Wright Flyer, and yes iwas inline but laid flat or a flat 4 and used an evaporator vs a carburetor.
http://nasm.si.edu/wrightbrothers/fly/1903/engine.cfm
http://wright.nasa.gov/airplane/eng03.html