If you compare pictures of the wright engine and that of any car engine it is obvious that the early Wright engines were 'homemade'
Quote from one of the Smithsonian sites...
The Wrights were only twice charged with having plagiarized others'
work, a somewhat unusual record in view of their successes, and both times
apparently entirely without foundation. A statement was published that
the 1903 flight engine was a reworked Pope Toledo automobile unit, and
it was repeated in an English lecture on the Wright brothers. This was
adequately refuted by McFarland but additionally, it must be noted, there
was no Pope Toledo company or car when the Wright engine was built.
This company, an outgrowth of another which had previously manufactured
one- and two-cylinder automobiles, was formed, or reformed, and a
Pope license arrangement entered into during the year 1903.