Just curious but if the alignment of the cylinders defines whether an engine is longitudinal or transverse then conversely a V4 engine is not a V4 but a "square" engine (in fact there is a bike known as the Ariel 'square four' ). I am hoping to see Laverda's rectangular 6 in California this year, as well as Honda's MotoGP pentagon racer.
(Forgive me Al, but I had to say something!)