Originally Posted by
barit1
Although some literature describes this as a single, the video makes it obvious it's a tandem twin.
I guess that would depend on how exactly one defines "engine". Is a "U" engine or an "H" engine one engine or two engines geared together? Is the Deltic engine one engine or 3? In some ways the Fiat AS 6 is two engines, in others it's not Physically, both halves shared the same crankcase casting, and they operated off the same supercharger and induction manifold. The Supercharger was driven off the crankshaft of the rear half, so without the rear half producing power, the front half would only run at reduced power or perhaps not at all, from the video it's apparent that the rear half was started first.