gruntguru wrote: ↑17 Jun 2017, 05:42
Anyone have technical details of that engine? How does the supercharging work?
At a guess I would say supercharging from the piston downstroke. Looking at the other side of the engine, some water jacket lines can be seen. I count three inlets and three outlets (the chrome manifold at the top, and the cast manifold at the bottom). There appear to be three extra rectangular ports at the base of the cylinder block. Unless a component has been removed, I see nothing resembling tradition types of superchargers.
Since the intake appears to be a side port valve in the cylinder wall (whatever the term is) some crossflow (upstroke) and compression (downstroke) could occur across the cylinder beneath the piston, between the intake ports & mystery ports on the opposite side. A reed valve or port locations might prevent backflow into the intake manifold.