It also seems to have pure Schneurle porting, i.e. two angled ports on either side of the exhaust port, without the customary boost port, unless, that is, it is machined, or cast internally.
Most current engines (not the OS.40LA) labeled as Schneurle do have this extra port, but it was not a part of Mr. Schneurle's original design, back then.


Mark,


Looking in through the exhaust port, is there a boost induction port on the other side of the cylinder?