I have a half VW I built for my ultralight, it has 82mm stroker and 94mm cylinders and a single Mikuni 34mm carb. I am selling the half VW and replacing it with my experimental supercharged V-Twin. The V-Twin is a Honda clone engine and the supercharger is an AMR300 from a small European car. I have a v belt drive pulley on a stub shaft on the flywheel and a prop hub on the power shaft. I expect 35+hp with the supercharger.
The same supercharger could be adapted to a half VW with stock bore and stroke to get similar hp. The supercharger weighs 7 lbs.
I am willing to sell the half VW or the supercharged V-Twin for $2000. However if I sell the V-Twin I will immediately build another one. The Honda clone engine is all stock except a custom ignition and the supercharger with a 34mm Mikuni carb.
I have not yet tried a supercharger on a half VW but I like the idea of a stock long block converted to 2 cylinders and supercharger attached. I have even heard of a prop hub with a v belt pulley that could be used to turn the supercharger.
Norm Heistand still testing the half VW and the clone Vtwin..