Wow..... Does that thing run????..... That's exactly what I want to build..... But a 2 stroke instead of a 4 stroke. I might be just dreamin', Here's my math.
21 O.S. buggy engine makes about 2 hp. (donor of sleeves and pistons)
x Multiply by 8 cyls
- subtract supercharger load 25% HP (on the high side)
= 12 HP.
It might be possible to adjust the supercharger outlet pressure to match a custom tuned pipe, to tune for exact fuel/exhaust mixture.
A high mix of nitro would only help things in the power department.
Basically in theory you could raise the intake port timing above the exhaust port and build all the boost you wanted.