I really hate to pop your bubble but a 2 stroke 6-71 detriot diesel isnt actually boosted... meaning that without the blower, the engine wont actually run because it wouldnt move enough air by itself. so in the case of a detriot, its more of an air pump rather than compressing it. the reason that 2 stokes make more power is that there are twice the power strokes. oh and there was no 8-71 either... it was an 8v-71(as in v8. and 8-71 would be inline, but they didnt make one). the 71 means 71 cubic inches per cylinder. I would say you see more 92 series detriots now days anway. Rather than using a roots or screw style, i would say it might be easier just to use a centrugal style supercharger... otherwise you'd have to come up with a manifold. i think your biggest problems would be getting your port area and timing correct. on a detriot the exhaust is run through normal valves and valve train, and only the intake ports are in the cylinder... that might make design a little simpler since you could adjust your camshaft to suit your intake port "timing"
Machinist
84" Giddings & Lewis Vertical Turret Lathe