"Steve" wrote

I believe that if you look at modern diesels currently being produced
and sold, you'll find virtually NONE rated at more than 50-60 horsepower
that are not turbo-supercharged. And equally few that are strictly
mechanically blown (the Detroit Diesel 2-strokes are no longer in
production). The VAST majority are, indeed, turbo-supercharged.

Not true of some of our school busses that were produced in the past 5 or so
years. They make up for the lack of super or turbocharging with more cubic
inches.
--
Jim in NC