On Wed, 22 Aug 2007 11:18:57 -0400, Gene Kearns
wrote:

An engine is, by definition, either naturally aspirated or not. If it
has a blower (supercharger) or turbocharger it is not naturally
aspirated.

http://en.wikipedia.org/wiki/Naturally-aspirated_engine

That may be true in a strictly technical sense, and true for all gas
engines and 4 stroke diesels, but "naturally aspirated" 2 stroke
Detroit Diesels are commonly understood to be without a turbocharger
since all DDs have a blower just to move air into the cylinders.