PL wrote  (snip)

 >  Pressure drop> across the butterfly is a subject I am intensely
interested in >  as it has a direct bearing on the amount of HP being
generated.

There is something I don't understand here-in a NA engine, isn't that the
difference between manifold pressure and atmospheric?

Bob Darrah

Yes.  If atmospheric is 29 inches of Hg and manifold is 28 inches of Hg then;

HP = 28/29 X HPmax

All other things being equal.

Paul Lamar
 
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