Ed Anderson wrote:

Yes, I thought it provided some good information that I had not seen anyplace else about bell mouths - didn't realize there was so much to them. But, I guess on the racing side 1.5HP can make that 1/1000 of a second difference in winning.

Ed

Ed,

   Unlike Lynn, it's been a very long time since I've raced.  However,
there can be a lot of things in a car that eat up horsepower, e.g
the components in the drive line.  I remember reading an article in
the late sixties the indicated that a car with a 140 hp engine might
only be delivering 35 hp to the wheels.  In that case, an increase of
1.5 hp would represent a 5% increase in NET horsepower to the
wheels.

   In our application, there is less attenuation, but a 1.5 hp increase -
for just changing a contour in the inlet - is almost "free" power..

YMMV,
Dale R.