Posted for Walter Atkinson <walter@advancedpilot.com>:

  **Since we have a steady state situation, same amount of air going out
 that is
  going in, what difference does the volume of the space above the
 cylinders make?**
 
 Well, it may be a steady state, but some of the air going IN the front is
also going OUT the front!  That may be steady, but it's not desirable. What we
want is as much of the air that goes IN to be used to GO WHERE WE WANT IT TO
GO, and go out where we want it to go out.  Having that air be under high
pressure under the cowl is a very desirable thing in that the higher the
pressure, the better the chance that it will go down through the fins to the
area of low pressure below the cylinders.
 
 The perfect world would have no more air go INTO the cowl than is needed for
cooling and have a large area under the cowl to allow this air to slow down
and the pressure to rise so it would go where we want it to go...  and out of
the places we want it to go out of.  That's so easy to say and so hard to
achieve.
 
 Walter