> > >>  >>  >>  >>  >  I will need an idiot proof drawing.  Jerry

 > >>  >>  >
 > >>  >>  >>  >OK :-) What are the exact dimensions of your rad core?
 > >>Just the core!
 > >>  >>  >>  >Are you planning on mounting it long ways?
 > >>  >>  >>  >
 > >>  >>  >>  >Paul Lamar

 > >>  >>  >>  13 inches x 18 inches  Mounted long way.   Jerry

 > >>  >>  >OK That means of course you are going to need a space
 > >>  >>  >above the rad core at its leading edge of (235 *.3) /13 or
 > >>  >>  >5.4 inches. Do you have room under the oil pan for that?
 > >>  >>  >
 > >>  >>  >If you mounted it sideways you would only need 235 * .3 /18
 > >>  >>  >or 3.9 inches.
 > >>  >>  >
 > >>  >>  >Still want to mount it long ways?   Paul Lamar

 > >>  >>  If I were starting over I would set the radiator
sideways, however,
 > >>  >>  that is no longer an option.  No, I cannot  achieve the optimum
 > >  > >>  opening at the leading edge of the core.  The maximum
available is
 > >  > >>  4.75 inches.  At the leading edge of the rad header
tank, the plenum
 > >>  >>  opening is 5.188 inches.   May not be optimum but it is very good.
 > >>  >>  I suspect that a MUCH smaller opening will prove to be adequate as
 > >>  >  > long as a good pressure drop through the radiator is
achieved.  If
 > >>  >  > the louvers are efficient, no problem.  If they are not, then no
 > >>  >  > intake plenum regardless of size or shape will make a damn bit of
 > >>  >>  difference.  Just an uneducated opinion, mind ya.    Can
the test box
 > >>  >>  be made so that different size intakes can be tried?
 > >>  >>
 > >>  >>  Jerry

 > >>  >OK we will build the box with 4.75" by 13" opening and see
 > >>  >what we get in the way of airflow. There may be a way of cheating
 > >>  >when you do an actual 3D duct.
 > >>  >
 > >>  >Drawing later.
 > >>  >
 > >>  >
 > >>  >Paul Lamar

 >   For the test, what do  you think of a variable inlet opening , from
 > 3 inches to 6 inches ?  Like a reverse cowl flap.     Jerry

 If you are willing to build it I am willing to test it.

 Paul Lamar

Here is the drawing Jerry. Made from 3/4 ply and dry wall screwed
together. Put 3/4 half round trim all all openings to smooth
the air intake.

Paul Lamar

O.K.  I will do that.   I have a lycoming engine mount to build and
some other loose ends to wrap up before I can begin.   Looks like
early DEC.    Hope that is o.k.    Jerry

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