In our 360, the hottest cylinder is #3 -- it seems no amount of changes we worked on would improve it much (barring a complete plenum approach).
We use a NACA scoop fed from the pilot side.

Sky2high@aol.com wrote:

In a message dated 5/3/2006 9:05:59 P.M. Central Standard Time, marv@lancaironline.net writes:

  for all of you flying 360---I am having cooling problems---mineral oil is
220
and all CHT are 420 to 465
  I take my oil cooler air off the baffling at #3--I am considering a naca
scope for the oil cooler,closing the 3 inch hole at #3 ---any coments would be
helpful.

Paul,

 

I just noticed that the May issue of EAA's Sport Aviation also has a useful article on cooling.  It is worthwhile reading.

 

Scott Krueger AKA Grayhawk
Lancair N92EX IO320 CS Prop
Slow Build 1989, Flown 1996
Aurora, IL (KARR)

Eschew Obfuscation!