COOLING
My cooling intakes are approximately 14 sq inches on each side. Each intake feeds its own plenum.
The Cylinders are fairly well sealed against leaks.
CHTs are all within 25 deg of each other. With 90 deg OAT, I'm seeing 400-425 CHT on a high power, low speed, climb.
At full power cruise, CHTs are hanging between 350 - 375.
My intakes are a little to large, 10 - 12 inches would probably be OK. Latter, if I feel like it, I may make some temporary lips that I can tape to the intakes to close them down a little, but not now
COMBUSTION AIR
I'm currently getting my combustion air from inside the lower cowl (hot area). This could easily rob me of 10-15 hp
When I built my cowl, I installed small (5 sq inches) armpit scoops on each side of the cowl. The left scoop is ducted and plumbed for the Oil Cooler. The right scoop is meant to be used for unfiltered combustion air.
This weekend I'll build the ducting to route the air from the scoop, down the side and bottom of the cowl, then into a small plenium box where the air needs to turn 180 degrees then enter into the engine air intake.
Waiter