1) Several pictures of the right
side of the engine compartment show a control knob attached top the
upper engine mount. What's that for?    2) Your instrument panel picture
shows an air vent at the bottom of the panel and another on the NACA
duct plenum against the right fuselage wall. Where does the air come
from for the panel mounted vent?    3) Some time ago you mentioned
cutting off the baffling deflector in front of #2 cylinder. I was hoping
one of your pictures would show this, but no such luck. Did your
modification include both the cylinder barrel and head, or only the
head? And did you cut off all of the deflector or leave a little for old
time's sake?

Charles,

 

1.  Do you mean the pull knob obscuring the oil filter?  If so, it is connected to the old Cessna gascolator lower down in the pic to back flush its' fuel filter out the little tubing exiting the bottom of the pic.  The knob is accessible thru the oil door and is pulled whenever the oil is checked.

 

 

2. Both the left and right naca has an eyeball vent mounted directly to the naca plenum.  Each plenum also has a 3/4 inch tube exiting the top and is SCAT hose connected to the vents at the bottom center of the panel.  Furthermore, the right plenum has an additional 1/2 inch tube out the plenum top that feeds cooling air to the Garmin 430 in the stack.  I get enough air out of all the vents to be chasing charts and plates all over the cockpit!  You can see the avionics cooling tube as it passes fwd of the dimmers, aft of the header tank vent line, thru a 45 fitting and into the back of the 430:

 

 

3.  Well, this is the best angle I've got.  I did not alter the area around the lower cyl fins because most of the heat is generated in the top "stroke" area of the cyl.  Yes, the lip (upward deflector) is completely cut off and the bottom cylinder wrap was moved fwd a wee bit (elongated screw holes) for more air.  What spans the cyl fins is a deflector with about a 1/2 inch opening above the baffle deck to try to deflect air down the front of the cyl.  Right now, cyl 4 is the hottest followed by cyl 3.