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Stu,

It's too bad Jim and I weren't building our Lancairs at the same time.  I also had oil cooler problems and, after much experimentation with plenums, external air exits and scoops, I also found the solution was to completely smooth and route the air flow into the NACA scoop exit.  Although I have an IO 320, I use the smaller 7-vane cooler mounted on the firewall and simply dump the cooler exit air into the lower cowling along with the engine cooling exit air.  I have had to install a pilot controlled air shut-off door on the entry to the cooler plenum to keep the oil temps up during flights in cool air even though the NACA is located 4 inches below the cowl split on the undesireable left side.

Scott Krueger
LNC2 N92EX

LML website:   http://www.olsusa.com/mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.