All,
I am looking for suggestions on how to lower my oil temps. I am running an IO 320 on the original 235 frame. On warm days in a climb I have trouble keeping them below 220. I usually have to flatten out the climb to cool things down if they get up to 230 or so. Once in cruise it is not a problem and they will settle around 210. I would like to get them down to 190 if possible. The problem is on a 75 plus degree day when the airplane is already warm from flying and I need to go again. I am picking up outside air on a naca vent on the left side of the cowl. There is a 6" length scat tube (4"diameter) connecting the cowl inlet to a glass expansion section that is connected to the cooler.(see pics). It just dumps in the lower cowl area.
I am running a Stewart Warner oil cooler that many have had success with.

I have tried larger hoses to the cooler now using -8's and also removed the 90 deg fittings I used to have to improve flow.
I suspect my ducting and or connection to the cooler could be improved. I am looking for suggestions that could be done without cutting the cowl.

Thanks in advance!

Randy L.Snarr