I think if I were attacking the problem, I'd go with the system you found that cools the cylinders and then work on the oil temp problem. Some type of oil cooler(s) with blast tubes for forced air. Maybe a scoop on the side of the cowl with a hose directly to a bonnet on the oil cooler. It could be closed when not needed. That, with fins on the oil cooler as one post suggested, might fix the problem. Remember, the cowl outlet opening is as important as the inlet. I think Langford had a recent post with maybe a link to his web page on the mechanics of checking cooling air differential.
Good luck........ Larry Flesner
