Ed: I am planning on similar HP for my Super charged 3 rotor Questair Venture Project with a Rotrex Supercharger. I have a cooling system worked out that (hopefully) will over cool this engine/oil/ PSRU/Intercooler initially. I think it will be easier and safer to try get rid of cooling and warm the engine up then chance over heating it. What good is HP you cannot cool enough to use. This seems to be the problem with most of these designs. And for that matter Homebuilts in general. I built a Lancair 360 many years back that had overheating problems that I finally decided to get it cooled to the point of using WOT anytime for as long asI wanted to throw 100 dollar out the tailpipes. It worked with the help of some plenum magic I learned from people much smarter than me.