I've been out of the flying game for a while, but I previously did some work on a Reno racer glassair cooling system and am now starting to think about an RV-4 and possibly a 2.5L sub (also haven't ruled out wankel) of my own. In order to design an efficient cooling system, it would be helpful to know what temperatures and pressures pilots are seeing in the upper and lower cowl. You would have to be specifically instrumented to take these measurements, but I'm guessing with all of the problems I've read about with sub ffw's, a few have likely done it. I'll take any data, but prefer to know if cooling air temperature is influenced by exhaust heating or radiation and if pressures are taken using a picolo tube. Also would be interested in either lycosour, or water cooled in the typical 2 seat RV HP ranges. ( BTW, if memory serves, the cooling mods took the glassair from 360 to 375 (don't recall if he was indicating kts or miles) indicated all other things being equal.)