Very nice plane sjn hope it goes well and thanks pe,earl etc for going some way to explain the method for measuring heat on your engine.I'm more in dubs camp or way of thinking as i used to worry about the engine temps quite a lot.Now i put a lot of thought into venting the cowl well and just directing the small inlet hole directly onto the cylinder with a cowled engine,run it rich and go from there.They soon let you know how it's all going