In a RTR boat like for example a Miss Vegas with the engine completely covered by a cowl running a engine like this will definitely heat it and I would imagine destroy it. I have a .12 car engine and I went through a little heat cycle breaking in, It doesn't take very long to get an engine over 220 degrees (less than 1 minute). I am just guessing here but I would guess that you will easy hit 400 degrees with no water or air cooling, I would think that temps of this nature wouldn't be helpful in anyway. Just for the record I am a newbie and these are just my opinions, its your engines if you want to run a water cooled engine dry (more power to you).


Paul


I also couldn't find anything that said run a water cooled engine dry.