You'll want to read through the following link on Lindberg's PT-109 for several recommendations on where to place your pickup. The post is long - 10 pages - but you'll find a lot of good advice & photos from many who have gone the route of watercooling their motors. One even went as far & installed a cooling pump on his boat.

http://forums.radiocontrolzone.com/s...9&page=1&pp=25