Wrong way around - increased pressure increases boiling point, reduced air pressure decreases boiling point. Which is why you can only have a luke warm cup of tea on top of Mt Everest. And which is why the increased pressure of a pressurized cooling system raises the boiling point so you reduce the chance of your cooling system boiling (which is where it loses it's efficiency). However if the liquid in your cooling system doesn't boil (or already has a very high boiling point) than this a moot point - you don't need any pressure to increase the already high boiling temp.
bikeless no longer! welcome home, 2011 KTM 990 Adventure!
syzygy9 screwed with this post 01-22-2013 at 11:05 PM