I'm not all that suspicious as the principal is sound. Laminar flow is great for low flow resistance, but it is not the best for heat transfer. Adding turbulence puts more water molecules in contact with the metal of the radiator as it flows though, aiding in heat transfer. Using a bigger radiator works essentially the same way, though it does it with more surface area rather than shuffling more water up against the existing surface area.

And I would like to see Jim's info, but please, if anybody (not picking on you Wayne, I mean anyone <img src="/forums/images/graemlins/wink.gif" alt="" />) wants to argue radiator theory, start a new thread for it???

--Dan