[Tempus]

Bigger radiators do not necessarily mean less water back pressure (and lets not confuse the fact that many "bigger" [ie. larger surface area] radiators also are thicker and have more air flow resistance) so bigger is not always better.

Component selection is very important and generalization of "facts" and figures/equations are only useful if most of the parts scale in some easily calculably way. They don't. Most of the time the performance is all over the board in regards to water flow resistance, air resistance, heat transfer capacity, weight, and bling-bling factor (oh and cost but hell cost sucks regardless.)


Also, while you are correct in that the floor temp is the temp of the air going over the rad, you are forgetting that system temps change over time. Systems with larger rads general have a slightly better resistance to minor temp fluctations just from cunductive heat transfer (err I hope thats the one)

Btw, the assumption that doubling the RPM = double airflow (on the same fan) is good on paper but neglects all sorts of air flow issues. Take a micro look at a fan in close proximity to the rad - and more specifically the output air from the rad. My empirical data doesn't support the doubling you seem to be seeing. Have you actually tested this or is it based on the physics of the motor and theoretical performance indexes and not realworld numbers?