the thing that calver was saying about was the 4 core rads that many people think are the best, which isn't the case. because your essentially doubling the thickness of the rad, and people don't change the fan for something more substantial. so the cooling capacity is cut down by 50% because there isn't anymore fan power than standard to push the air out so it struggles to cool efficiently.
and why would a smaller volume of water be more effective at cooling exactly? unless the original design of the cores were change...however if they were exactly the same of course a 4 core would be more efficient at cooling, its thermodynamics...and logic, if the cores are smaller theres more water in contact with the sides allowing passing air by and take the heat energy. doesnt neccesarily have to have a larger volume of water just core dimensions to change.
iv never had problems with my 4 core, the only time iv seen my gauge actualy reach over mid way on my TIM gauge was around coombe after i finished trying to kill it at mini world action day
for a standard engine, i would assume alot of people in this thread have a fairly low spec engine absolutly no need for an alloy rad' there is such thing as over cooling you know, i was told in uni apparently as standard a mini is one of the most thermaly efficient, though im not sure thats quite true lol
