Originally Posted by
churchy
FinBenton: on bottom rad you should close rad with something no places without fans, otherwise you loose more efficiency even then 1/3rd of rad (air pushed with bottom push fans goes least resistance way - wrom fanless side, and same storry about top pull fans, they partially suck air from least resistance way - from fanless side). If not close that area, then you can think of cutting case back more, to not let just inlets par to rad be outside case, but 3rd pair of fans aswell. It's hard to see what rads you used and if there is lot of empty space between heater core and rad shroud. If there is lot of empty space like in eg. SR1 rads, problem described above makes rad performance drops very serious.