gofer
Moderator
- 8,165
- 1,549
- Feb 18, 2006
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South Gilbert,
Arizona
It does effect the overall efficiency of the radiator, or intercooler in this case, to cool the charge of air passing through it by adding paint. The fins are designed in a way so that they dissipate the heat and when covered by spray paint, if its thick enough, they won't be as efficient. Sulfuric anodizing leaves a 25 micron (0.000984251969 inches) protective coating on the intercooler and actually increases its ability to dissipate heat.why is every stock radiator in the world black? wouldnt black paint increase water temp? "no" it makes NO differance on a intercooler either
Keeping a consistent spray paint coat thickness is damn near impossible and depending on the type you use could also determine how thick each coat ends up. You'll also find that the paint covering the fins actually holds the heat in which is exactly the opposite of what you want, at least the intercoolers black though.
If your going to pay $400 to $1500 on a FMIC why in the hell would you go buy a can of Krylon and rattle can it? Anodizing protects it, allows it to cool better, and will last the life of the intercooler and you can still make it whatever color you wish. It would be hard to prove either theory without some hardcore lab testing because of all the factors that come into play so I guess neither is proven right or wrong.
dsmcurse you need to figure out how to use the quotations feature on here, it looks like your arguing with yourself in the post above.

. but a black FMIC is definitely sleeper!