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Sometimes the design requirements don't allow you to use fins. I've used wide path spacing with a ball mill to increase the surface area of a fairly smooth plate. The porosity of the plenum casting increases the surface area. Yes an increased surface area will move more heat. Like the diff cover you illustrated. The point is, any surface will transfer heat. Fine, you want some measurements? I just checked, and after driving 20 minutes in 81F ambient, the air (yes, hood closed) while the engine is idling (least airflow) is 150F. Plenum is 175F. That's a nice 25 degree delta. I do not know how much the thermal dispersion coating affects the rate compared to bare aluminum, but the point is that it improves it. Powdercoating and paint are insulators, which I'm sure you will agree is the opposite of what we want. I do not have IAT instrumented yet, but plan on it. I agree that if someone is thermal coating something, they would be best off coating the radiator and intercoolers, but if they have the plenum off and were going to coat it anyway, thermal dispersion coating is a much better option than powdercoating.
-Dan VTC Solenoid Caps and install instructions.
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