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      06-15-2014, 09:57 PM   #1
AForceNinja
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Painting your FMIC black?

what do you guys think of this




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      06-16-2014, 07:34 AM   #2
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I can't imagine that black paint makes it colder. I watched the video and saw the results, I just can't grasp that.

I've always thought by painting you'd be slowing the flow somehow etc.

IDK more testing is needed for sure to confirm anything, but it was an interesting watch either way.
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      06-16-2014, 08:31 AM   #3
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Glad mine is black.
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      06-16-2014, 09:31 AM   #4
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I've painted mine with intercooler/radiator paint. It's fine. I can't see it changing temperatures to any measurable degree either way.
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      06-16-2014, 09:48 AM   #5
Dackelone
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This vid is quite interesting!
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      06-16-2014, 02:21 PM   #6
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Without airflow this makes me think that you get the most benefits when your car is idle on a hot day. This is actually really interesting.
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      06-16-2014, 06:18 PM   #7
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I had mine factory anodized black for the stealth looks and slightly to protect it. I doubt it helps it cool but it would be cool if it did.
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      06-16-2014, 07:13 PM   #8
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I would anodize before painting it, but radiator specific paint sprayed on should be OK. I like the stealth look.
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      06-16-2014, 08:22 PM   #9
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Totally makes sense honestly. Black color is much more efficient is both directions (in regard to surface temps), so I cant say I'm surprised given the IC is shaded. I had not heard of this before. Convection is totally different from Radiation so the difference w/ airflow and w/o is not surprising and the fact they showed negligible deltaT w/ airflow lends credence to their experiment. I wish they had conducted a run at higher temp to see if the IC would soak more as well as show the soak temps with paint and without. I'm considering picking up some intercooler paint and giving this a go with the stocker.
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      06-17-2014, 07:14 AM   #10
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While this is really cool and good to research etc, my opinion is that if your intercooler COLOR makes a significant difference, you probably should just upgrade your intercooler.

That being said after reading this I'd consider ordering a black one when the time comes to upgrade mine from stock. I doubt I'd go through the trouble of painting stock though.
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      06-17-2014, 07:31 AM   #11
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And I thought Wagner FMIC's were painted black just for esthetic reasons.
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      06-17-2014, 10:49 AM   #12
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I admit I skipped around in that video but I don't believe it's conclusion. Thermal energy (heat) is moved by conduction, convection, or radiation. When we are dealing with fluids we are by definition talking convection possibly with some radiation. Convection, transfer of heat by fluid movement, is not controlled by color. Radiant heat transfer is influenced by color which is why you see specific finishes (like matte black) on solor water heaters. But radiant heat transfer is a function of the temperature difference to the 4th power. We get energy this way from the sun due to it's incredibly high temperature. Comparitively, the temperature of the car engine versus the air is a very small difference hence the minor role of radiant heat transfer.

I suspect any variation in the results attributed to color were actually unintended difference in the test setup. It looked like things were just sitting on a bench and with that setup, it would be easy to get things closer or further away from the fan.

Paint things the color you think looks good. Don't paint them black to cool your engine better, you won't.
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      06-17-2014, 12:41 PM   #13
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Watching the whole video, the biggest difference was when they did not use the fan at all. With the fan on the difference in temps was not very much. They concluded the biggest benefit was at a stop light or on a drag strip starting line with the car standing still.

I'm not arguing the science part of test, just that the fan and distant to the fan didn't really have a bearing on their findings.
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      06-17-2014, 03:12 PM   #14
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Quote:
Originally Posted by rocketpop View Post
Watching the whole video, the biggest difference was when they did not use the fan at all. With the fan on the difference in temps was not very much. They concluded the biggest benefit was at a stop light or on a drag strip starting line with the car standing still.

I'm not arguing the science part of test, just that the fan and distant to the fan didn't really have a bearing on their findings.
I can accept that the fan distance didn't influence a test with no fan. But what about the way the temperature was measured or the hookup of the intercooler to the hair dryer(?). My point is that the test setup is too crude to be highly repeatable making the results suspect at best.

The mythbuster show has some of the same issues. One simple thing that would have to happen for the results to be credible from a scientific standpoint is they would have to be repeated. Preferably by somebody else. It is also highly preferable for the test to be "blind" where the bias of the tester cannot influence the result. I don't know how you'd do that but if this group has a bias that black paint would help, you might try and find researchers that think it won't help - to balance any unintended shifting of the result.

I don't see markings on the workbench let alone fixturing to ensure that the setup is the same for each test. That is exactly the sort of test where somebody with a preconceived bias will influence whether they are trying to or not. Also did they only test once? Or did they repeat it several times. For a scientific test, you would repeat it several times to be sure you get a fairly consistent result.

I think they made a nice little movie but didn't prove anything. Any heat transfer textbook will tell you convective heat transfer is not influenced by color. Constructing a crude relatively unscientific test doesn't disprove established scientific principles.
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      06-18-2014, 12:24 PM   #15
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