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General Information => General => Topic started by: stewardc on January 31, 2008, 04:45:00 am
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Has anyone ever used this to paint a block? How was it?
http://www.por15.com/products.asp?dept=7
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What would be best?
Black or white?
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What would be best?
Black or white?
:?: :?: :?:
I asked "Has anyone ever used it"?
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I know their regular rust preventative paint is supposed to be excellent, and that it takes weeks to wear off of your skin from what I hear. I would imagine their engine enamel should be very good quality.
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What would be best?
Black or white?
:?: :?: :?:
I asked "Has anyone ever used it"?
I assumed that the block was paintable with the enamel. Didn't VWpaint some green?
I'm asking from a physics point of view... Heat dissapation or conservation.
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What would be best?
Black or white?
:?: :?: :?:
I asked "Has anyone ever used it"?
I assumed that the block was paintable with the enamel. Didn't VWpaint some green?
I'm asking from a physics point of view... Heat dissapation or conservation.
Aaaaah, so. Got it. Actually, I'm gonna use ford blue. Not dissipation, nor conservation, but restoration.
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What would be best?
Black or white?
:?: :?: :?:
I asked "Has anyone ever used it"?
I assumed that the block was paintable with the enamel. Didn't VWpaint some green?
I'm asking from a physics point of view... Heat dissapation or conservation.
From a radiation heat standpoint, black both absorbs and emits the best.
White/silver paints absorb and emit heat at much lesser rates, but I don't believe they would provide any insulating value. Not measurably, at least.
Not to mention white block paint would be a b*^&# to keep clean.
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i thought black is only good at absorbing light energy? as it is the absence of all colours, it cannot reflect and thus absorbs their energy, while white being all colours, reflects the light energy. does it really matter under the hood?
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Black does also dissipate heat better - one reason all rads get painted black if they are painted. Flat black also does a better job than gloss. As far as white - I have a 67 Ford that has drums on all 4 corners and they are powder coated white. I can tell you from experience that the brake fade is horrible and they take some time to cool back down. I would be willing to bet that if you painted your rad white you would experience some cooling issues.
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I have a 67 Ford that has drums on all 4 corners and they are powder coated white.
I would bet that's a function of the powder coat (and the brake design) rather than the color. The powder coat is much thicker than paint and also smoothes the surface reducing your surface area for heat dissipation. That & they are drum brakes.
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So would you want to retain heat in a block or loose it? :? [/color]
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Good question. Retaining would be theoretically better for efficiency. I think a lot of it might depend on what sort of climate you live in. Up north, retaining might be fine, but down here in the south, getting rid of heat could be more important.
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OK, I did a bit of research on colour/heat transfer on the net. (for what it's worth.)
http://www.eng-tips.com/viewthread.cfm?qid=165626&page=1
The following paint has ceramic particles in it to help dissipate heat:
http://www.amazon.com/Dupli-Color-Performance-Brake-Caliper-Paint/dp/B000B6DG4Uhttp://www.partsamerica.com/ProductListSimple.aspx?Category=3268
http://www.flyelectric.ukgateway.net/black_paint.htm
I also found one site that said that only colours in the infra-red scale would actually improve heat transfer. I guess you can prove anything on the internet.
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To answer the original question. I used The POR20 which is the high heat type on my headers. I have 3500 mi. on it with no cracking. plus the flat black looks sweet 8) But, as with any painting, you have to prep it right. I bead blasted my header before i painted it.
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To answer the original question. I used The POR20 which is the high heat type on my headers. I have 3500 mi. on it with no cracking. plus the flat black looks sweet 8) But, as with any painting, you have to prep it right. I bead blasted my header before i painted it.
Yeah, I used that (I think it's called Black Velvet) on my whole exhaust system. It looks great.