 Push rod tube painting, Is it OK |
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| whitey |
 Apr 22 2007, 06:34 PM
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#1
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Member  Group: Members Posts: 146 Joined: 8-February 07 From: Coto de Caza Member No.: 7,508  |
I'm repainting my engine tin and resealing the engine...is it OK to paint the push rod tubes or do they need to left alone for cooling or ?
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| Bleyseng |
Apr 22 2007, 06:42 PM
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#2
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
No, don't paint them and if they are rusty get new ones as they are fairly cheap.
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| Dave_Darling |
Apr 22 2007, 07:28 PM
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#3
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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You can paint them if you really want to... They contribute some cooling, but not a huge amount that I have been able to tell. A very thin coat of flat black may help them radiate heat slightly better--but a thick coat of paint (especially one that looks really nice!) will keep heat from transferring as well.
I'd leave them alone, myself. But then again, I'm lazy. --DD |
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| jd74914 |
Apr 22 2007, 08:55 PM
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#4
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Its alive Group: Members Posts: 4,782 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
If you paint them with a thin coat of bright colored paint its easier to find leaks.
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| Pat Garvey |
Apr 22 2007, 09:14 PM
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#5
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Do I or don't I...........? Group: Members Posts: 5,899 Joined: 24-March 06 From: SE PA, near Philly Member No.: 5,765 Region Association: North East States |
Pink is a nice, cool color. Of course, it will soon be covered with oily brown, which is pretty cool for model railroad stuff.
Why? |
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| brer |
Apr 23 2007, 12:13 AM
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#6
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Advanced Member Group: Members Posts: 2,555 Joined: 10-March 05 From: san diego Member No.: 3,736 Region Association: None |
not that it makes a difference but..
flat black has an emissivity of .97-.99 which is one of the highest of all finishes, but it has a 1:1 ratio between emissivity and absorptance, so it will absorb heat at the same rate. white (depending on brand of paint) can have up to .92 emissivity. Not really much of a difference comparatively with black, but it has a 3:1 ratio Em/Abs with only .22 or so absorptance. In a hot environment white can sometimes be a better choice due to the fact that it sheds heat quickly but is not absorbing other radiation resulting in a cooler object. What is important is the equillibrium temperature the object has, basically the balance between its absorption and emission. White will always have a lower equillibrium temperature than black. Not that it makes a bit of difference though in this situation, like I said. Dont polish your engine case though, as that will drop the emissivity from about .20 for oxidized aluminum down to about .03 or less depending on how much time you spend with the Mothers. (IMG:style_emoticons/default/smoke.gif) |
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