Painting battery box to reflect heat from goats belly - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 03-11-2009, 04:53 PM Thread Starter
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Question Painting battery box to reflect heat from goats belly

The inside of battery box has some rust and corrossion inside it. I`m waiting for the weather to warm up, so that I can remove the box to clean and paint it. I still have the stock exhaust with goats belly in place, and no plans to remove it. I do plan to relocate the R/R from the bottom of the battery box to a position next to the left passenger footpeg, while I`m in there.

I`m wondering if painting the bottom of the box white or silver, will reflect enough heat from the battery, to go to the trouble of using two different colors on the box?

I`m also thinking the R/R should be lightly wire brushed, and a couple of light coats of black paint applied, to radiate or dump the heat more efficiently. What do you think? Paint it or just clean it off and leave it natural color?

The rad in every car or truck I have ever seen, is painted black.

Conversely the radiators for the hot water heating in my old elementary school, at the back of every classroom were painted silver (back in the 60`s). That may have been more for esthetics than efficiency though.

Gordon

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post #2 of 14 (permalink) Old 03-11-2009, 06:24 PM
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Quote:
Originally Posted by OlHossCanada View Post
The inside of battery box has some rust and corrossion inside it. I`m waiting for the weather to warm up, so that I can remove the box to clean and paint it. I still have the stock exhaust with goats belly in place, and no plans to remove it. I do plan to relocate the R/R from the bottom of the battery box to a position next to the left passenger footpeg, while I`m in there.

I`m wondering if painting the bottom of the box white or silver, will reflect enough heat from the battery, to go to the trouble of using two different colors on the box?

I`m also thinking the R/R should be lightly wire brushed, and a couple of light coats of black paint applied, to radiate or dump the heat more efficiently. What do you think? Paint it or just clean it off and leave it natural color?

The rad in every car or truck I have ever seen, is painted black.

Conversely the radiators for the hot water heating in my old elementary school, at the back of every classroom were painted silver (back in the 60`s). That may have been more for esthetics than efficiency though.
I would not paint the R/R, any paint will reduce the heatsink's ability to remove heat. Instead of painting the bottom of the battery box you could cut a piece of thin aluminum the size of the bottom and bolt where the R/R was with spacers to act as a heat shield.


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Last edited by lance328; 03-11-2009 at 07:43 PM.
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post #3 of 14 (permalink) Old 03-11-2009, 07:32 PM
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i painted mt r and r

1990 Kawasaki Vulcan 750

.... slightly modified
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post #4 of 14 (permalink) Old 03-11-2009, 08:42 PM
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My battery box it had acid spilled all over it. The acid had eaten through the paint and left bare metal which promptly rusted. I pulled the box out, used a dremmel with a wire wheel to clean it up then painted it with a product called "Rust Bullet". Supposed to be as near as good as the factory finish without all the powdercoating expence. I used an airbrush to apply but they say it can be brushed on. Looks pretty decent, I used the same process on my tank because the finish on the tank was trashed also. I did leave the R/R alone though. I believe it is aluminum and shouldn't rust if you think it needs slightly sanded/cleaned up.

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post #5 of 14 (permalink) Old 03-11-2009, 10:12 PM
 
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Degoat + Quiet Aftermarket Mufflers?

Hey OlHoss --

I know you don't want to remove the goat's belly, but one unexpected benefit for me was that the bike runs cooler. The heat gauge needle is noticeably further to the left (cold) side!! Most of you folks already know this but it was a pleasant surprise to me!

Today as I practiced riding skills in a parking lot: hard braking, weaving, figure 8's, etc I noticed that the fan did not come on right away. Remember this is Florida. It reach 80o today. At first I thought it might be another electrical problem, but it's just that the bike is running cooler! The fan eventually came on later in the session.

OlHoss, I wonder if it may be possible to degoat and find some very quiet mufflers? Best of both worlds!

Just a thought.



Quote:
Originally Posted by OlHossCanada View Post
The inside of battery box has some rust and corrossion inside it. I`m waiting for the weather to warm up, so that I can remove the box to clean and paint it. I still have the stock exhaust with goats belly in place, and no plans to remove it. I do plan to relocate the R/R from the bottom of the battery box to a position next to the left passenger footpeg, while I`m in there.

I`m wondering if painting the bottom of the box white or silver, will reflect enough heat from the battery, to go to the trouble of using two different colors on the box?

I`m also thinking the R/R should be lightly wire brushed, and a couple of light coats of black paint applied, to radiate or dump the heat more efficiently. What do you think? Paint it or just clean it off and leave it natural color?

The rad in every car or truck I have ever seen, is painted black.

Conversely the radiators for the hot water heating in my old elementary school, at the back of every classroom were painted silver (back in the 60`s). That may have been more for esthetics than efficiency though.
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post #6 of 14 (permalink) Old 03-12-2009, 04:23 AM
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Quote:
Originally Posted by FlaRider View Post
Hey OlHoss --

I know you don't want to remove the goat's belly, but one unexpected benefit for me was that the bike runs cooler. The heat gauge needle is noticeably further to the left (cold) side!! Most of you folks already know this but it was a pleasant surprise to me!

Today as I practiced riding skills in a parking lot: hard braking, weaving, figure 8's, etc I noticed that the fan did not come on right away. Remember this is Florida. It reach 80o today. At first I thought it might be another electrical problem, but it's just that the bike is running cooler! The fan eventually came on later in the session.

OlHoss, I wonder if it may be possible to degoat and find some very quiet mufflers? Best of both worlds!

Just a thought.
HD Dyna mufflers will do the job, and they can be had for around 40-50 bucks a pair. There's even a write up in the Verses about mounting them.

Hoss, I know alot of people who've shot some paint on the R/R without any issues as of yet. Some have looked pretty nasty being stained from battery leakage, which really stands out once it's mounted out in the open.
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post #7 of 14 (permalink) Old 03-12-2009, 05:51 AM
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The emissivity of polished aluminium is rather poor. The emissivity of black or white paint is good. A painted r/r will dissipate heat more efficiently than no coating at all.
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post #8 of 14 (permalink) Old 03-12-2009, 07:07 AM
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what about making a heat sink on the bottom of the battery box out of aluminum?
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post #9 of 14 (permalink) Old 03-12-2009, 11:17 AM
 
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Quote:
Originally Posted by 750Doug View Post
HD Dyna mufflers will do the job, and they can be had for around 40-50 bucks a pair. There's even a write up in the Verses about mounting them.

Hoss, I know alot of people who've shot some paint on the R/R without any issues as of yet. Some have looked pretty nasty being stained from battery leakage, which really stands out once it's mounted out in the open.
That's a good piece of information, Doug!

Thanx!
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post #10 of 14 (permalink) Old 03-12-2009, 04:13 PM
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Quote:
Originally Posted by pappa View Post
The emissivity of polished aluminium is rather poor. The emissivity of black or white paint is good. A painted r/r will dissipate heat more efficiently than no coating at all.

No it won't. The fact that the R/R is NOT "polished" aluminum , but a rough/cast aluminum means it wil disapate heat better than ANY coating. This idea has been discussed alot on seveal forums and the answer is always the same.

You can paint the R/R with a light coat of High temp paint, it won't really help it, but to say it makes it worse would be a stretch anyway, if you have relocated the R/R to start with.

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