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Painting My Engine
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LDO107
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Joined: Jul 15, 2009
Posts: 63
Location: Pensacola Florida

PostPosted: August 23, 2009, 7:18 pm    Post subject: Painting My Engine

Since I'm making very little progress on my 83 XS650 Bobber build due to little time and even less money, I'm still in the planning stages for a heap of parts sitting in the garage.

I want to paint the motor and then powder coat the side covers. Black and silver color scheme (may not score high on originality but it's what I like).

Stock colors for this motor seem to be black for the cases and silver for the cylinders and heads.

I've gotten most of the PO's black paint off the cylinders and heads thanks to the pressure washer and degreaser.

Figured that black on the cylinders (maybe heads too) would help with keeping engine temps down a bit and really make the stainless and chrome fasteners stand out.

Here's a pic of a motor I did for a Sportster a while back.


Looking for advice on what you fellas think.

Pictures of 650 motors would help too!

Thanks in advance!
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baclay9
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Joined: Jul 30, 2009
Posts: 88

PostPosted: August 23, 2009, 7:52 pm    Post subject: Re: Painting My Engine

I just finished painting my engine but haven't done the case covers yet.


By claypool782, shot with DSC-T300 at 2009-08-22


By claypool782, shot with DSC-T300 at 2009-08-22

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cpt137
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Joined: Jan 10, 2009
Posts: 97

PostPosted: August 27, 2009, 7:10 pm    Post subject: Re: Painting My Engine

cgi.ebay.com/ebaymotor...MEWNX%3AIT
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bbjsw10
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Joined: Jul 15, 2009
Posts: 64

PostPosted: August 28, 2009, 2:26 pm    Post subject: Re: Painting My Engine

Should you worry about paint acting as a thermal barrier with these engines being air cooled, just a though. Carry on...
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xsleo
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Joined: Oct 28, 2007
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Location: Earlville NY

PostPosted: August 28, 2009, 6:17 pm    Post subject: Re: Painting My Engine

From some of what I have been reading, a coat of paint can increase the cooling. Some thing about an increase of heat transfer from metal to paint to air is faster than from metal to air.
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baclay9
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Joined: Jul 30, 2009
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PostPosted: August 28, 2009, 8:37 pm    Post subject: Re: Painting My Engine

I don't sweat stuff like that. It isn't going to make a hill of beans difference. Every new air cooled motor is painted. I know there are some that believe this but I just don't buy it.
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bbjsw10
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PostPosted: September 1, 2009, 3:23 pm    Post subject: Re: Painting My Engine

I was just wondering for myself on the cooling, I do sweat stuff like that. It looks great on it I do admit you are doing a fine job on it.
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DREDnot
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Joined: Sep 15, 2009
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PostPosted: September 15, 2009, 10:15 am    Post subject: Re: Painting My Engine

I have been told from a few sources that the black paint helps the heat transfer.
This is one of the reasons they paint radiators black.
Supposedly light colors and chrome reflect heat back inside.

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pumps
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Joined: May 29, 2007
Posts: 1993
Location: Kansas City, Missouri, U.S.A.- 1977 XS650 "D" Standard

PostPosted: September 15, 2009, 1:39 pm    Post subject: Re: Painting My Engine

DREDnot wrote:
I have been told from a few sources that the black paint helps the heat transfer.

Oh man do a google search on that and see what comes up!

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Joseph
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Joined: May 22, 2007
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Location: NY

PostPosted: September 15, 2009, 5:23 pm    Post subject: Re: Painting My Engine

The searches I'm coming up with are leading me to believe that black paint will absorb heat from the engine like black surfaces absorb heat anywhere and a bright surface will not absorb heat as quickly. If it absorbs heat it must let go of heat or it will eventually become an unbalanced equation. I know some of the xs's stock had black motors what part was black stock, barrels and case , I think? was it a gloss black or flat black stock? I think a black engine will be a bit cooler Question :?: .
Lets see some pics of color schemes on the engines.
I have too much time on my hands Rolling Eyes

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Mofokker
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Joined: Oct 22, 2008
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PostPosted: September 15, 2009, 6:36 pm    Post subject: Re: Painting My Engine

Just paint it and don't worry about it
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baclay9
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Joined: Jul 30, 2009
Posts: 88

PostPosted: September 15, 2009, 8:22 pm    Post subject: Re: Painting My Engine

I just feel like sometimes "we" as a community tend to overthink things. Like I said earlier, I just can't believe it would make enough difference to matter.
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acbanks
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Joined: Mar 21, 2009
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Location: Raleigh, NC, USA

PostPosted: September 15, 2009, 9:21 pm    Post subject: Re: Painting My Engine

Some heat is removed by thermal transfer to the air, and bare aluminum has the best properties of just about anything besides copper/gold/etc when it comes to this. Some heat is also emitted as infrared radiation, which is where the black color would help you. The best of both worlds is an anodized black finish, which is very very thin so the coating doesn't act like an insulator trapping the heat. Plenty of computer heat sinks are anodized black.

You can buy rattle can paints specifically designed for radiators. If you spray those conservatively, I don't think you'll have any problems with heat. They'll probably also stick to aluminum better than cheap paint.

More info:
www.jalopyjournal.com/...51362.html
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Schlemil
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Joined: Nov 24, 2009
Posts: 3
Location: San Bernardino, CA

PostPosted: November 24, 2009, 1:45 pm    Post subject: Re: Painting My Engine

Hi there,

I like the look of your engine. I am restoring a 1977 XS 650D right now and am trying to figure out what to do with my engine.

Did you take the engine apart before painting it? What kind of paint exactly did you use? Except for cleaning do you have to prep the engine before painting?

Thanks for the info.
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