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xs650 > > Motorcycle Systems > > Engine > > Painting Head |
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wally Full Member
Joined: Apr 04, 2007 Posts: 538 Location: Sydney Australia
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Posted: April 1, 2008, 2:46 pm Post subject: Painting Head |
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Hi
Does painting the Barrels, Head & Rocker cover retain more heat within the engine?
Will it interfere with the transfer of heat out of the engine?
Thanks
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nj1639 Full Member
Joined: Aug 22, 2007 Posts: 839 Location: Switzerland County, Indiana
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Posted: April 1, 2008, 6:00 pm Post subject: Re: Painting Head |
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I'll be finding out soon enough. I did mine.
_________________ "Go ahead, turn the damn power and water off, I'm ready!
'83 xs650sk
www.650rider.com/index...pic&t=5392 |
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drifter 650Rider Supporter
Joined: Mar 25, 2008 Posts: 469 Location: Wilmington NC
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Posted: April 1, 2008, 6:36 pm Post subject: Re: Painting Head |
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painting the engine, heads, rocker boxes, barrels, etc. doens't lead to any excess in heat retention. I really doubt that the difference would even be measureable.
If there was a problem with heat retention on a painted motor, the factories would probably not paint them. Barrels being painted is quite common, and on many bikes the heads are painted as well.
As for heat transfer OUT of the motor, it has no effect. This was studies years ago with Harley Davidson motors, and it was found that the painted motor displaced the same amount of heat as the polished one did. Chrome also has no effect.
_________________ Drifter
Ace of Clubs
1978 XS650SE
"Never mind the track. The track is for punks. We are Road People. We are Cafe Racers." Hunter S. Thompson |
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mo650chopper WebMaster
Joined: Mar 13, 2005 Posts: 544 Location: Lonedell, Missouri
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Posted: April 1, 2008, 7:59 pm Post subject: Re: Painting Head |
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a black painted motor should run cooler than an unpainted one. Black paint, as I understand it, reflects heat out of a motor as well as a black painted object absorbs more solar heat than an unpainting or light color object. Some kind of science thing. I do know a polished motor will run hotter than an unpolished one.
_________________ Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body. But rather
to skid in sideways, hand grip in hand, body thoroughly used up, totally worn out and screaming "WOO-HOO what a ride!" |
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TheDude Full Member
Joined: Feb 15, 2008 Posts: 152 Location: Arcata, CA
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Posted: April 1, 2008, 8:31 pm Post subject: Re: Painting Head |
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Theoretically, the black paint would absorb heat from the sun creating more heat in the engine. Also, paint is a synthetic which is an isolator. Of coarse, that's theory. Practically, it sounds like it doesn't make a difference.
_________________ '78 XS650E Standard |
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dwyatt Full Member
Joined: Dec 21, 2006 Posts: 186 Location: Houston/Malongo, Angola
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Posted: April 2, 2008, 12:03 pm Post subject: Re: Painting Head |
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In theory mo650chopper is right, the darker color slightly improves heat transfer, some of that thermodynamics blackbody radiator crap, in practice the paint itself seals in about the same amont of heat that the blackness would help rid itself of. Still looks cool though.
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