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#24853 - 05/15/07 10:29 pm powder coat cylinder barrels?  
Joined: Apr 2006
Posts: 6
grif0092 Offline
BritBike Forum
grif0092  Offline
BritBike Forum

Joined: Apr 2006
Posts: 6
duluth, mn
hey folks,
i have a bsa a10 and was wondering about powdercoating the cylinder barrel, yea or nay?
let me know! thanks!

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#24854 - 05/15/07 11:08 pm Re: powder coat cylinder barrels?  
Joined: Dec 2006
Posts: 3,750
btour Online content
BritBike Forum member
btour  Online Content
BritBike Forum member

Joined: Dec 2006
Posts: 3,750
Massachusetts, U.S.A.
Why not, Panic? Curious.


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.
#24855 - 05/15/07 11:41 pm Re: powder coat cylinder barrels?  
Joined: Aug 2001
Posts: 1,182
Mike Carter R.I.P. Offline
In Remembrance
Mike Carter R.I.P.  Offline
In Remembrance

Joined: Aug 2001
Posts: 1,182
Altoona, Florida
There has been plenty of discussions on this and many other boards regarding lack of heat transfer because of powder coating...They came from the factory with stove enamel on them not much different from powder of today I have several bikes powder coated with no ill effects...Some people say even polishing covers causes the engines to run hot but....Whatever you like should work I have some with engine paint looks just as good.. :rolleyes:


Later


Mike Carter

#24856 - 05/16/07 1:03 am Re: powder coat cylinder barrels?  
Joined: Mar 2005
Posts: 731
ca7a Offline
BritBike Forum member
ca7a  Offline
BritBike Forum member

Joined: Mar 2005
Posts: 731
Asheville, North Carolina
Strictly for the heat ransfer mechanism, no coating is best. And given that the A7/A10 barrel is cast iron and the finning is somewhat minimal, rust and thick coatings ought to be avoided.
For moderate roadwork, however, Mike's comment is fine.

#24857 - 05/16/07 2:46 am Re: powder coat cylinder barrels?  
Joined: Aug 2001
Posts: 3,348
BONZO R.I.P. Offline
In Remembrance
BONZO R.I.P.  Offline
In Remembrance

Joined: Aug 2001
Posts: 3,348
Michigan, USA
Even though I am a fan of powder coatings , I am in the "NO" camp on this one myself . The way I look at it , ading any coating is like throwing a blanket around the part , keeping heat in . This is good in an exhaust system , but bad on a cylinder barrel where you wanna remove heat . probably wont make a difference on an occasionally ridden bike ??

Just my .02-BONZO

#24858 - 05/16/07 2:58 am Re: powder coat cylinder barrels?  
Joined: Jul 2006
Posts: 1,082
J. Charles Smith Offline
BritBike Forum member
J. Charles Smith  Offline
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Joined: Jul 2006
Posts: 1,082
Westminster, MD, USA
From what I understand, not all coatings are insulators. For example, Kal-Gard is supposed to transmit heat better than aluminum - and much better than cast iron. Plus, being darker, it also radiates heat more efficiently. Brit-Tech, for one, also markets coatings designed to improve heat transfer.

#24859 - 05/16/07 3:17 pm Re: powder coat cylinder barrels?  
Joined: Aug 2001
Posts: 4,069
KC in S.B. Online content
BritBike Forum member
KC in S.B.  Online Content

BritBike Forum member

Joined: Aug 2001
Posts: 4,069
Santa Barbara, California
So has someone actually got a bike with powder coated cylinder?? Not sure if Mike Carter meant the cylinder was coated.. smile . I have a basket A65L, with Maroon powder coated EVERYthing! :rolleyes: , which at the time seemed like it could be interesting in a "retro" kind of way. Anyhow, I was also worried about the cylinder heat. cool KC


Down to 1 BSA, 2 Triumphs, 2 '56 Chevys
#24860 - 05/16/07 3:56 pm Re: powder coat cylinder barrels?  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

BritBike Forum member

Joined: Sep 2002
Posts: 7,812
Seattle
I did a radiative heat transfer analysis about a year ago with a .010" powdercoat thickness on a simple cylinder and found it raised the temperature by less than 1 degree F. Admittedly a simplification, but probably sufficient for an order of magnitude asessment. It satisfied me to the point where I have powdercoated the barrel on my SS90.


A smattering:
'53 Gold Flash
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sixtyseventy Lightboltrocket road racer...and many more.
#24861 - 05/16/07 9:32 pm Re: powder coat cylinder barrels?  
Joined: Sep 2005
Posts: 461
bonnie john Offline
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bonnie john  Offline
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Joined: Sep 2005
Posts: 461
sunshine coast, queensland, au...
" radiant heat behaves in a very similar manner to light;it travels in straight lines, and is reflected by a polished surface and absorbed by a dull black one. the latter process is reversable, and therefore a polished surface emits less heat by radiation than a black on. the rate of emission from a polished surface is approximately one-tenth that from the same surface covered with a thin film of lamp-black, and the emissivity of a cast-aluminium surface is increased about 10 per cent by a THIN coating of black paint"

motorcycling engineering (1976) by phil irving, page 183, head design and materials


SPEED KILLS
do not exceed 250mg ...

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