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Heat Dissipation

Started by Andy M, Feb 02 2012 07:52 PM

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#1 Andy M

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Posted 02 February 2012 - 07:52 PM

What is the general consensus re heat dissipation. I am building a B175 engine for trials, I am using a modified Fantic 200 cyl head which has a larger finned area etc, they can get hot during trials in the warm months and they are centre plug head. On the Fantic they were black, just wondering is it best to paint or get blasted to bare ally. ?? I will be painting the barrel and using a Suzuki TS185 piston. Thanks in advance.... :thumbup:
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#2 paul w

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Posted 02 February 2012 - 08:02 PM

Black

#3 GII

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Posted 02 February 2012 - 09:19 PM

:agreed:



Best though, do both

Get it blasted back to bare aluminium, then immediately paint it black before oxides get in the way
Gordon

#4 tankygsy

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Posted 02 February 2012 - 11:33 PM

Have it flame sprayed with a thermal coating...

#5 Dadof2

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Posted 03 February 2012 - 10:38 AM

A freshly sand blasted surface gives the best heat dissipation. However this declines as aluminium oxide (anexcellent insulator) forms. Therefore for best long term dissipation a matt black paint is best.
I wonder what they (manufacturers) use to control / prevent oxide build up on the currently popular unpainted aluminium radiators? although maybe it is not such a problem as radiators never get anywhere near as hot as air cooled cylinder heads.
Cheers

#6 charlie prescott

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Posted 03 February 2012 - 11:46 AM

Hi Guy's.
Hi Andy.
Give Porl Joynes, at Redditch Shot Blasting a ring.

Regards Charlie. :thumbup:

#7 RodT

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Posted 03 February 2012 - 06:01 PM

Do you have a nice alloy barrel as well, Andy or the cast iron original ? :)

Edited by RodT, 03 February 2012 - 06:02 PM.

#8 Andy M

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Posted 03 February 2012 - 06:18 PM

View PostRodT, on 03 February 2012 - 06:01 PM, said:

Do you have a nice alloy barrel as well, Andy or the cast iron original ? :)

Original... will be black... :popcorn:
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#9 jon v8

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Posted 03 February 2012 - 06:39 PM

This is what yer need -
See you at Telford. :thumbup:

Edited by jon v8, 03 February 2012 - 06:39 PM.

#10 Andy M

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Posted 03 February 2012 - 09:26 PM

Before my time Jon...... :D See you there, bring loads of money.. ;)
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#11 copemech

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Posted 04 February 2012 - 03:22 AM

I seem to recall official testing on this subject done " back in the day" which revealed little to no real difference in heat dissapation.

I doubt excess paint is good, yet the oxidation of bare metal is not either. If old paint were thick, I would strip and re-apply! :thumbup:
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#12 JSE

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Posted 04 February 2012 - 04:51 AM

View Postcopemech, on 04 February 2012 - 03:22 AM, said:

I seem to recall official testing on this subject done " back in the day" which revealed little to no real difference in heat dissapation.

I doubt excess paint is good, yet the oxidation of bare metal is not either. If old paint were thick, I would strip and re-apply! :thumbup:

Years ago we did dyno testing of coatings and found a flat black finish gave about a 15% reduction in internal heat. To reflect external heat source, a light color, like white, worked well.

Jon
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