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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Head Annodising
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Sat, 17 July 2004 02:35
 
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The thermal conductivity of pure aluminium = 2.165 W cm-1 K-1 at 20C
cast and wrought Al alloys can go down to around 1 W cm-1 K-1
for Alumina .276 W cm-1 K-1
so nearly ten times less transfer of heat through alumina.
aluminium is almost always anodised for corrosion protection and for appearance..
the other thing is, anodising is usually performed kinda like electroplating, ie the object is one electrode, and the solution causes accelerated oxidation of the surface.
it might be difficult to evenly anodise something like a head..
give it go if you want.. it would certainly look inteesting.
the colour from anodising is from dyes that go into the pores in the oxide that form during the anodising process... after dyeing, you chuck it into boiling water and this seals the pores with the dye inside.. or something like that 
i don't think much heat is lost from the surfae of a head anyway, compared to from the water jacket, as heat transfe to a liquid is higher than to a gas, if you finned the head, it might improve the heat transfer properties....
Cya, Stewart
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