[Tigers] Aluminum Heads--a downside?

[drmayf]

Yep, again. Shouldn't paint the alloy heads. Unless it is with a special 
paint designed to do the job. And the coating probably would need to be 
very thin. Ditto for polishing. Smooth shiney surfaces do not have the 
surface area for proper conduction and convection.  On high compression 
motors, then the heads may mean the difference between working reliably 
and not working well at any efficiency. Detonation is likely to result 
with high compression reworked iron heads. The you have to run high 
octane fuel and dial back the timing to prevent it..

Sean, what is gonna happen to the black turbo headers? Anything for me 
to be on the lookout for?

Folks, Sean, and his brother in law, coated my headers for the race 
beamer and they look wonderful. Trust what Sean tells you in this 
regards. They do great work!

mayf
Drmoonstone at aol.com wrote:

>Essentially correct. Too everyone, for the last time I, AM NOT TALKING ABOUT 
>THE DOWNSIDE OF ALUM HEADS BUT THE DETRIMENTAL EFFECTS OF PAINTING AND 
>POLISHING ALUM HEADS. If you are running higher compression ratios you need Alum 
>heads and any degradation to heat transfer effects the performance and durability 
>of an alum headed engine! In some cases the increase in retained heat can 
>cause failure due to heat retained and lose of Hp. 
>
>We have a tell all in our Cermakrome line that causes the coated header to go 
>dull and gray at sustained heat exceeding 1350 degrees F (melting point of 
>the alum used in the cermaic/metallic coating). If it's dull and gray the engine 
>is running super rich or very lean...all effecting performance of the 
>product. 
>
>Moonstone