Thermal coatings

[Shannen Durphey]

They were worried about chipping the coating with the cutter, not damaging the
tools.  They ground the valve faces with the coatings applied.  I think they
were less worried after the "guaranteed to work" steel shot failed to dent the
stuff.


Shannen

Dave Williams wrote:
> 
> -> The machine shop that I delivered the heads to said the coating in
> -> the chambers had to be removed before they could open the valve seats
> -> up.
> 
>  Sounds like a case of FUD to me.  I have to sharpen the stones on my
> Sioux seat grinder more often when grinding across the coated area, but
> it's no big deal.  A scraper-type machine like a Serdi shouldn't even
> notice the coating.
> 
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