<VV> Broken valve seats

[Ian Harding]

Speaking of valve seats, how does everyone feel about heads with dents
in them from prior seat loss?  It seems like it would not
significantly change chamber volume, since material is just getting
"moved around" and as long as there aren't any _really_ sharp edges,
heating up and detonation should not be too bad....

I ran a Spyder like that for years with no trouble, and I now own some
110 heads with a pummelled chamber.  Just wondering what the
conventional wisdom was.  Can they even be welded up and smoothed out
if you wanted to?

- Ian

On 9/12/06, Bill Elliott <corvair at fnader.com> wrote:
> Ingest a valve seat at something over 6000 rpm and you'll be shocked
> what sorts of damage results to the other cylinders... gets sucked
> through the intake like a vacuum cleaner...
>
> Bill
>
> Clark Hartzel wrote:
>
> >How do pieces of a broken valve seat get into other cylinders?  On the
> >intake stroke the piston is sucking air into the cylinder and on the exhaust
> >stroke it goes out the exhaust tube.  Sounds impossible that a piece of
> >steel could be blown into another cylinder when the intake valve is closed.
> >Unless it happens at the overlap period when both valves might be open a
> >small amount.
> >Clark Hartzel
> >
> >
> >
> >
>
>
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