[Vwdiesel] vw 068 103 373M cylinder head

[LBaird119 at aol.com]

In a message dated 6/6/2009 4:20:35 PM Pacific Daylight Time, 
ktzkarz at embarqmail.com writes:

> Does this mean that the exhaust valve is a non-magnetic alloy or
> that the valve is sodium filled?
> 

  Sodium filled valves are used on hot running engines that need 
to dissipate heat rapidly from the exhaust valve to the head.  
Since diesels run roughly half as hot as a gasser under similar 
conditions, it's unlikely you'll find any/many diesels that have 
soduim filled valves.  The sodium is only in the stem, not the head/
face.  
  I know there are others out there but the only engine I know 
difinitively has sodium filled valves is the Porsche 914.  Not all 
the engines had them.  I do know the 1.7 does though.  I wouldn't 
be surprised if my 911 does but I'd have to read up on it again.  
It's easy to tell because the stems are about 1.5x or slightly more, 
as big as a comparable exhaust stem or the same car's intake valve 
stem.
     Loren


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