[urq] Urq, WX, Head Problems, etc.

[QSHIPQ at aol.com]

Not pro, but a lot of btdt here.  Get the sodium filled valves, they  are 
designed to *not* have heat spikes by spreading the heat thru the valve via  
sodium.  SS valves are ok, and what most 'other' turbo manufacturers use  because 
they are cheaper than sodium.  I wouldn't use 034 experience here,  I would 
expect Javad to blow up a lot of things as he bullies those I5 motors  until 
something gives.  That doesn't at all mean that at 300ATWHP on a  10vt, that a 
sodium valve isn't appropriate.  IME, sodium valves, with  enough abuse, will do 
what all valves do when they fail.  I also wouldn't  build an I5 turbo motor 
without them.
 
Regarding monies, 700 for a rebuild sounds reasonable to me for good  
workmanship.
 
HTH and my .02
 
Scott J
 
 
In a message dated 5/19/2007 11:46:53 P.M. Central Standard Time,  
larichard at plguide.com writes:

JP,

Your mechanic may be right: 25 years later, maybe new SS  valves are cheaper
and still good enough for high-temp turbo operation.  Another point of view
is the traditional "over-engineering" Audi put in  these cars; maybe
sodium-filled valves are the way to go to render these  engines bulletproof
(and we know they are), but for a car that will not see  track duty, and
being used as a week-end ride, I wouldn't be scared by a  new set of SS
valves. In fact, the bottom end is still 25 years old.  

700$ for a rebuilt ? In my book, that is very reasonable, as I spent  the
same amount (in CDN$) just for the welding work and the valve seats  (valves,
springs, retainers and guides were re-used). 

I'd like to  hear the point of view of the pro mechanics among us: Scott ?
Martin ? Ado  ? Jim ?

Louis-Alain


 



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