[s-cars] Cylinder Head Crack- how bad is it

[Manuel Sanchez]

Wylie,

It's got about 138,000 miles on it.

I got the car at 100,000 and it have mtm 1+. Shortly thereafter I  
went RS2 spec, first with a custom tune from Mihnea and then a switch  
to Uncle Bob Pastore's hybrid chipset.

I can't really say if the mods had any affect or not, nor am I sure  
why these types of cracks develop in the first place. She's also got  
about 30 track days on her.

-Manny


On Nov 3, 2011, at 5:25 PM, Wylie Bean wrote:

> Hey Manny,
> How many miles on that one?  How long have you been running with  
> mods?  Are either of those more a factor than the other, or at all?
> Wylie Bean
> 90 cq
> 91 90q20v
> 92 UrS4
> 08 Q7
>
> -----Original Message-----
> From: <manuelsanchez at starpower.net>
> Sender: s-car-list-bounces at audifans.com
> Date: Thu,  3 Nov 2011 16:44:26
> To: <s-car-list at audifans.com>
> Subject: [s-cars] Cylinder Head Crack- how bad is it
>
> Fellow S-heads,
>
> Machine shop says my head is unrepairable.
>
> There is definitely a crack and according to the shop manual:
>
> "Cylinder heads with cracks between the valve seats or between the  
> valve seat and spark plug threads may be reused without reducing  
> service life, provided cracks do not exceed 0.5 mm (0.020 in) width  
> or when no more than the first threads are cracked".
>
> By the look of it, the crack extends 7 or 8 threads. The above  
> passage from the book says "no more than the first threads are  
> cracked". I just don't know if my photos qualify as only the first  
> few.
>
> Any advice is appreciated.
>
> Pics are here:
>
> <img src="http://forums.audiworld.com/picture.php? 
> albumid=73778&pictureid=233712">
>
> http://forums.audiworld.com/picture.php?albumid=73778&pictureid=233712
>
>
> <img src="http://forums.audiworld.com/picture.php? 
> albumid=73778&pictureid=233713">
>
>
> http://forums.audiworld.com/picture.php?albumid=73778&pictureid=233713
>
> Thanks.
>
> manny
> 95.5 ur S6 Avant
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