2-piece exhaust MF, 10v turbo question

[E. Roy Wendell IV]

> From: Alex Kowalski <hypereutectic1 at gmail.com>
> Subject: 2-piece exhaust MF, 10v turbo question
> To: quattro at audifans.com
> Message-ID:
> 	<1030738a0602081958wfa89542i254a0d4a0b790e74 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> OK on to the next issue.  In anticipation of the engine swap I'm going 
> to do
> on the '86, and because I enjoy spending money on Audi parts that I 
> might
> never use, a few weeks ago I bought a 2-piece exhaust manifold for the 
> 10
> valve MC1 turbo from Canada.  The manifold arrived and it's in very 
> nice
> shape EXCEPT for a hairline crack...but not where you might expect.  
> The
> crack is at the base of the "Y" where the runners meet at the turbo 
> inlet.
> The crack is horizontal, hairline about 1/4" from the base of the Y and
> extends back into the manifold outlet about 3/4".  If you go to this 
> page
> and scroll down to the picture where the two manifolds are juxtaposed,
> imagine a hairline horizontal crack about 1/4" up the base of the "Y."
>
> This puzzled me, because it doesn't seem to fit the usual description 
> of
> cracks that develop on these manifolds. Otherwise, it's in very nice 
> shape.
> I am aware of Phil Payne's idea that the cracking is precipitated by 
> motor
> mount failure, of course I'll be replacing mine on both cars soon.  The
> question:  can I have this crack welded?  Any speculation as to why it
> appeared there, of all places?  I'd like to use this manifold but I
> certainly don't want any bits flying out and being ingested by the
> turbocharger...
>
> Cheers,
> Alex

Ok, if I'm interpreting you correctly, the crack is in the flow divider 
internal to the manifold and does not extend from the inside exhaust 
flow area to the outside world. I'm sure I'll be just the first of many 
to say "and your problem is?". Every one of the one piece manifolds 
I've looked at has similar cracks. Unless it's letting exhaust leak out 
of the manifold there's no harm done.

Roy