In need of an MC head, and another question

[Joseph Rae]

Speaking of valves there has been some talk of not using the sodium
filled valves but using SS valves for the exhaust side. Something about
the sodium valves having a weld that breaks killing the engine, A guy in
the NW just replaced an engine, and had the head done with SS valves for
this reason.

Joe


-----Original Message-----
From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com] On
Behalf Of Burl Vibert
Sent: Thursday, August 09, 2001 5:02 PM
To: JShadzi at aol.com
Cc: mike at borderlinemotorsports.com; urq at audifans.com;
quattro at audifans.com
Subject: Re: In need of an MC head, and another question




JShadzi at aol.com wrote:
> 
> Mike, I don't think I have ever seen an MC head _without_ cracks 
> between the vavles.  Cracks are actually quite normal, there is a 
> factory spec. for what is acceptable and what is not based on the size

> of the crack.  I would bet your cracks are likely ok, any local 
> machine shop could rebuild your head for under $300 quite easily.  You

> shouldn't need to dump a ton of money on this unless your head really 
> is bad, which then you can get a used head and start over.
> 


Cool, this applies to me as well.  I saw the cracks and thought the head
was finished, never even thought of checking the manual to see if this
is acceptable.  As per the Bentley; "cracks between the valve seats  or
between valve seat and first threads of the spark plug holes, can be
reused and refaced without reducing the service life if the cracks do
not exceed a width of 0.5mm (0.020").

Guess I just need valves then, that's a load off.  I hope.

Burl Vibert
1987 5kcstq
Kingston, Ontario