[s-cars] RE: AAN CR vs 3B vs gaskets

[mlp qwest]

I doubt this will resolve anything but, (a) FWIW and (b) IMO I'm going to
(c) agree with both Mihnea and Scott, cause it's too dangerous to disagree
:-) as follows:

1.  While I didn't do the actual removal, I was told on at least one of my
'93 AAN motors that the "old style felt/paper head gasket was removed, and
replace with the new steel version...." so at least some of the AAN's came
with something other than the newer steel gaskets, and I believe someone
commented on the progress of Cody's rebuild that his old block was, I think
fitted with the original gasket which wasn't steel?  Cody do you know?

2.  On the compression ratio, I can't see the factory still maintaining and
consistently publishing a 9.3 to 1 CR claim for the AAN even after use of
the steel gasket became common place.  Without actually measuring and
comparing the compressed height of the a steel vs. the older felt gasket, I
don't think there is any compelling reason to conclude that one is
necessarily thicker than the other, therefore CR with the steel gasket is
dropped 3/10ths of a point.

I'd like to suggest the next time someone has a spark plug out; a burst of
energy coupled to a spat of unrequited curiosity; and a burette of some
suitably slimy fluid sitting about, perhaps they might move the questionable
cylinder's piston up to TDC and fill the remaining volume with a carefully
measured volume of vegetable oil or hydraulic fluid and report back on the
results?

HTH
Mike

~-----Original Message-----
~From: Mihnea Cotet [mailto:mik at info.fundp.ac.be]
~
~I beg to differ Scott, I know of at least 5 AAN motors fitted from the
~factory with paper (no fiber there) headgaskets, I've even helped with the
~metal gasket swap, and so can I give you a few email addresses of
~people in
~the UK who have BTDT too.
~
~Mihnea
~
~At 16:30 2/02/2004 -0500, QSHIPQ at aol.com wrote:
~>Minhea:
~>Just so you know, the AAN was the intro of the metal head gasket for audi
~>20vt (read ALL AAN motor cars had metal head gaskets from the
~>factory).  So, I don't think the below is true.  The 3B was the only 20vt
~>to run the fibre head gasket, and it was also rated at 9.3:1.  I doubt
~>that changing the 3B to the metal gasket does a darn thing to the CR
~>(beyond normal production tolerance).  Then again the fibre head gasket
~>for the 3B has been superceded to the metal head gasket at audi, and even
~>the aftermarket has switched to metal head gaskets.
~>
~>SJ
~>
~>
~>In a message dated 2/2/2004 10:55:26 AM Eastern Standard Time,
~>mik at info.fundp.ac.be writes:
~>
~> > Yes the AAN has 9.3:1, but only when it has a paper head
~> > gasket.
~> >
~> > HTH,
~> >
~> > Mihnea
~
~
~