RE: 2 different 12v V6's? [Was: V6 Oil Filter numbers]

["Dupree, Jim" <dupree@alldata.com>]

Actually there are at least three different 12v V6 engine used by Audi in
the US anyway.
The following is based on my interpretation of the Audi service manuals and
may not reflect reality.

AAH was used in 90/Cab/100/A6 models from 1992 model year through the first
half of 1995 model year.
Some modifications to the valve train in production at about 8/94.
Lubrication system changes introduced in production about 8/94.

AFC was used in 90/Cab/A6/A4 models from the second half of 1995 model year
through 1997model year.
	The Cabriolet may have used it through 1998, Cabriolet manual show
only AAH and AFC.
	The A4 only had AFC through 1996 model year.
	The AFC got the changes to the lubrication system that includes the
new oil filter. (there is a TSB on it)

ACK was used in the 1997 model year A4.
	No changes from the AFC engine are indicated in the manual.

AHA 2.8L V6 5 valve engine was used in A6/A4 starting in 1998.


Thanks
Jim Dupree
 <mailto:dupree@alldata.com> dupree@alldata.com


	-----Original Message-----
	From:	Sean_Ford@idx.com [SMTP:Sean_Ford@idx.com]
	Sent:	Thursday, January 28, 1999 5:04 AM
	To:	Michael Murphy; quattro@coimbra.ans.net
	Cc:	quinn@hns.com; Chris Newbold; duane@hunch.zk3.dec.com;
Mark_Quinn.H@hns.com; Elliott Potter
	Subject:	2 different 12v V6's? [Was: V6 Oil Filter numbers]

	I have to admit ignorance on this topic. I did not know that there
were 2
	different 12valve V6's out there; the AAH and the AFC. I've got an
early
	build AAH, and all of its inherent problems. Luckily, I'm a low
mileage
	driver and so I'm not necessarily seeing EVERYTHING that could go
wrong
	with my engine.

	My question is, what are the main differences between the AAH and
the AFC
	engines? Elliott Potter has mentioned that the AFC engine received
an
	oiling system with a higher flow rate to ensure that the top end is
	swimming in oil. Apparently, that is not the case in the AAH engine
and,
	frankly, that worries me. A lot.

	I wonder what other changes were made to the 12valve V6, and why? I
highly
	doubt that any answers would be forthcoming from AoA, nor from the
	FatherLand...  seems to be their SOP, and probably an admission that
	SOMETHING was wrong. You should see/hear the denials that anything
was ever
	wrong with the early V6 head gasket, and they'd like you to believe
that
	the head gasket design change in '93 was simply a cosmetic thing.
Don't get
	me started on that... f'n $1600!

	So, who knows? Anyone?

	Sean Ford
	'92 Audi 100CS 5-spd 43k mi
	http://www.geocities.com/MotorCity/Downs/5528




	Michael Murphy <mmurphy@nais.com> on 01/28/99 06:37:46 AM

	To:   quinn
	cc:   Chris Newbold <Chris_Newbold@transarc.com>, Sean
Ford/BOSTON/IDX1,
	      duane@hunch.zk3.dec.com, Mark_Quinn.H@hns.com,
nstickney@hns.com,
	      Elliott Potter <epotter@abraxis.com>
	Subject:  Re: V6 Oil Filter numbers
	Body:



	To all,
	The long filter appeared with the switch to AFC engine in mid 1995.

	In the filter catalogs, confusion reigns supreme on the AFC filter.
	BoschUSA #72199 is 142mm high, no anti drain and a bypass setting of
	11-17psi.  Mann's W719/25 is 132mm high, anti drain and bypass set
to
	27-35psi. Don't know what Mahle's OC154 is (no catalog).  For the
	filters database, I am trying to find out from AoA what are the
correct
	specs for the AFC motor, but no joy so far (no surprise there).
	---
	Mike Murphy

	quinn@hns.com wrote:
	>
	> Chris Newbold wrote:
	>
	> >I'm with Sean, here. Why did Audi switch to the larger filter?
Prior
	> >to this thread, I had thought the larger filter was introduced
with
	> >the 30V motor. I could understand a larger filter in such an
application
	> >(presumably they need more flow). But it seems like the larger
filter
	> >appeared quite some time before the 30V...
	>
	> Ohhh, this (earlier long filter change interval) is news to
	> me.  Kinda throws out my theory of the bigger filter being
	> for the longer interval then, doesn't it?
	>
	> BTW ... my A4 is a '97 with the 12v V6.  The '96s have the big
	> filter also.
	>
	> -Mark Quinn