[s-cars] CPS mounting boss changes in early 92 - 93 AANs

[Mike Sylvester]

The RS2 intake will interfere with the 3B distributor cap. 
BTDT
Maybe it will clear the tuna can.

Mike

www.urq20v.com

> -------- Original Message --------
> Subject: [s-cars] CPS mounting boss changes in early 92 - 93 AANs
> From: "Ben Swann" <benswann at verizon.net>
> Date: Thu, July 31, 2008 10:36 am
> To: <forgied at shaw.ca>
> Cc: 'Ben Swann' <benswann at verizon.net>, s-car-list at audifans.com,
> "'Akiska, Erol'" <eakiska at uncc.edu>
> 
> 
> Dave,
> 
> I can't answer your question, but do happen to have a version of the head you describe.
> This supposedly RS2 head differs from the AAN head in that there is no mounting boss for
> the Cam Position Sensor as on the AAN head.  I have both side by side.  The distributor
> port is blocked off with a circular cutout, but I don't see how either distributor or
> front mounted hall would have been used. I think this Ear;u RS2" head is the same or
> similar as the one you have shown with the CPS boss - where do I get one of these?  I
> see you mention it below - contact info?
> 
> I don't know if I can even use a distributor with the RS2 intake manifold or not -
> haven't tried.  Tuna can?  Is that like an abbriviated distributor with hall pickup only
> in it?  More info. please as I am looking for alternatives for this head.
> 
> Ben
> 
> [Date: Wed, 30 Jul 2008 11:07:59 -0700
> From: David Forgie <forgied at shaw.ca>
> Subject: [s-cars] CPS mounting boss changes in early 92 - 93 AANs
> To: s-car-list <s-car-list at audifans.com>
> Message-ID: <cfb6d7695b2e3.48904b8f at shaw.ca>
> Content-Type: text/plain; charset=iso-8859-1
> 
> As you know, the cam position sensor (Hall sender) on the AAN engine is typically
> mounted on the head, behind the exhaust cam sprocket.? Exceptions are the very early
> AAN's that used a vestigial (tuna can) "distributor" at the back side (intake side of
> the engine), driven off a gear on end of the intake cam. That was a carry-over from the
> 7A and 3B engines (which had full distributors).
> 
> Up until yesterday, I always thought that when the CPS moved from the tuna can, to
> behind the cam sprocket, the mounting boss was cast into the head.? NOT so.? There is
> evidence (as shown in the link below) that the factory used up some 3B heads by
> supplying a separate mounting boss that was bolted to the head (and then the CPS was
> bolted to it).? I am curious as to when this practise started and stopped, based on
> build date.? So if you have such a non-cast boss, can you please post your car's build
> date?? (Thanks).
> 
> Photo of the add-on CPS boss (note - no PN in the FA for this):
> 
> http://forums.audiworld.com/s4s6/msgs/231574.phtml
> 
> Here is a photo of the "normal" cast CPS-mounting boss:
> 
> http://forums.audiworld.com/s4s6/msgs/231588.phtml
> 
> This all came up because a fellow in Norway has developed an add-on boss that will
> permit 7A heads to be used with normal AAN CPSs.
> 
> Dave F. ]
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