RE: Inlet manifold problem/question

[Chris Coracini <Coracin@usdl.com>]

that's interesting because i remember a thread a while back about how some
cars had the air-shroud system and lower insert but DIDN'T have the
air-shroud on the injector.  maybe VW had some overlap in production?
coincidentally, i believe it was an 83 or 84 scirocco...  hmm...

chris
86 16V scirocco


> -----Original Message-----
> From:	T Berk [SMTP:tberk@mindspring.com]
> Sent:	Thursday, March 04, 1999 1:34 PM
> To:	Chris Coracini
> Cc:	'Ewan Hopkins'; scirocco-l@scirocco.org
> Subject:	Re: Inlet manifold problem/question
> 
> Chris,
> 
> This sounds an awful lot like my '84 GTI head I have in my '81. On the
> back of the head is a small rubber hose that joined to the air intake in
> another life. Prior to or after the TB I forget ( I have a premortem
> diagram somewhere ), but it currently is connected to the smaller of the
> two valve cover ports, just because it fit.
> 
> On the back side of the head this rubber hose is connected to a small
> 'plastic' junction that disappears into the head.
> 
> Might this '84 GTI head have an air shrouded injector setup? 
> 
> When I pulled the injectors during the swap and to replace the seals I
> did not notice any extra bits on them, in fact I first had the old 1.6's
> FI in there and they fit all fine. I never bothered to back the
> injectors seat out for inspection.
> 
> tia,
> TBerk
> 
> 
> Chris Coracini wrote:
> > 
> > this sounds awfully close to the way the injectors are set up in the 16V
> > sciroccos.  there is a common air "tunnel" that connects the injectors.
> > this is an "air shrouded" engine.  the air-shroud system consist of an
> extra
> > little cap stuck on the end of each injector with a sealing O-ring.
> this
> > lower O-ring seals against a lower injector insert, also only common to
> this
> > type of engine.  the air passage way connects all the injectors
> > together....somehow...  the purpose is for better atomization of the
> fuel at
> > lower rpms.  i'm 90% sure of it.  yeah, that's the ticket...
> > 
> > chris
> > 86 16V scirocco
> > 
> > > -----Original Message-----
> > > From: Ewan Hopkins [SMTP:ewanhopkins@hotmail.com]
> > > Sent: Thursday, March 04, 1999 10:00 AM
> > > To:   scirocco-l@scirocco.org
> > > Subject:      Inlet manifold problem/question
> > >
> > > This is to anyone who has experience with the type of manifold on the
> > > early audi 2.0L engines, i.e. with injector seats in the manifold and
> > > not in the head.
> > > I have an audi 80 2.0 engine ('92 UK)with this type of head.  There is
> a
> > > channel which links all the injector seats with a hose connector at
> the
> > > TB end of the manifold.  On my engine it is covered with a plug. The
> > > plastic injector seats have holes which appear to allow air flow down
> > > between the seat and the injector, via this common channel.  Just the
> > > other day I saw another audi 80 engine with the same common channel,
> but
> > > in this case there is a hose which plugs in to the bottom of the
> rubber
> > > joint (can't remember what it's called) just before the TB, i.e. it
> > > bypasses the TB.
> > >
> > > Does anyone know what this is supposed to do?  I though I saw
> something
> > > about cooling the injectors but I'm not sure. There is no Haynes
> manual
> > > for that series of Audi so I'm stuck for information about the engine.
> > > I do have a problem with slight pinking if I've been stuck in a
> traffic
> > > queue for a long time, which always goes once I get going again.  I
> > > don't know if maybe this has something to do with that.
> > > I'd appreciate any help on this.
> > >
> > > TIA
> > > Ewan Hopkins...
> > >
> > > '85 Storm 2.0
> > > '86 GT 1.8

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