Inlet manifold problem/question

["Ewan Hopkins" <ewanhopkins@hotmail.com>]

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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