S3 Turbo 85 (US), Strange Pipes...

[Slav]

Hi,

Was wondering if someone could please help to identify the parts shown by the yellow arrows. I've searched the Workshop manual until my eye went square but could not find what these parts are. I believe the belt driven unit is some kind of a vacuum pump but have no idea what it is used for, some of the pipes were missing when i was taking the car apart. Looks like non of the euro cars have these and the cam is completely blanked off on that side. There is a branched tubed assembly right above the exhaust manifold, anyone know what that is and if its needed? I'm guessing its some sort of a breather? Again the pipe leads to nowhere 🤔

Some help would be much appreciated.

Cheers,

Slav

[skiing]

I believe this is part of the US spec smog equipment to help meet emissions requirements in the US. It injects air driven by the pump as far as I know. 

[Slav]

I see, thanks for the reply. Interesting method of emission's control. 

[CarBuff]

If you remove that stuff (there are other 'surprises' in the LH sail panel), offer it to USA owners, who may need it to pass a visual emissions equipment inspection.

Parts callouts are in Section EM for the air pump version, and EMA for the pulse air injection version.
EM - https://www.rdent.com/manuals/index.html
EMA - https://www.rdent.com/manuals/index.html

 

++++++++++++++

As an aside, those air pumps were common on 70s and 80s carburetted cars of all makes, in the USA. "If the engine can't burn all the fuel, we'll burn it off downstream" 🥴

[Slav]

On 30/11/2020 at 13:14, CarBuff said:

If you remove that stuff (there are other 'surprises' in the LH sail panel), offer it to USA owners, who may need it to pass a visual emissions equipment inspection.

Parts callouts are in Section EM for the air pump version, and EMA for the pulse air injection version.
EM - https://www.rdent.com/manuals/index.html
EMA - https://www.rdent.com/manuals/index.html

 

++++++++++++++

As an aside, those air pumps were common on 70s and 80s carburetted cars of all makes, in the USA. "If the engine can't burn all the fuel, we'll burn it off downstream" 🥴

Cheers for the reply! I cant believe i didn't see your comment come through, thought this thread was done haha. I have the engine out and took the manifold off as well (as part of the restoration) and sort of figured it out from there. Such a crazy system! I've seen all the other paraphernalia stuffed behind the left panel, again was scratching my head for weeks trying to figure out what that was.