Air filter box operation and ducting

[TONYT25T25]

I have been trying to fathom out if this unit is operating properly.  Currently no 1 pointer goes into the base of the offside rear panel with no further attachments just ends in the void.

No2 pointer has a corrugated tube attached which just dangles down.

No3 pointer has a length of corrugated tube which points to the front of the vehicle and rests just below the air filter box and is open ended.

I gather the unit above no3 is the air regulator.

I have my ideas on how it works but cannot find any description anywhere.  Are there any parts missing, and how do I test if all is functioning correctly ie the air regulator for example. Tks in anticipation Tony.

[Mocki]

The bit you are missing is the not needed heat exchanger part on the original exhaust , where the two cardboard tubes connect and draw warmer air from the exhaust up into the air intakes . Not needed in this climate , indeed , not fitted by Vw for uk vans after 84 ish only for cold climate use . 

most of us just bin it all after the air box .

[TONYT25T25]

Thanks Steve, I found two pipes and clamps left over by the previous exhaust installer which I thought were placed over part of the exhaust pipes where these corrugated tubes would slot over I was going to reintroduce them, so am I correct in thinking that these corrugated tubes are redundant and should be ignored.  Also I was drawn to this area because I thought the engine was running to rich more of a smell than performance and my thinking was not enough air getting into the system, looking at this setup it does not appear to allow/draw a lot of air into the system does it rely on the area I marked as number one which is a bit narrow. How important is the air regulator with these bits now unnecessary does it affect its operation.

[Mocki]

Like I said, generally we bin it off after the box 

here’s a picture of the Just Krappers offering off the early wbx 

[TONYT25T25]

Thanks again, I can see by the diagram where the corrugated pipes would have been connected to.

[TONYT25T25]

Just as an after thought, the part marked no1 goes into the rear pillar/panel below the vent, this was covered by a piece of card where it enters the pillar, this had rotted over the years but I put it back in as best I could, I am now considering removing as it may aid heat from the engine to easier escape via the vent above as the opposite side is completely open, unsure if this would have a negative affect elsewhere in the system.

[Mocki]

It’s water cooled, it doesn’t need to vent engine heat up there , mine is blocked both sides ( heating fuel tank one side, battery the other ) 
the card was to make all the air in there go into the air intake , and cut down on noise . 

 

[TONYT25T25]

Thanks again, more to add to my knowledge base.