72' Type 4 Oil Bath Air Cleaner, Warm air Air Intake Hoses Options

[Ishley]

After 2 years of work....I've completed my '72 restoration...but one thing has me stymied.

I have an oil bath air filter... (pictured) and it has 2 air input points... one is a plastic goose neck and the other is a hose connection controlled by a vacuum system. The mysterious hose I think is supposed to run over to a connection point added to the engine tin...into a "hot air riser". I have no such connection point. I thought my motor was the original 1.7.... which I've now rebuilt into a 2056. I do not have a hot air riser tube.

The only place I've ever spotted a 72 with this type of a air cleaner is on a YouTube video of an original 72. https://youtu.be/w-c6Deg3fBU?si=FPjt3Fhg0lqMsaad Spotted at around 11:20 of this video. The video doesn't show where this hose terminates... but I assume into the mysterious "Hot Air Riser".

I also see in the PET diagrams they show this tube which would bolt to the engine tin behind the cylinder one location. I see a few ebay listings for this tube... but I've never seen it on any of the engines I've looked at.

Does anyone have insight into a hot air riser system.... that bolts to the engine tin behind cylinder one? I don't really think I need it... as this is really a summer only car... but I hate having this unknown empty input point on my air cleaner staring me in the face every time I pop the engine lid.

[Ishley]

I found a 73 air cleaner on EBay and ordered it. Looks original.

My 72 intake had been painted blue… yuk. The PO must of loved blue… there were a bunch of parts painted ford engine blue. And someone spray a coat of single stage silver in the engine bay over everything else. What a mess. All the wiring… hoses… lots and lots of time cooking and cleaning parts in my ultra sonic cleaner.

The DJet does have an air temp sensor in the intake Plenum. There is another temp sensor which sits on top of the engine… And of course a head temp sensor. I installed a 123 distributor and it also senses and reports temp.

[wonkipop]

I found a 73 air cleaner on EBay and ordered it. Looks original.

My 72 intake had been painted blue… yuk. The PO must of loved blue… there were a bunch of parts painted ford engine blue. And someone spray a coat of single stage silver in the engine bay over everything else. What a mess. All the wiring… hoses… lots and lots of time cooking and cleaning parts in my ultra sonic cleaner.

The DJet does have an air temp sensor in the intake Plenum. There is another temp sensor which sits on top of the engine… And of course a head temp sensor. I installed a 123 distributor and it also senses and reports temp.

yes, they are a curiosity those preheat pipes.
the dim recesses of my memory tell me that the squarebacks (or type 3 generally) had that pre heat hook up to the aircleaner intake on the later type 3 only. the ones that had the longer nose update from whenever is was 1970 i think. i seem to remember the older type 3 did not have it or the hookup to the heat exchanger or wherever it was that it went down under or near the fan.
and these were all carb cars down here in aus. very rare to have EFI type down here.

it seemed to be something VW were doing around that time for some reason.

and they must have decided the type 4 engine needed it too. at least for a short period of time. can't think why it would be when you have EFI. because i don't think the first 914/4s had it. whatever it was it was a blip on the radar.

i think the later beetles down here like the super beetles (which were carb here) also had that heat pipe additional stuff to the air cleaner too. and it can't be about winter conditions down here because............we don't have a winter really. its a slightly cooler 3 month period down here with a quaint european name.