Oil Bath air filter - early 73 super

[Superbj]

Does anybody have a picture that illustrates the proper hook-ups for an oil bath air filter and an early 73 super? Specifically, I believe I have an original oil bath filter, and I have a 34Pict/3 carburetor. I just installed a SVDA distributor (replaced the 009) so the hook-ups are slightly different and I want to make sure I am doing it right. In my old set-up the vacuum hose on the front (rear facing) of the carburetor hooked up to the oil bath, but instructions indicate this is used when there is a Double VDA distributor. Anyway, it can't be that difficult so if someone has a nice picture I can make sure I get it right.

[67rustavenger]

Here's a 72 oil bath filter, pilfered from vamram's gallery.

You can see the green vacuum hose looped through the left rear filter top clamp.

IIRC, 73 was the first year of the paper filter housings.
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[Superbj]

Where does the rubber vacuum hose (top of air cleaner on right) go to? This is where I think something is incorrect on my original set-up.. I just bought my bug several months ago, this vent was connected to the 34Pict3 port facing the rear of the car. I had my carburetor from Tim at VolkzBitz and he confirmed this port should not be connected/used to anything other than a DVDA distributor. Thus I am not sure where to route that vent to. The manual shows a set-up where this goes to the Vacuum unit on the right side of the air cleaner housing which I suspect is the way the picture you sent me is set-up. This has to be the solution for me. Thanks

[busdaddy]

The air cleaner vacuum connects to the manifold below the carb, the nipple is bent in the pic below, but shows where it should be.

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[lboos]

[Superbj]

yes, that last picture I think is what my set-up should be. When I bought the bug the vacuum hose on the right side, when looking at the engine, was routed into the upper vacuum connection on the Carburetor, which as I understand is for when you have a DVDA distributor only. Thus, I think that was incorrect so am making the correct set-up now. thanks much.

[Superbj]

In fact, that last picture is precisely what my motor looks like, right down to the same air filter, same distributor, etc. This is what I needed to confirm what I thought. I am a rookie at this so just wanted to avoid a dumb a** error.

[lboos]

Here's a pic. of my 71 with a DVDA distributor, the breather is a little diff. as it has no vac. connections on the top.

[sb001]

Basically, it works like this:

The air cleaner has a thermostatic valve in the top of it (#5 in the diagram below), that has two vacuum hoses connected to it (#6). One vacuum hose goes down to the intake manifold below the carburetor (#4.) The other is connected to a vacuum canister (#3) mounted on the snorkel of the air cleaner (#2), which in turn controls a flap inside the snorkel (#1.)

The thermostatic valve is affected by the temperature of the air passing through the air cleaner chamber. When the engine is cold and you start the car, air gets drawn up through the preheat hose (item A in the diagram) from the 1 and 2 cylinders into the air cleaner. (Since the cylinders will heat up this air fairly quickly, it helps warm the engine up more quickly.)
In this condition, with the air passing through the air cleaner fairly cold, the thermostatic valve in the top of the air cleaner is in the OPEN position, which allows the intake below the carburetor to pull vacuum through the top of the air cleaner from the vacuum canister mounted on the air cleaner. AS long as vacuum is being pulled from the canister, it keeps the snorkel flap in the "OPEN TO PREHEATED AIR" position, continuing to allow preheated air from the cylinder banks up through the air cleaner:

However, as that preheated air gradually gets warmer, it starts to push the thermostatic valve at the top of the air cleaner into the CLOSED position. As the valve moves into the closed position, it starts to cut off the vacuum being pulled from the canister on the snorkel, which in turn gradually moves the snorkel flap into the "OPEN TO OUTSIDE AIR" position, until eventually the flap closes off preheated air completely (since the engine is fully warm now, it doesn't need the preheated air anymore) and allows nothing but outisde air through the cleaner:

HTH
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[heimlich]

[volksworld]

the port on the side of the manifold below the carb and the large rearward facing port on the carb itself are both sources of manifold vacuum...the air cleaner would be hooked to the one on the manifold and the retard side of a DVDA would be hooked to the one on the carb...but if you lack the one on your manifold and are running a single advance its perfectly fine to hook your air cleaner to the DVDA port on the carb...

[benntn]

[vamram]

[benntn]

[vamram]

Well, yeah, the engine does. Could be a bad diaphragm. Get the hand-held vacuum pump from HF.
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[talljordan]

Does anyone know the correct temperature for the thermostat to open?
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[benntn]

[benntn]

[passionre]

[talljordan]

Giving it a shot. Im having a lot of trouble dialing mine in. It either is always open or always closed. Does not seem to want to have a happy middleground.
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1972 Super Beetle, Parked until adequate restoration funding is acquired in restoration!

Wanted: Male computer diagnostic plug end