Question about engine parts

[peecee69]

I have a couple questions. This is not a picture of my engine - just one I found that looks almost totally stock, which is what I'm trying to get to.

I have a 73 standard that's mostly stock. In trying to get it back on the road, I've replaced a bunch of parts that were either removed or lost in the shuffle of moving. Two items I can't quite figure out are pictured:

1. Is this line from the carb to the airbox fuel line, or something else? I looked on on the oacdp site and can't find the exact type of hose it is.

2. Where does this get connected to under the tin? Is it open to below, or is there something it attaches to? Does it have the same metal sleeve on it that the other two hoses have?

[Braes]

For the 2nd hose you will need to following part :

[Q-Dog]

1) is vacuum hose
http://www.wolfsburgwest.com/cart/DetailsList.cfm?ID=N203751
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'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle

[DuaneL]

line 1 is a vacuum for the flap control on the air filter assembly.
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1971 std bug, 1776, ACN Super Stock 34-3, dvda dist, 27x8.50 14 tires

[wcfvw69]

That photo looks like a 74 engine. The big fresh air hose that runs to the air cleaner is feed from the stove pipe pictured above. It make a huge difference when starting a cold engine, especially in the winter.

Does your engine have it's thermostat and flap assembly in place in the fan shroud?
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[peecee69]

[Tim Donahoe]

At number 1, that vacuum line does is not attached to the carburetor; it's attached to a male nipple that is located on the manifold, just below the left side of the carburetor.

Tim
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[peecee69]

[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 (the first item you asked about) 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 and the second item you asked about) 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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1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor

[beetlenut]

^^^ Very nice explanation, and I learned I am missing my stove pipe!
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[wcfvw69]

[11Bravo]

Great thread for me as well. I have the wrong tin, missing tin, no vacuum hoses to air cleaner and I wont know all the issues til I pull the 72 DP.
I thought I would start on the front suspension, but realizing how much is wrong with the engine cooling that comes first.