non-computer controlled Carter BBD 2 barrel carburetor, Vacuum port identification - JeepForum.com
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Unread 10-03-2008, 05:28 PM   #1
Bell-Vegas
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non-computer controlled Carter BBD 2 barrel carburetor, Vacuum port identification

I need a little help with identifying and connecting the vacuum ports my non-computer controlled Carter BBD 2 barrel carburetor.

The jeep is an 85, stock engine, nuttered, emissions removed, abandoned wires removed, and the above mentioned carburetor.

I am not familiar with a few of the vacuum ports and cannot find the appropriate resources to help me identify them or more importantly what to do with them. Maybe you guys can help. I cannot post pictures so I will provide links to the pictures.

The ports are labeled with numbers in the pictures.

http://flickr.com/photos/7605628@N05/

This is what I came up with so far:

Port 1: Capped
Port 2: To carburetor bowl vent on evaporation canister
Port 3: Connects to distributor, EGR, CTO port, s (2),
Port 4: Connects to Evaporation canister purge can purge, PCV air out
Port 5: ?
Port 6: Connects to TAC system
Port7: Capped (this is not on most carbs that I have seen)
Unlabeled Port: The unlabeled port connects to the choke diaphragm as already shown.

Let me know if these are incorrect or a more appropriate way to connect the carburetor.


Last edited by Bell-Vegas; 10-04-2008 at 01:11 AM..
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Unread 10-04-2008, 10:56 AM   #2
Mike Romain
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Quote:
Originally Posted by Bell-Vegas View Post
I need a little help with identifying and connecting the vacuum ports my non-computer controlled Carter BBD 2 barrel carburetor.

The jeep is an 85, stock engine, nuttered, emissions removed, abandoned wires removed, and the above mentioned carburetor.

I am not familiar with a few of the vacuum ports and cannot find the appropriate resources to help me identify them or more importantly what to do with them. Maybe you guys can help. I cannot post pictures so I will provide links to the pictures.

The ports are labeled with numbers in the pictures.

http://flickr.com/photos/7605628@N05/

This is what I came up with so far:
Port 1: Capped
OK capped, but it is a spark ported port that can be and is on some used to feed the CTO.

Quote:
Port 2: To carburetor bowl vent on evaporation canister
Correct
Quote:
Port 3: Connects to distributor, EGR, CTO port, s (2),
Well.. It 'can' run all those or you can feed the CTO and EGR from the front corner one and just use the side one for the distributor. I would verify the front corner one on yours is ported like mine and only has vacuum at speed, not at idle.

Quote:
Port 4: Connects to Evaporation canister purge can purge, PCV air out
Correct.

Quote:
Port 5: ?
Blocked, it is for some flavor of emissions part, the 85 didn't have this port.

Quote:
Port 6: Connects to TAC system
Correct

Quote:
Port7: Capped (this is not on most carbs that I have seen)
Correct, it is the purge for one flavor of gas tank vent I believe.

Quote:
Unlabeled Port: The unlabeled port connects to the choke diaphragm as already shown.

Let me know if these are incorrect or a more appropriate way to connect the carburetor.
Some comments above.
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Unread 04-23-2012, 09:55 AM   #3
Outnumbered
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Bump for some good info...
2910871044_8fa063793c_z.jpg  
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Unread 04-23-2012, 10:00 AM   #4
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Installing a new charcoal canister today. Can anyone note the difference, if any, in using port #1 to feed the CTO /purge signal thereby allowing the advance to have a dedicated ported source at port #3.

Mike's posts I've found in searches seem to be a little unclear on the success of using this port for the CTO. I was just going to put a vacuum gauge on both to see what the difference is. If they have similar signal I assume they are interchangeable.

I'm trying to avoid T-ing into the dizzy advance line.
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Unread 05-01-2012, 01:38 PM   #5
amir_abbas
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Thanks friends ...
it really helps, but where is it go to?(the tee)

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Unread 05-01-2012, 03:37 PM   #6
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The port identification in that picture is useful but the plumbing (hoses) is not all correct. There should be two vent hoses from the carter BBD that connect with a T and then run to the charcoal canister. That picture does not show them.
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Unread 05-01-2012, 03:43 PM   #7
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Like this...
2514d1268757663-not-carter-carb-064.jpg  
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Unread 05-01-2012, 07:27 PM   #8
86cj74.2L
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This my help if you dont know what the origional setup looked like.

http://home.sprynet.com/~dale02/list.htm
vacuhose.png  
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Unread 05-01-2012, 11:12 PM   #9
amir_abbas
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Quote:
Originally Posted by Outnumbered View Post
The port identification in that picture is useful but the plumbing (hoses) is not all correct. There should be two vent hoses from the carter BBD that connect with a T and then run to the charcoal canister. That picture does not show them.
I think all of the hoses are crrect but as you see the hose joined to the T is not clear.(in the left)


Hose A is going to carburetor bowl vent on evaporation canister and the Carter BBD 2 barrel doesnt have B valve.

I think the T connects port 2 and thsi aprt :

to canister...
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Unread 05-01-2012, 11:21 PM   #10
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Quote:
Originally Posted by amir_abbas View Post
I think all of the hoses are crrect but as you see the hose joined to the T is not clear.(in the left)


Hose A is going to carburetor bowl vent on evaporation canister and the Carter BBD 2 barrel doesnt have B valve.

I think the T connects port 2 and thsi aprt :

to canister...
No, the two vents from the carter BBD (A&B) go direct to the charcoal canister (the BBD DOES have the B fitting/vent). It is shown in pink on the diagram posted above. They do not go to the valve cover/PCV. The yellow oval should connect to the air cleaner/breather filter.
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Unread 05-02-2012, 12:53 AM   #11
amir_abbas
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Thanks ,but still I'm sure that BBD 2 barrel doesn't have the B fitting.
this is mine:
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Unread 05-02-2012, 12:59 AM   #12
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Quote:
Originally Posted by amir_abbas View Post
Thanks ,but still I'm sure that BBD 2 barrel doesn't have the B fitting.
this is mine:
There are variations of the BBD. That is unlike any US Jeep/CJ BBD I have seen. All BBD's I've seen here in the states have 2 breather ports. Possibly it is a European variation you have? Or maybe a BBD from another Dodge or AMC vehicle? I see you are in the middle east. Where did your Jeep come from. Regardless, that vent goes straight to the charcoal canister. No need to T to the valve cover. It is a vent, not a vacuum port.
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Unread 05-02-2012, 01:00 AM   #13
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Also, if you fill out your profile it would help people help you. Tell us what year, model, etc your jeep is.
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Unread 05-02-2012, 09:15 AM   #14
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Thank you dear friend ...

Last edited by amir_abbas; 05-02-2012 at 10:50 AM..
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