Moparts
TA/AAR Two-Nipple Crankcase Breather
Posted By: floyd
TA/AAR Two-Nipple Crankcase Breather - 02/17/10 11:53 PM
I know there have been posts on this before but my favorite posts are no longer showing up. Does anyone have a picture of an original 2-nipple breather from a T/A or AAR? I have one new in the box, part number 3462095, but the smaller tube has a much smaller diameter than the carb bowl-vent tube that it connects to. Is that right?
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 12:06 AM
For the AARs & T/As;
Single nipple for most.
Triple nipple for cars with N95.
Dual nipple for none.
Posted By: floyd
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 12:12 AM
Barry - Where did the bowl vent on the center carb go then?
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 12:14 AM
It just stayed open on the non-N95 cars.
Posted By: fastmark
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 12:22 AM
Where did the other vent on the breather go then?
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 12:22 AM
See item 8 on this TSB page, it is about AAR Cuda maintenance;
http://www.hamtramck-historical.com/images/TSBs/1970/70-25-7%20page14.jpgNote that the words 'hose' & 'nipple' are singular.
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 12:33 AM
Quote:
part number 3462095
The 1970-71 parts book shows that one is for 1970 & '71 six cylinder cars.
The part number for the 340-6 cars is 3462 096
Posted By: DAYCLONA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 01:08 AM
Quote:
It just stayed open on the non-N95 cars.
Barry I just can't see the factory leaving the bowl vent tube open 
.....potential fire source should the needle seat stay open, which happens, the earlier year center carb design with the "open" bowl vent, still has a "rubber hat" to seal some what should a high flow/over flow condition exsist,...why put a 3 nipple breather on a car if your using only 2 ports
Posted By: PAULS_340
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 01:20 AM
single tube
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 01:48 AM
Look at that drawing closer - it is G-series (1971) for the cars that never came to be.
Apples & oranges.
The vents were open on 1970 non-N95 cars.
Posted By: DAYCLONA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 02:58 AM
Quote:
Look at that drawing closer - it is G-series (1971) for the cars that never came to be.
Apples & oranges.
The vents were open on 1970 non-N95 cars.
Oh,...I more than know it's a "G" series drawing,......but
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 03:08 AM
Troy's T/A (pictured) is an N95 car.
Posted By: DAYCLONA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 03:11 AM
Quote:
Troy's T/A (pictured) is an N95 car.
Opps!...OK 
Posted By: Troy
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 06:04 AM
Hi Barry, hope all is well. Yes, my car is a N95 car.
Posted By: fastmark
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 06:13 AM
Back to the original question. Does anyone have a pic of an original breather. Let me get this straight. Even though the breather had two nipples, the smaller of the two was open as so was the hose from the carb. Where the two nipples both the same size so a hose could fit between them if desired?
Posted By: BJohnson
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 06:27 AM
N95
Posted By: BJohnson
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 06:28 AM
Federal
Posted By: ademon
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 06:37 AM
Posted By: floyd
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 02:22 PM
I've been going through my pics. The purple survivor T/A that was at the Nats two years ago looks like it had a section of rubber hose coming off the carb bowl vent that wasn't connected to anything. It had the single nipple breather. I'll post a pic when I get home this afternoon. Barry - How about the Yellow T/A?
Posted By: Anonymous
Post deleted by moparts - 02/18/10 02:59 PM
Posted By: floyd
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 07:32 PM
Here's the pic from the survivor purple T/A
Posted By: DAYCLONA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/18/10 11:25 PM
Quote:
Here's the pic from the survivor purple T/A
Wow,...just a hose dumping out to nowhere?,....looks like a potential fire hazard by dumping gas right on the exhaust manifold should the needle seat stick on the center carb,....Chrysler wasn't concerned about this application? 
Posted By: Steve340
Re: TA/AAR Two-Nipple Crankcase Breather - 02/19/10 12:58 AM
It would have no more gas dumping than the rubber hat top fuel bowl where it would just run down the side of the bowl.
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/19/10 01:32 AM
Would having gas run into the crankcase be a better situation?
KABOOM!
The low mile T/A has a single nipple breather AND it was pushed into the valve cover while the engine paint was still wet, note the orange engine paint stuck to the underside.
Posted By: rftroy
Re: TA/AAR Two-Nipple Crankcase Breather - 02/19/10 02:33 AM
As Barry said, there were no two nipple breathers.
The Chrysler name for the part is Crankcase Vent Inlet Air Cleaner and Oil Filter, although the service manuals referred to it variously as a breather cap, or a crankcase air cleaner.
Attached is the page from a 1970 parts book. This is a May 1970 revision, which includes AAR and T/A.
Only 3 breathers were made. One for all cars without the 1970 emission control system (ECS) - one nipple, one for V8's w/ECS - 3 nipples, and one for slant sixes w/ECS.
The purple T/A has the wrong breather.
Bob
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 02/19/10 02:48 AM
Quote:
The purple survivor T/A that was at the Nats two years ago looks like it had a section of rubber hose coming off the carb bowl vent that wasn't connected to anything. It had the single nipple breather.
From his post earlier, the hose just ends, does not go to a nipple.
Posted By: rftroy
Re: TA/AAR Two-Nipple Crankcase Breather - 02/19/10 04:12 AM
Quote:
Quote:
The purple survivor T/A that was at the Nats two years ago looks like it had a section of rubber hose coming off the carb bowl vent that wasn't connected to anything. It had the single nipple breather.
From his post earlier, the hose just ends, does not go to a nipple.
Oh, you're right. My brain saw the hose attached to the breather, but it now looks like an open hose end.
Bob
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 04:04 PM
This pic is from the mag Super Stock July 1970. It shows a vent hose to the breather and there is no pipe comming up for N95 on the fender well so it's a 2 nipple breather. I have the mag if anyone wants to see the whole artical. Download the pic and enlarge it.
.jpg "5842712-carbvent(Medium).jpg")
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 04:18 PM
This mag is High Performance Cars Aug 1970. It's pretty clear this engine only has 2 nipples in the breather. As before I have this mag also if anyone needs more proof.
.jpg "5842735-carbvent(Medium).jpg")
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 04:27 PM
For those who don't believe the magazines don't exist.
.JPG "5842756-MagPic(Medium).JPG")
Posted By: jeff968
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 04:27 PM
All my T/As, and I've owned 5 of them since 1978, have had the single large nipple breather as Barry said.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 04:37 PM
I don't know for sure...all I'm offering is proof from the 70's that they did exist. I very well dought the people shooting these pictures in the 70's added the hose and different breather. Why would they care which one the car had? May be it was a hit or miss rather they used 1 or 2 nipple breather on the line. Who was standing there and can say for sure.
Posted By: autoxcuda
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 05:22 PM
Quote:
This mag is High Performance Cars Aug 1970. It's pretty clear this engine only has 2 nipples in the breather. As before I have this mag also if anyone needs more proof.
Looks like three nipples to me. The small one is just disconnected. It's pointed toward the camera and just to the right of the heater hoses. In that picture, the one going to the air cleaner is at the 2 o'clock position, and the one going to the carb is at the 11 o'clock position. Please correct me if I'm seeing this wrong.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 06:48 PM
This is that cap at 3000 PPI's. I only see 2 nipples on it. The thing at 6 O'Clock that may look like the third is the bend on the heater hose holder. That's what I see.
.jpg "5843003-carbvent3000(Medium).jpg")
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 08:43 PM
The third nipple is in that photo, but it is in the shadowed area.
It has come up before.
If you take a 3-nipple breather & hold it at the same angle / orientation you can spot it, try it.
Posted By: hemi70se
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 09:43 PM
Here is a pic of a new 1970 440 6 pack Chall as tested in a March 1970 Road Test magazine. It clearly shows a 2 nipple breather and it definitely does not have the N95 emission vent line.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 11:01 PM
Quote:
The third nipple is in that photo, but it is in the shadowed area.
It has come up before.
If you take a 3-nipple breather & hold it at the same angle / orientation you can spot it, try it.
If that is the case then where is the third hose and pipe coming from the fender well? It's not in the whole engine picture from above. By looking at Troys engine pic it would have to be hanging out to wards the engine.
Posted By: 70AARcuda
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 11:12 PM
Bought my AAR in July 73 and it has a single nibble breather.. It was originally sold in the Atlanta area.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 11:27 PM
This is a very good discussion we have here. If someone would have a picture from the 70's of an original T/A or AAR with a vent tube center carb with a 1 nipple breather I would be a believer. As of now all I have is my 1970's car magazines with pictures showing otherwise. I find it hard to believe the factory would just let gas vent out on a hot intake. I guess we are not going to convince each other one way or another.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/03/10 11:46 PM
I just had another thought. (WOW that's scary) Why would they vent the carb to the breather on an N95 car and just let it go and vent to the air on a regular T/A? As I understand the N95 was to recirculate the gas tank vapor so it didn't go in the air. Why not just vent it up to the breather and leave it at that? I guess my other question is why the double standard?
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:13 AM
Quote:
Quote:
The third nipple is in that photo, but it is in the shadowed area.
It has come up before.
If you take a 3-nipple breather & hold it at the same angle / orientation you can spot it, try it.
If that is the case then where is the third hose and pipe coming from the fender well? It's not in the whole engine picture from above. By looking at Troys engine pic it would have to be hanging out to wards the engine.
The steel line would be out of view in the magazine photo. Here is a N95 T/A line.
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:16 AM
Quote:
Here is a pic of a new 1970 440 6 pack Chall as tested in a March 1970 Road Test magazine. It clearly shows a 2 nipple breather and it definitely does not have the N95 emission vent line.
What is that running from the breather across the heater motor to the fender then?
Posted By: ademon
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:17 AM
May be a pilot, or a factory ringer in those mags. Saw a old demon 340 road/track mag write up where it had odd stripes that didn't make it into production
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:20 AM
Quote:
Quote:
Here is a pic of a new 1970 440 6 pack Chall as tested in a March 1970 Road Test magazine. It clearly shows a 2 nipple breather and it definitely does not have the N95 emission vent line.
Here is Troys pic. the pipe hangs way over the heater hoses. Going by this it should be some ware in the 70's photo don't you think? Even if the pipe isn't visible The hose should be still hanging out there.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:21 AM
Quote:
May be a pilot, or a factory ringer in those mags. Saw a old demon 340 road/track mag write up where it had odd stripes that didn't make it into production
Now that I could buy. I had never thought of it.
Posted By: floyd
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:22 AM
Quote:
Quote:
Here is a pic of a new 1970 440 6 pack Chall as tested in a March 1970 Road Test magazine. It clearly shows a 2 nipple breather and it definitely does not have the N95 emission vent line.
What is that running from the breather across the heater motor to the fender then?
Barry - I don't think that breather matches a 3-nipple based on a comparison to this pic. You should be able to see the "superfluous 3rd nipple"
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:25 AM
Quote:
I just had another thought. (WOW that's scary) Why would they vent the carb to the breather on an N95 car and just let it go and vent to the air on a regular T/A? As I understand the N95 was to recirculate the gas tank vapor so it didn't go in the air. Why not just vent it up to the breather and leave it at that? I guess my other question is why the double standard?
How the 1970 N95 system worked at the links below.
http://www.hamtramck-historical.com/images/serviceHighlights/70%20sh%20125.jpg
http://www.hamtramck-historical.com/images/serviceHighlights/70%20sh%20126.jpg
http://www.hamtramck-historical.com/images/serviceHighlights/70%20sh%20127.jpg
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:27 AM
Quote:
Barry - I don't think that breather matches a 3-nipple based on a comparison to this pic. You should be able to see the "superfluous 3rd nipple"
It sticks out like a 440-6 in a 340-6 discussion.
Posted By: floyd
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:32 AM
All this talk of nipples got me thinkin'. Time to shave....
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:33 AM
I just spit up on my desk!!!!!!!!!! HAHAHAHAHA!
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:37 AM
Looking at this closeup I cannot see where you see a third (OK) fitting for the tank vent. I do have an appointment to get new glasses but I still don't see it.
.jpg "5843648-carbvent3000(Medium).jpg")
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 12:20 PM
Maybe I'm just the stubbern German in me but I don't see why they would have this system for California and just let the carb vent into the open air for the rest on the states. They got rid of the crankcase open vents in the 60's and went to a PCV system so why let the carb vent open?
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 03:44 PM
Here is a picture from the last page of the artical. It has the air cleaner on and there is NO N95 vent going to the breather. I'm listing all the pages to the Magazine. Anyone car read it for them selfs.
Pg1
http://96.18.66.248/images/HPC%20AUG%2070%2001.jpgPg2
http://96.18.66.248/images/HPC%20AUG%2070%2002.jpgPg3
http://96.18.66.248/images/HPC%20AUG%2070%2003.jpgPg4
http://96.18.66.248/images/HPC%20AUG%2070%2004.jpgPg5
http://96.18.66.248/images/HPC%20AUG%2070%2005.jpgJust download the pages and enlarge them and they will be readable. I know I'm not going to make those that believe the vent tube was left open think otherwise. As far as I'm conserned it wasn't and to me this artical and the Super Stock magazine of July 1970 both shows the vent going to the a 2 nipple breather.
I rest my case!
.jpg "5844713-carbvent02(Medium).jpg")
Posted By: hemi70se
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 04:22 PM
Quote:
Quote:
Here is a pic of a new 1970 440 6 pack Chall as tested in a March 1970 Road Test magazine. It clearly shows a 2 nipple breather and it definitely does not have the N95 emission vent line.
What is that running from the breather across the heater motor to the fender then?
That is the windshield washer hose. It's much smaller. I figured that would taken as vent hose.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 04:50 PM
hemi70se
It looks like you and I are out on a limb alone on this. Until someone can come up with photos from the 70's showing the vent was just left open I'm going to rely on the two magazine articles I can produce to show it wasn't.
I went back and reread the two articles thinking that maybe they were the same car. They were not. One of the cars had 3:91's and the other has 3:55's. The articles were 2 months apart and two different cars.
Posted By: hemi70se
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 05:14 PM
Here is a pic of my N95 equipped 70 Cuda taken at the same pic angle as the 70 Road Test Challenger. There is no way that that vent line is not going to show up in that pic. That Chall just didn't have the N95 line, but clearly it has the vent line to the carb bowl.
Posted By: hemi70se
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 05:25 PM
Notice how the vent line to the carb on my Cuda comes out at the upper part of the breather. The pic of the Chall has it coming out at the lower part. Here is a pic of an NOS 2 port breather and it matches the Chall's breather with port locations. How can you dispute pics of new cars? To me there are the best example of how these cars were built and the best guide for resto.
Posted By: hemi70se
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 06:03 PM
Here is a pic of a NEW TA Chall as featured in "High Performance Cars back in Nov '70. It clearly shows a single port breather and an open carb vent tube. It does have some mods like headers and progressive throttle linkage but I think you can safely assume the carbs and breather are original. As a side note, this is a great feature as it shows a RARE color pic of the lime green TA with the hood open and it is plainly visible that it has a yellow cap battery.
Posted By: BS27ROB
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 06:10 PM
While you are probably right about the breather, things have been changed. Note the PCV port has been blocked off and the hose from the PCV valve routed down the front of the engine.
Posted By: RareTA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/04/10 08:18 PM
I have that magazine also. That car is highly modified for racing. There isn't much OEM on that motor. If you read the caption of the picture it says the engine has been blueprinted for drag racing. How many OEM parts got put back on? This is far from a stock showroom engine bay.
http://96.18.66.248/images/HPC02%20(Large).jpghttp://96.18.66.248/images/HPC04%20(Large).jpg
Posted By: floyd
Re: TA/AAR Two-Nipple Crankcase Breather - 03/06/10 05:18 PM
I checked with the owner of the survivor (one-owner) plum crazy T/A. He said his car has the original single-nipple breather and the center carb bowl vents to the atmosphere. I believe his carb came with a short piece of hose off the bowl vent (several inches long). I've asked him to take a close-up pic and I'll post it when I get it. That's pretty solid info for me since his car was built the same day as mine and our VINs are very close.
That said, I'll probably run a 2-nipple on the car IF I ever get it done.
Posted By: SYDWAZ
Re: TA/AAR Two-Nipple Crankcase Breather - 03/08/10 04:08 AM
I am the original owner of an AAR. It has 42K and is unrestored. As Barry said mine has the open vent to the atmosphere and a single large spigot on the crankcase vent.
Posted By: Troy
Re: TA/AAR Two-Nipple Crankcase Breather - 03/08/10 06:48 AM
This topic keeps coming up over and over again and I don't know if there is a real good answer. There is truth to both sides of the story.
Here is a strange one for everybody and I don't know if even Barry can even answer it. I came across a old T/A sitting in a field and this is the breather that was on this car.....
Posted By: ademon
Re: TA/AAR Two-Nipple Crankcase Breather - 03/08/10 07:25 AM
thats the correct breather for the T/A motors with the cross bolt mains
Posted By: A0M397X
Re: TA/AAR Two-Nipple Crankcase Breather - 03/08/10 12:57 PM
Great disscusion. The only thing I can add is that many cars had open bowl vents in this time period. Most of my cars are AMC and all have atmospheric vents without any plumbing.
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 03/08/10 06:01 PM
Quote:
This topic keeps coming up over and over again and I don't know if there is a real good answer. There is truth to both sides of the story.
Here is a strange one for everybody and I don't know if even Barry can even answer it. I came across a old T/A sitting in a field and this is the breather that was on this car.....
Some guy in CA got bored & made that one. 
Posted By: bogusracer
Re: TA/AAR Two-Nipple Crankcase Breather - 03/09/10 11:02 AM
Quote:
Quote:
This topic keeps coming up over and over again and I don't know if there is a real good answer. There is truth to both sides of the story.
Here is a strange one for everybody and I don't know if even Barry can even answer it. I came across a old T/A sitting in a field and this is the breather that was on this car.....
Some guy in CA got bored & made that one.
Made in CA. for breathing something more than fumes from a "Crank" Case. LOL
Posted By: aarcuda
Re: TA/AAR Two-Nipple Crankcase Breather - 03/09/10 06:08 PM
i just cap mine off. I dont need gas flooding onto the engine. had that happen on my truck once and WHOOOOOSH! it caught fire lickity split.
The holley 2 bbl 2300 has a fuel bowl vent already built in. it vents thru the hole in the front center of the air horn.
Posted By: Troy
Re: TA/AAR Two-Nipple Crankcase Breather - 03/09/10 08:19 PM
If you cap it off at the carb you could get a high speed miss. You can starve the engine for fuel at the top end.
Posted By: 72roadrunnergtx
Re: TA/AAR Two-Nipple Crankcase Breather - 03/09/10 08:42 PM
Quote:
If you cap it off at the carb you could get a high speed miss. You can starve the engine for fuel at the top end.
The center carb external fuel bowl vent line nipple? The enclosed vent valve is closed off at any throttle position other than idle and off-idle. Plugging it off will have no effect high speed fuel mixtures. It is intended to be vented to the atmosphere if not plumbed to the breather cap or a charcoal canister however.
Posted By: aarcuda
Re: TA/AAR Two-Nipple Crankcase Breather - 03/10/10 06:23 PM
Quote:
If you cap it off at the carb you could get a high speed miss. You can starve the engine for fuel at the top end.
the end carbs operate without a similar valved external vent. the end carbs only have the tube in the center of the air horn.... why wouldnt they need the same type of vent as the center carb?
and ya, doesnt the valved vent only open at idle and close when you give it gas???
Posted By: aarcuda
Re: TA/AAR Two-Nipple Crankcase Breather - 03/10/10 06:28 PM
btw, there are TONS of holley carbs that do not have this valved vent line on them. the majority of 4bbl holley carbs just use the vent that is in the air horn.
why would a six pack carb need a special vent for the center? doesnt make sense. should operate the same as any old run of the mill holly 44bl
Posted By: 72roadrunnergtx
Re: TA/AAR Two-Nipple Crankcase Breather - 03/10/10 07:43 PM
Quote:
btw, there are TONS of holley carbs that do not have this valved vent line on them. the majority of 4bbl holley carbs just use the vent that is in the air horn.
why would a six pack carb need a special vent for the center? doesnt make sense. should operate the same as any old run of the mill holly 44bl
Every Mopar OEM Holley, including the early center six-pack carbs, has had an external fuel bowl vent valve of some sorts, either a small rubber “hat” over a hole or the later enclosed valve and nipple (E.C.S.) It is not intended to be/or replace the primary balanced bowl vent. On a street application it’s purpose is to provide, external to the air cleaner, another bowl vent path to atmospheric pressure thus ensuring, under hot at rest conditions, that pressures above the fuel can’t build during heat soak. Competition applications usually don’t have the same concerns and therefore carbs built for that purpose don’t have them. Aftermarket carburetors, including those from Holley, I’ve purchased over the years, designed for street/street-strip use, all had an external enclosed bowl vent valve. If not running an evaporative recovery system of some kind it is to be left open.
Blocking off or eliminating the external vent valve system will not alter the running performance at all in most cases, may contribute to hard starting hot however under curtain street use conditions.
Posted By: aarcuda
Re: TA/AAR Two-Nipple Crankcase Breather - 03/11/10 02:23 AM
Quote:
Quote:
btw, there are TONS of holley carbs that do not have this valved vent line on them. the majority of 4bbl holley carbs just use the vent that is in the air horn.
why would a six pack carb need a special vent for the center? doesnt make sense. should operate the same as any old run of the mill holly 44bl
Every Mopar OEM Holley, including the early center six-pack carbs, has had an external fuel bowl vent valve of some sorts, either a small rubber “hat” over a hole or the later enclosed valve and nipple (E.C.S.) It is not intended to be/or replace the primary balanced bowl vent. On a street application it’s purpose is to provide, external to the air cleaner, another bowl vent path to atmospheric pressure thus ensuring, under hot at rest conditions, that pressures above the fuel can’t build during heat soak. Competition applications usually don’t have the same concerns and therefore carbs built for that purpose don’t have them. Aftermarket carburetors, including those from Holley, I’ve purchased over the years, designed for street/street-strip use, all had an external enclosed bowl vent valve. If not running an evaporative recovery system of some kind it is to be left open.
Blocking off or eliminating the external vent valve system will not alter the running performance at all in most cases, may contribute to hard starting hot however under curtain street use conditions.
i can believe that. i was responding to the post that said the valved external vent was needed to prevent a high speed miss.
I know i have mine blocked off AND when its hot out side, and the engine is hot and has been sitting for 15 to 20 minutes, it doesnt like to start and sometimes spews gas out of the vent in the airhorn. now i know why
Posted By: 70gtx440dana
Re: TA/AAR Two-Nipple Crankcase Breather - 11/11/21 06:06 PM
Reviving this very old thread. Any idea what application this style 2 nipple breather was used on. Not familiar wit this style. Most of the 2 nipple breathers I have seen have a smaller nipple located toward the bottom. Could this design have shown up on some of the 340 & 440 6 pack applications?
Posted By: Mastershake340
Re: TA/AAR Two-Nipple Crankcase Breather - 11/11/21 06:41 PM
Barry’s reply to the original post in this thread still holds. 6 packs got one nipple or three nipple depending on the emission package the car was built with.
I bought an NOS 2 nipple years ago when I was gathering parts for my T/A thinking it was correct for my car.
After I found it wasn’t, I found it was only correct for something not very exciting, like maybe slant sixes. After a number of years trying to sell it, I finally found a buyer for my NOS cap, got $25 for it iirc.
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 11/11/21 09:38 PM
I'll just leave this image right here......
Description: 1970
Posted By: 70gtx440dana
Re: TA/AAR Two-Nipple Crankcase Breather - 11/11/21 09:42 PM
I'll just leave this image right here......
Thanks Barry...any idea what the breather in the above photos I attached was used for? I see the 2 port breathers shown in your photo all over the place. Have not seen this one before.
Posted By: Alaskan_TA
Re: TA/AAR Two-Nipple Crankcase Breather - 11/11/21 10:00 PM
What I showed above was for the first model year this type was used, with the lower 2nd nipple location.
Yours may be from a later model year?
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