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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: Troy]
#616041
03/08/10 02:01 PM
03/08/10 02:01 PM
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Joined: Jan 2003
Posts: 29,654
Hamtramck, PA
Alaskan_TA
Fluffy Balladeer
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Fluffy Balladeer
Joined: Jan 2003
Posts: 29,654
Hamtramck, PA
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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. 
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: Alaskan_TA]
#616042
03/09/10 07:02 AM
03/09/10 07:02 AM
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Joined: Dec 2003
Posts: 306
Texas
bogusracer
enthusiast
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enthusiast
Joined: Dec 2003
Posts: 306
Texas
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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
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: bogusracer]
#616043
03/09/10 02:08 PM
03/09/10 02:08 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,491
the boonies
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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.
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: aarcuda]
#616044
03/09/10 04:19 PM
03/09/10 04:19 PM
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Joined: Dec 2003
Posts: 3,957
West Coast, CA
Troy
master
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master
Joined: Dec 2003
Posts: 3,957
West Coast, CA
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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.
....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: Troy]
#616045
03/09/10 04:42 PM
03/09/10 04:42 PM
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Joined: Oct 2008
Posts: 765
Shoreline, Washington
72roadrunnergtx
super stock
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super stock
Joined: Oct 2008
Posts: 765
Shoreline, Washington
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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.
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: aarcuda]
#616047
03/10/10 02:28 PM
03/10/10 02:28 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,491
the boonies
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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
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: aarcuda]
#616048
03/10/10 03:43 PM
03/10/10 03:43 PM
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Joined: Oct 2008
Posts: 765
Shoreline, Washington
72roadrunnergtx
super stock
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super stock
Joined: Oct 2008
Posts: 765
Shoreline, Washington
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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.
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: 72roadrunnergtx]
#616049
03/10/10 10:23 PM
03/10/10 10:23 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,491
the boonies
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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
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: aarcuda]
#2984127
11/11/21 02:06 PM
11/11/21 02:06 PM
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Joined: Dec 2003
Posts: 3,524
Lansing, MI
70gtx440dana
master
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master
Joined: Dec 2003
Posts: 3,524
Lansing, MI
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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?
70 Road Runner 383-4 4 speed FJ5 & black guts
70 Charger R/T 440-4 4 speed FJ5 & white guts
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Re: TA/AAR Two-Nipple Crankcase Breather
[Re: Alaskan_TA]
#2984209
11/11/21 05:42 PM
11/11/21 05:42 PM
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Joined: Dec 2003
Posts: 3,524
Lansing, MI
70gtx440dana
master
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master
Joined: Dec 2003
Posts: 3,524
Lansing, MI
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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.
70 Road Runner 383-4 4 speed FJ5 & black guts
70 Charger R/T 440-4 4 speed FJ5 & white guts
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