Re: 70 T/A carb hose routing question
[Re: Alaskan_TA]
#2536550
08/15/18 01:13 AM
08/15/18 01:13 AM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
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master
Joined: Mar 2008
Posts: 9,550
Sacramento CA
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Vent open except when coded N95.
If it has N95, hose to a nipple on the three nipple valve cover breather. Barry I think you got that one wrong. If it's a N95 it goes to a 3 nipple breather If it's NOT a N95 it goes to a 2 nipple breather There are no CA 340 SIXPACK carbs
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Re: 70 T/A carb hose routing question
[Re: Mastershake340]
#2536563
08/15/18 01:56 AM
08/15/18 01:56 AM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
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master
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Sacramento CA
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N95 got a 3 nipple, the rest got a single nipple breather. The hose from the large outlet on the breather is connected to a tube on the air cleaner base. This is my car with a single nipple breather and a picture I saved of a member's N95 car. Shake Where does your bowl vent go?
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Re: 70 T/A carb hose routing question
[Re: Mastershake340]
#2536574
08/15/18 02:44 AM
08/15/18 02:44 AM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
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I Live Here
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Vents to atmosphere. No hose. Agreed, vents to atmosphere, but never liked that on any of my sixpack cars, I always capped the bowl vent tube, no need to have a possible fuel leak/fire that could have been avoided...
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Re: 70 T/A carb hose routing question
[Re: Morty426]
#2536594
08/15/18 08:24 AM
08/15/18 08:24 AM
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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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If it's NOT a N95 it goes to a 2 nipple breather The two nipple breather for 1970 has one application - /6 engines with N95.
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Re: 70 T/A carb hose routing question
[Re: SKR8PN]
#2536595
08/15/18 08:27 AM
08/15/18 08:27 AM
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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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No 3 nipple on the valve cover and yes on the color as well as an automatic. Will check the code..... N94 is the Trans Am package. No N95 present, so you need a single nipple breather connected to the air cleaner base & leave the vent open to be factory correct.
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Re: 70 T/A carb hose routing question
[Re: tman]
#2536767
08/15/18 02:44 PM
08/15/18 02:44 PM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
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Sacramento CA
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Does this info apply to 1970 440-6 ebody? Yes and no. The non-California center carb does not have a nipple on it, it has a bowl vent. So non-CA uses a single nipple breather and CA the 3 nipple breather
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Re: 70 T/A carb hose routing question
[Re: SKR8PN]
#2536771
08/15/18 02:51 PM
08/15/18 02:51 PM
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Joined: Jan 2003
Posts: 8,028 The Grand State of Confusion-O...
SKR8PN
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OP
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Thanks tons for the info and the pictures. This car is soooo nice that I am going to also plug the bowl vent with a black, fuel capable plug and not that red vacuum plug. I am also very nervous about just letting it vent to atmosphere. I will just be sure to show the owner what I did and why.
I am replacing the center carb for one with the correct numbers. The one that was on the car was for a 4 speed car. Also, whoever installed these carbs was a hack. He had screwed up the flare nut on the rear line right at the carb inlet so bad that I had to make a replacement line. It looked like he installed it with a pipe wrench. :0
Karma has no menu. You get served what you deserve.
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Re: 70 T/A carb hose routing question
[Re: SKR8PN]
#2536993
08/16/18 01:07 AM
08/16/18 01:07 AM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
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master
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Sacramento CA
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Thanks tons for the info and the pictures. This car is soooo nice that I am going to also plug the bowl vent with a black, fuel capable plug and not that red vacuum plug. I am also very nervous about just letting it vent to atmosphere. I will just be sure to show the owner what I did and why.
I am replacing the center carb for one with the correct numbers. The one that was on the car was for a 4 speed car. Also, whoever installed these carbs was a hack. He had screwed up the flare nut on the rear line right at the carb inlet so bad that I had to make a replacement line. It looked like he installed it with a pipe wrench. :0 Hey the factory had that bowl vent to atmosphere for a reason - I would not put a plug on it
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Re: 70 T/A carb hose routing question
[Re: Morty426]
#2537033
08/16/18 07:21 AM
08/16/18 07:21 AM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
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I Live Here
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Hey the factory had that bowl vent to atmosphere for a reason - I would not put a plug on it
I've been plugging (capping) the vent (tube style)for decades, dosen't effect operation/performance.... Mike
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Re: 70 T/A carb hose routing question
[Re: NANKET]
#2537034
08/16/18 07:25 AM
08/16/18 07:25 AM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
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I Live Here
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Nervous? Fuel leak? How do you plug the bowl vent on a 440-6 non N95 with the flapper valve? Use a solid push in rubber plug/remove the flapper and linkage arm if desired...
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Re: 70 T/A carb hose routing question
[Re: DAYCLONA]
#2537100
08/16/18 11:48 AM
08/16/18 11:48 AM
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Joined: Mar 2008
Posts: 9,550 Sacramento CA
Morty426
master
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master
Joined: Mar 2008
Posts: 9,550
Sacramento CA
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Nervous? Fuel leak? How do you plug the bowl vent on a 440-6 non N95 with the flapper valve? Use a solid push in rubber plug/remove the flapper and linkage arm if desired... Why bother?
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Re: 70 T/A carb hose routing question
[Re: Morty426]
#2537185
08/16/18 02:31 PM
08/16/18 02:31 PM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Nervous? Fuel leak? How do you plug the bowl vent on a 440-6 non N95 with the flapper valve? Use a solid push in rubber plug/remove the flapper and linkage arm if desired... Why bother? ...
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Re: 70 T/A carb hose routing question
[Re: SKR8PN]
#2538062
08/18/18 11:49 AM
08/18/18 11:49 AM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
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top fuel
Joined: Feb 2010
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Phila. Pa.
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All three carbs have a bowl vent in the standard location, cast into the rear of the air horns. This provides atmospheric pressure in the bowl and that's why the engine runs fine regardless of whether the center carb has a working second vent. The vent on the center carb, if present, should only be open when the throttle is at the curb idle position. Curb idle for an emmisions carb is fully shut; that is key off, so throttle-stop solenoid is retracted. In other words, the external vent is closed when the engine is running. See here: pages 32. http://www.hamtramck-historical.com/ServiceHighlights/1970PassengerCarHighlights09.shtmlWhether there is enough vapor that could exit the vent and start a fire does seem rather dubious. Every vehicle until the vapor savers came along have open vents. The only difference being that most were protected by the air cleaner. Doing so keeps dirt out as there is air flow into the bowl as fuel flows out and fuel level drops. This is not to say that once there is fire, fuel vapor present would not contribute to its growth - of course it will!
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