Breather hose with CAI

a_kraker99 · December 5th, 2008, 11:01 AM

I got a CAI off ebay and after reinstalling the breather hose that comes off the metal tube I was a little curious about how they work. The PCV line has a vacuum on it to let crank case gases out right? How is it that the breather does not have a vacuum on it as well? It is connected to the intake just like the PCV line is.

I suppose this isn't really a v6 specific thread, you may move it if you would like.

WLJohnson05 · December 5th, 2008, 11:06 AM

pcv line coming from the cai has air that goes in it for the most part and then on the other side the vacuum is pullin the gases from that line and it acts in a big circle

a_kraker99 · December 5th, 2008, 11:08 AM

but what causes the PCV line to be a vacuum and the breather line the opposite? Just the fact that the PCV line is on the other side of the throttle body?

WLJohnson05 · December 5th, 2008, 11:20 AM

cuz u have air running thru the cai and generally will have air go down in that line, but on other side like u said is on the other side of the tb and it is a big vacuum machine so it is sucking the air thru that line

the problem with this is that on boost applications this doesnt work so good because that vacuum system becomes a boost system when under boost which in turn actually blows air down in both lines.

F8L GT · December 5th, 2008, 11:40 AM

The other line coming out of the intake tube isnt really a breather line. it goes to your IAC and thats what allows your engine to get air when the throttle body is shut. if thats what your asking

a_kraker99 · December 5th, 2008, 11:44 AM

Originally Posted by SMSPerformance

The other line coming out of the intake tube isnt really a breather line. it goes to your IAC and thats what allows your engine to get air when the throttle body is shut. if thats what your asking

The tube I am looking at is going to the valve cover. Just before the throttle body.

F8L GT · December 5th, 2008, 11:47 AM

gotcha, on my gt i only have two lines, the pcv line and the line for the IAC. So im not sure about your other line.

WLJohnson05 · December 5th, 2008, 12:22 PM

Originally Posted by SMSPerformance

gotcha, on my gt i only have two lines, the pcv line and the line for the IAC. So im not sure about your other line.

GT is set up a lil bit different

a_kraker99 · December 8th, 2008, 08:48 AM

Is it the EGR or the breather hose making the throttle body dirty? I have seen some talk about breather mods but what does the mod do? Do you just replace the hose going to the intake tube with a breather filter?

December 5th, 2008, 11:01 AM	#1
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 176 iTrader: 0 reviews	Breather hose with CAI I got a CAI off ebay and after reinstalling the breather hose that comes off the metal tube I was a little curious about how they work. The PCV line has a vacuum on it to let crank case gases out right? How is it that the breather does not have a vacuum on it as well? It is connected to the intake just like the PCV line is. I suppose this isn't really a v6 specific thread, you may move it if you would like.

December 5th, 2008, 11:06 AM	#2
WLJohnson05 MM's Database Error 2004 Mustang V6 322.8 rwhp Join Date: Mar 2007 Location: VA Posts: 13,285 iTrader: 9 reviews	pcv line coming from the cai has air that goes in it for the most part and then on the other side the vacuum is pullin the gases from that line and it acts in a big circle __________________ I'm trying to get rid of this stuff, feel free to make me an offer!: SCT Mass Air Flow Sensor $200 Tial Wastegate Springs $40 (10psi and 3.6psi)

December 5th, 2008, 11:20 AM	#4
WLJohnson05 MM's Database Error 2004 Mustang V6 322.8 rwhp Join Date: Mar 2007 Location: VA Posts: 13,285 iTrader: 9 reviews	cuz u have air running thru the cai and generally will have air go down in that line, but on other side like u said is on the other side of the tb and it is a big vacuum machine so it is sucking the air thru that line the problem with this is that on boost applications this doesnt work so good because that vacuum system becomes a boost system when under boost which in turn actually blows air down in both lines. __________________ I'm trying to get rid of this stuff, feel free to make me an offer!: SCT Mass Air Flow Sensor $200 Tial Wastegate Springs $40 (10psi and 3.6psi)

December 5th, 2008, 11:40 AM	#5
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,917 iTrader: 13 reviews	The other line coming out of the intake tube isnt really a breather line. it goes to your IAC and thats what allows your engine to get air when the throttle body is shut. if thats what your asking __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ LINK-->Custom Race Transmission Build<--LINK

December 5th, 2008, 11:47 AM	#7
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,917 iTrader: 13 reviews	gotcha, on my gt i only have two lines, the pcv line and the line for the IAC. So im not sure about your other line. __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ LINK-->Custom Race Transmission Build<--LINK

December 5th, 2008, 11:08 AM	#3
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 176 iTrader: 0 reviews	but what causes the PCV line to be a vacuum and the breather line the opposite? Just the fact that the PCV line is on the other side of the throttle body?

December 8th, 2008, 08:48 AM	#9
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 176 iTrader: 0 reviews	What gums up the throttle body? EGR or Breather? Is it the EGR or the breather hose making the throttle body dirty? I have seen some talk about breather mods but what does the mod do? Do you just replace the hose going to the intake tube with a breather filter?

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Breather hose with CAI

Breather hose with CAI

What gums up the throttle body? EGR or Breather?