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pcv and breather question

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Old Jun 26, 2010 | 08:03 PM
  #1  
88fastgta's Avatar
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From: Raleigh, NC
Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
pcv and breather question

hey i was wondering could i put a breather on the passenger side valve cover and leave the driver side connected like stock.... could i just put breathers on both side.... i just wanna clean up my engine bay alittle more... i heard that its a bad thing to have both breathers but its ok to have one breather as long as one side is still hooked up..... here is my engine bay now.... as you can see the passenger side has more wires than i want.. i cleaned it up alot from stock..... also can i cut the two air diverter valve connections off... i deleted that and programmed it out of my computer....

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Old Jun 27, 2010 | 12:40 AM
  #2  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: pcv and breather question

Originally Posted by 88fastgta
hey i was wondering could i put a breather on the passenger side valve cover and leave the driver side connected like stock..
Could but some have had idle problems because the air going to PCV valve( then to engine) is not being metered. Same as having a vac leak

Originally Posted by 88fastgta
could i just put breathers on both side....
You could but would not be getting airflow through engine to remove fumes and condensation as intended

Originally Posted by 88fastgta
i just wanna clean up my engine bay alittle more.
You are only going to be removing one hose; it is not as if it clutters up the engine bay
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Old Jun 30, 2010 | 10:26 AM
  #3  
RED86Z28's Avatar
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From: Savannah GA
Car: 1986 IROC
Engine: 355" TPI
Transmission: 700R4
Axle/Gears: 3.42
Re: pcv and breather question

You can dump the breather line but you need to keep the PCV hooked up. I dont see why you want to change anythingl. Your engine looks good as it is.
You can cut and cap the wires that are no longer used.
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Old Jun 30, 2010 | 10:27 AM
  #4  
RED86Z28's Avatar
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From: Savannah GA
Car: 1986 IROC
Engine: 355" TPI
Transmission: 700R4
Axle/Gears: 3.42
Re: pcv and breather question

You can dump the breather line but you need to keep the PCV hooked up. I dont see why you want to change anythingl. Your engine looks good as it is.
You can cut and cap the wires that are no longer used.
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Old Jun 30, 2010 | 10:38 AM
  #5  
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From: Savannah GA
Car: 1986 IROC
Engine: 355" TPI
Transmission: 700R4
Axle/Gears: 3.42
Re: pcv and breather question

You can dump the breather line but you need to keep the PCV hooked up. I dont see why you want to change anything. Your engine looks good as it is.
You can cut and cap the wires that are no longer used.
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Old Jun 30, 2010 | 10:39 AM
  #6  
built91Z28's Avatar
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From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: pcv and breather question

Originally Posted by vetteoz
Could but some have had idle problems because the air going to PCV valve( then to engine) is not being metered. Same as having a vac leak


You could but would not be getting airflow through engine to remove fumes and condensation as intended


You are only going to be removing one hose; it is not as if it clutters up the engine bay
I thought you had to have some type of breather on the side opposite the PCV? Wether it hooks into the intake tubing or just a breather.
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Old Jun 30, 2010 | 10:53 AM
  #7  
regal301's Avatar
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From: RHODE ISLAND
Car: 1988 iroc-z
Engine: 350 Vortec TPI
Transmission: 700r4
Axle/Gears: 3.73 4th gen Torsen 10bolt
Re: pcv and breather question

you do,you have to have a filtered air inlet supply on one cover and a pcv valve on the other side it allows removal of the blow-by gasses and helps avoid pressure build up in the engine so you dont blow out your seals.

the way its plumbed on the tpi setup in my opinion is already very clean looking and simple.i would leave it alone. or you could get the braided hose cover and dress it up but dont re-route or alter it.
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Old Jun 30, 2010 | 11:02 AM
  #8  
regal301's Avatar
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From: RHODE ISLAND
Car: 1988 iroc-z
Engine: 350 Vortec TPI
Transmission: 700r4
Axle/Gears: 3.73 4th gen Torsen 10bolt
Re: pcv and breather question

also as said,a push in breather is a bad idea on a mass airflow setup,as the air going in the engine through the push in breather will be unmeasured by the maf sensor as it travels through the crank case up the pcv valve and into the intake.

from the factory it gets the inlet air supply after the maf , right at the throttle body.

it can be done,and the car would run ,but it would not be in your best interest.
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Old Jun 30, 2010 | 11:52 AM
  #9  
built91Z28's Avatar
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From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: pcv and breather question

Originally Posted by regal301
also as said,a push in breather is a bad idea on a mass airflow setup,as the air going in the engine through the push in breather will be unmeasured by the maf sensor as it travels through the crank case up the pcv valve and into the intake.

from the factory it gets the inlet air supply after the maf , right at the throttle body.

it can be done,and the car would run ,but it would not be in your best interest.
Ahh, ok. That makes complete sense. Thats why I was asking before about the breather but forgot about the MAF.
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Old Jul 22, 2011 | 10:59 PM
  #10  
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Re: pcv and breather question

On my 88 camaro I'm running a 350 from an 87 vette. I have some blowby coming from the passenger side vent on the valve cover. I took off the ccv elbow that connected to the throttle body and put a push in breather with a grommet. Then i capped the 2 holes on the left side of the throttle body. On the pcv valve side, i just put a new pcv valve in and a new OEM grommet from Napa. Is this detrimental at all besides the venting of fumes into the engine bay?
This is the breather im running on my passenger side valve cover.
http://www.summitracing.com/parts/SUM-G3400/

Also, some of the fumes leak through to the cabin. Do I risk combusting these fumes with a cigarette?
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Old Jul 23, 2011 | 12:07 AM
  #11  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: pcv and breather question

Originally Posted by bijjincam88
I put a push in breather
Is this detrimental at all besides the venting of fumes into the engine bay?
Read post # 8 above if you have a MAF setup.
Makes no difference to tune on MAP cars
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Old Jul 23, 2011 | 12:09 PM
  #12  
bijjincam88's Avatar
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Re: pcv and breather question

I have MAF...that's what i figured, but then what do you suggest as the best option? Should i try and replace the elbow and run the hose to the top hole on the throttle body with an inline fuel filter and just cap the bottom hole? That breather hose was gunking my throttle body up with oil.

The reason why I have the blow by is my 3rd cylinder has lower compression. So what options do i have other than a rebuild?

Also, where can i find this stupid elbow? the one that i replaced looked like the guy tried glue a tear in it back together so i threw it out...

Oh and, are these fumes combustible?
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Old Jul 23, 2011 | 12:13 PM
  #13  
Apeiron's Avatar
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: pcv and breather question

Originally Posted by bijjincam88
So what options do i have other than a rebuild?
If it's low because of bad ring sealing, then a rebuild is all you've got.
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