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Author Topic: Air/Oil Separator for PVC and VC Breather?  (Read 10444 times)
Chickenbone
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« on: May 03, 2017, 11:14:58 am »

Can I plumb both the PCV and valve cover breather into the same air/oil separator?  Or is that a physics "no no"?  This would be for a naturally aspirated 351W; with EFI.

Chickenbone
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juiced coupe
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« Reply #1 on: May 03, 2017, 12:19:19 pm »

No, it won't work. The breather would negate the PCV.

And no, you shouldn't use a PCV with a open breather on a efi application.

http://sbftech.com/index.php/topic,4177.0.html
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
Chickenbone
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« Reply #2 on: May 03, 2017, 12:59:21 pm »

Thankks JuicedCoupe!

I wondered why I haven't seen that done anywhere.  My original intent was to run the oil/air separator with the pcv system.  Then I got this "bright" idea.  Good thing I asked  Grin
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z-adamson
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« Reply #3 on: May 04, 2017, 02:20:09 pm »

No, it won't work. The breather would negate the PCV.

And no, you shouldn't use a PCV with a open breather on a efi application.

http://sbftech.com/index.php/topic,4177.0.html

Open breather works fine on EFI.........if its SD, last I checked.

MAF with open breather would introduce air into the intake that is not metered by the mass air flow sensor.
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juiced coupe
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« Reply #4 on: May 04, 2017, 02:38:15 pm »

Open breather works fine on EFI.........if its SD, last I checked.

True. Technically.


But lets be realistic.
-Factory SDs were pretty shitty then and are commonly converted for good reason. They are extremely finicky, some more so than others.
-If you were running a aftermarket SD, you can likely tune around whatever setup you want to run.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
Outlaw Bill
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« Reply #5 on: May 04, 2017, 04:36:59 pm »

My speed density ran fine with open breathers.
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juiced coupe
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« Reply #6 on: May 04, 2017, 05:04:54 pm »

My speed density ran fine with open breathers.

We we talking about using a open PCV system, with a PCV valve and open breather. Basically, a unmetered vacuum leak.
Logged

Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
Outlaw Bill
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« Reply #7 on: May 04, 2017, 10:02:46 pm »

My speed density ran fine with open breathers.

We we talking about using a open PCV system, with a PCV valve and open breather. Basically, a unmetered vacuum leak.
Yeah you can't do that.
Logged

www.TeamZmotorsports.net

TeamZmotorsports 25.2 outlaw drag radial stock suspension 1991 Mustang
Thank You to the following for their help
TeamZmotorsports
Marcella Manifolds
Schoneck Composite
Ultimate Converter Concepts


"Stupid is as stupid does", "You can't fix stupid"
"Common sense is not common"
z-adamson
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« Reply #8 on: May 05, 2017, 11:05:45 pm »

Yeah you can't do that.

Yeah you can, unless a mass airflow sensor is used.

If a mass airflow sensor is not used then there is no reason NOT to use a pcv valve on one valve cover and an open breather on the other.
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z-adamson
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« Reply #9 on: May 05, 2017, 11:18:55 pm »



True. Technically.


But lets be realistic.
-Factory SDs were pretty shitty then and are commonly converted for good reason. They are extremely finicky, some more so than others.
-If you were running a aftermarket SD, you can likely tune around whatever setup you want to run.

True, technically,  but lets be realistic. Finicky and converted these days or not, they still work just dandy with an open breather on one valve cover and a pcv valve on the other which is what this thread is about. I don't get the impression the op was starting a sd vs maf thread.


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juiced coupe
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« Reply #10 on: May 05, 2017, 11:29:20 pm »

Lets be realistic.

Nobody gives a fuck about anything you have to say.
Logged

Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
al2
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« Reply #11 on: May 05, 2017, 11:47:24 pm »

No doubt !!
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z-adamson
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« Reply #12 on: May 06, 2017, 12:32:13 am »


And no, you shouldn't use a PCV with a open breather on a efi application.

Why would anyone care what you have to say when you post up b.s. like this?

Anyone that understands the most basic of basics about how efi works knows that this is only the case when a mass airflow sensor is used. Otherwise a pcv valve with an open breather is fine.
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knucklefux
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« Reply #13 on: May 06, 2017, 12:46:35 am »

Wrong.

Speed density won't work correctly with unregulated vacuum leaks either.  Even a carbureted engine runs better without the vacuum leak you're creating with a pcv and open breather.

It's real simple...do one or the other for best results.  This isn't about what you can get by with, it's about doing shit the right way.
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juiced coupe
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« Reply #14 on: May 06, 2017, 01:17:33 am »

I honestly don't get it.

Most likely, the best thing that you ever posted.
Logged

Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
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