PCV valve?

Discussion in '2011+ Mustang GT 5.0L Tech' started by dlanes, Apr 14, 2021.

  1. jewc75

    jewc75 S197 Junkie S197 Team Member

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    This forum is a fucking joke. Tech sections used to mean something.
     
    eighty6gt likes this.
  2. eighty6gt

    eighty6gt forum member

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    all of the good people left for the facebook group
     
  3. stkjock

    stkjock ---- Madmin ---- Staff Member Administrator Super Moderator S197 Team Member

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    They still do. Sorry that you think they don’t
     
  4. dlanes

    dlanes Junior Member

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    I'm surprised this post got so many replies but the main reason I got a catch can was to keep oil out of the new intake manifold I'm going to install. I imagine the oem intake is full of oil crud since this car never had a catch can.
     
    RED09GT and 06 T-RED S/C GT like this.
  5. Dino Dino Bambino

    Dino Dino Bambino I have a red car

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    There are still a lot of good people left on this forum trying to keep the tech sections alive. Those who have little or nothing of value to add in the tech sections tend to hang around in non-tech threads looking for arguments instead.

    A closed (to atmosphere) driver's side catch can that retains a one-way valve between the valve cover and the catch can (with flow direction towards the catch can) is definitely a good idea. That one-way valve can either be the existing PCV valve or an "upgrade". You're fortunate that the PCV valve is removable on the Coyote and that makes a substitute possible.
     
    RED09GT and 06 T-RED S/C GT like this.
  6. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    And yet your still on here, so what's your excuse :jester:

    I couldn't agree more nor had worded it any better myself :beer:


    I sure hope our replies and feedback provided the info you've been searching for as useful ;)

    Sure got that right about being fortunate with the PCV valve on the Coyote as being directly removable :thumb:
     
    Last edited: Apr 19, 2021
  7. eighty6gt

    eighty6gt forum member

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    I'm not good or smart enough to be on the FB group. No fenderwell lighting or wheels with the wrong offset or tires of the wrong height.

    It baffles me the concern people have with oil in their intake manifold. Cars since time eternal have had oil in the intake manifold. There's never been a proven case of Covid transmission outdoors, nor has there been one negative event from having some oil in an intake manifold.

    People need to take up unicycling or something.
     
    06 T-RED S/C GT likes this.
  8. Pentalab

    Pentalab forum member

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    My catch can would be 80% full. Once I switched to 100% synthetic oil, the catch can collects very little. Remember the pix Dimora posted on the roush forum, when he removed his blower ? Oil from one end of the intake manifold to the other. Plus oil soaked intercooler. All that oil in the intake manifold not only makes a helluva mess, it apparently, also reduces the octane rating a bit, of your gas.
     
    06 T-RED S/C GT likes this.
  9. eighty6gt

    eighty6gt forum member

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    I don't buy that last sentence. Where's the proof?


    What we actually have is marketing from places like BRENSPEED telling us we need a separator.

    Donate the seperator $$ to your favorite charity or political party - I suggest the mypillow guy or donald trump.
     
  10. Dino Dino Bambino

    Dino Dino Bambino I have a red car

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    Mine are $25 Chinese eBay jobbies and are perfectly fine. No need to spend $100+ per brand name separator. :D
     
  11. eighty6gt

    eighty6gt forum member

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    They don't weigh very much at least.
     
  12. stkjock

    stkjock ---- Madmin ---- Staff Member Administrator Super Moderator S197 Team Member

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    the Chinese? I think that an average one would go at least 125-130#
     
    Gabe, MrBhp, 06 T-RED S/C GT and 2 others like this.
  13. Juice

    Juice forum member

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    A PCV valve is NOT a check valve. It is more a variable orifice for the lack of a better description. It is resteicting flow (not blocking) under high vacuum conditions.
    No catch can on my car, and I run the piss out of it.
     
    eighty6gt and crjackson2134 like this.
  14. eighty6gt

    eighty6gt forum member

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    I should take apart the "pcv valve" in my car. Has anyone? Is it anything besides a baffle - it is possible it is just an orifice.

    There is a LOT of PCV flow. And high vacuum at idle.
     
  15. Juice

    Juice forum member

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    I have not investigated a 3v or coyote pcv. On older cars where pcv valves are replaced at tune up, there is clearly a moving part inside. Its there to reduce, not stop flow of crank case gases. For one thing, need to limit flow at idle, so the pcm can control idle. Once the car is driving, the pcv can fully open, vaccum does the rest. At zero vacuum, there meybe no pcv flow or gases get pushed into the intake from crank case pressure.
     
    06 T-RED S/C GT likes this.
  16. RED09GT

    RED09GT Equal Opportunity Offender S197 Team Member

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    There is a spring loaded plunger in a cylindrical valve, if you blow into it from one direction, it has minimal resistance in one direction but allows a small amount of backflow but anything more and it completely blocks.
    PXL_20210419_212920342.jpg PXL_20210419_212914365.jpg
     
    Last edited: Apr 19, 2021
    06 T-RED S/C GT likes this.
  17. eighty6gt

    eighty6gt forum member

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    Thanks
     
  18. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    I was neither good nor smart enough being on the FB group either. Got fed up with the same old boring posts regarding cold air intakes, same Mustang pics of the week and gossip which had nothing to do with the Mustang. So I closed out my FB account altogether over 2 years ago.

    Before I went FI, there was never an issue with having crankcase oil in the intake manifold. But once I did, there were noticeable amounts of CC oil seeping out from the throttle body via the intake manifold. My guess is due from the rings/seals of the stock motor not being able to handle the cylinder pressure of the Saleen blower, but I could very well be mistaken? All I know is once I added the catch can with inline one-way directional check valve, there hasn't been any further CC oil seepage coming out thru the throttle body at all :shrug:

    Pretty much the same reason I added the catch can.. Haven't made the switch to full synthetic oil as of yet, but if helps slow down the amount of crankcase blow-by? it's a win-win IMHO.

    On the Coyote 5.0 motors. From my understanding the PCV valve is a standard type which has a moving part inside. The PCV valve on the 3v is more along the lines of a check valve type with either a baffle or orifice that's integrated inside of the driver's side cam cover which is non-removable, unless it's cut open from the cam cover's housing tube :shrug:
     
    Last edited: Apr 19, 2021
  19. dlanes

    dlanes Junior Member

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    I think you mean passenger side as the drivers side never had a pcv valve.

    Yes I know, besides allowing more vacuum I don't really see a downside with N/A vehicle. The drivers side can still pull fresh air no problem.
     
  20. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    IIRC, it's either a baffle or just an orifice, but don't know that for certain :shrug:

    On the 3v at zero vacuum, gasses get pushed into the intake from crankcase pressure thru the passenger's side cam cover . This is the main reason some folks run catch cans on both the driver and passenger side. I believe Dino Dino Bambino has 2 catch cans on his "06" GT for that very reason. I'm not really sure about the Coyote PCV, other than it has a traditional spring loaded, cylinder plunger type :shrug:

    Dino Dino Bambino was referring to his "06" GT 3v which has the pcv valve on the driver's side, opposite of the Coyote pcv valve which is on the passenger side. I would also assume that when at zero vacuum, gasses get pushed into the intake from crankcase pressure thru the driver's side much in the same they get pushed into the intake from the opposite side on the 3v cars.
     
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