Breather and PCV discussion - Page 3

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Breather and PCV discussion

This is a discussion on Breather and PCV discussion within the Veloster Performance forums, part of the Veloster Turbo Garage category; After you've ran it for some months and have proof of clear benefits then, id get on here and say its a required foundational mod. ...

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Thread: Breather and PCV discussion

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    After you've ran it for some months and have proof of clear benefits then, id get on here and say its a required foundational mod. I just dont think everybody should go ripping their occs off.

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    Quote Originally Posted by Dcannon203 View Post
    JD do you ever see me around town, i never see anyone but a yellow NA and a black NA.
    I'm up in enfield and commute to Northampton MA, I don't head south past Hartford often. What part of CT are you from?
    I see quite a few in my travels. I think I see Chris/rpw on 91 sometimes.
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    Quote Originally Posted by leesrt View Post
    Ok, so with this set up I think I agree. Your saying you're basically converting the PCV side into a breather that's assisted by a vacuum pump? Do I have that right?

    Venting the PCV to air I don't agree with because you loose the vacuum assist to help evacuate those gasses but if I'm reading what you're saying right it sounds good.
    Yes, convert PCV to a breather and VTA or ideally connect to a vacuum source such as pan evac or vacuum pump that does not go back to the motor. VTA is not an issue. Remember, in oem form slight air may be leaking through the PCV from the intake manifold and blowby entering the valve cover at an increasing rate all you have is high pressure(not good) in the valve cover and lower pressure of the atmosphere creating the pressure differential to draw the air out. With my setup having 2 breathers the valve cover pressure is much less(good) than the oem setup. And like mentioned, hook to a vacuum source that does not go back to the motor you'll gain power and not circulate things back to the motor for the cons.....
    JD284 likes this.
    '15 Auto VT

    PB's with slips and video:

    60' ET 2.05
    1/8 ET 8.70
    1/8 MPH 85.68 MPH
    1/4 ET 13.421
    1/4 MPH 105.57 MPH

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    Quote Originally Posted by leesrt View Post
    The valve cover is separated all the way up to the point of the rotors by the gaskets that go down the middle around the spark plugs openings. That is enough separation to create the vacuum needed to feed the PCV side without just drawing air directly from the breather port. Suggesting that the PCV just draws air from the breather is silly and shows and misunderstanding on how the system works. As can be seen in the picture below. There is quite a bit of separation between each side and the end were the chain (rotor) is located is quite full so it's not this big open chasm as suggested by the valve cover that just free flows air. There are also separate ports coming up from the CC on each side of the valve area that also allow each side to receive gasses from the CC up through the valve cover area.

    Attachment 88914
    Just to correct something you mentioned. The distance between the breather and the PCV has nothing to do with vacuum at all. It is made that way to sweep as much dirty air out as possible.
    The pressure differential on the oem setup When not in boost is created by vacuum in the intake manifold when overcoming slight vacuum in the intake and higher pressure in the valve cover. Then under boost the even higher pressure under the valve cover and vacuum in the intake creates a pressure differential to force air out the breather.
    '15 Auto VT

    PB's with slips and video:

    60' ET 2.05
    1/8 ET 8.70
    1/8 MPH 85.68 MPH
    1/4 ET 13.421
    1/4 MPH 105.57 MPH

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    Quote Originally Posted by trdtoy View Post
    Just to correct something you mentioned. The distance between the breather and the PCV has nothing to do with vacuum at all. It is made that way to sweep as much dirty air out as possible.
    The pressure differential on the oem setup When not in boost is created by vacuum in the intake manifold when overcoming slight vacuum in the intake and higher pressure in the valve cover. Then under boost the even higher pressure under the valve cover and vacuum in the intake creates a pressure differential to force air out the breather.
    Yes, that part I get. I would like to see some testing with your set up. What would you use as the external pump to create vacuum for the PCV side?
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    Quote Originally Posted by Veloturbo View Post
    The engine is a vaccuum pump, and the pcv only works under vaccuum. Im not trying to tell you your wrong per say, i just dont think its worth it for obvious reasons. Why did everyone for all these years waste money on catch cans if all they had to do was put a breather filter on?
    The PCV is there for emissions, not performance. Have not seen any obvious reasons yet to make it not worth it? Could you explain please?

    People put catch cans on to filter the air going back to the motor to avoid cons of the vapors, that's all. Putting a breather on is not ideal at all if just going to VTA as it will create more pressure build up in the valve cover.

    What I'm doing is the best of both worlds scenario. Less pressure in valve cover at all times and 0 vapors entering the motor.....
    '15 Auto VT

    PB's with slips and video:

    60' ET 2.05
    1/8 ET 8.70
    1/8 MPH 85.68 MPH
    1/4 ET 13.421
    1/4 MPH 105.57 MPH

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    Quote Originally Posted by Veloturbo View Post
    After you've ran it for some months and have proof of clear benefits then, id get on here and say its a required foundational mod. I just dont think everybody should go ripping their occs off.
    I'd love to do this on a pretty new car to show benefits over time of 0 vapors going through the motor. Showing gains on the dyno will be a little easier on any car.....
    '15 Auto VT

    PB's with slips and video:

    60' ET 2.05
    1/8 ET 8.70
    1/8 MPH 85.68 MPH
    1/4 ET 13.421
    1/4 MPH 105.57 MPH

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    Quote Originally Posted by leesrt View Post
    No, not on this car but I have seen enough photos from every angle to understand what's going on and I have seen plenty of engines with their valve covers removed so it's not a foreign topic for me. Is there something I stated about how things are working under the valve cover that is wrong?

    Valve covers aren't complicated things, it's quite easy to see how it's designed and why.
    The valve cover is NOT partitioned into disparate chambers. Period. It is a common chamber and regardless of there being quasi-isolated halves/portions, pressure equalization still occurs.

    The whole point of this exercise is to get people thinking about how to achieve continual vacuum in the valve cover, which is best for performance. trdtoy and I have been discussing this on and off for several months to come up with an easy way to do this.

    I told him recently I was using a directional breather in place of the oil filler cap and it's working very well, so that kickstarted him into revisiting this concept. trdtoy is experimenting with eliminating the PCVV and opening up that orifice for more balanced vapor evacuation. More vacuum (less positive pressure in this case) equals less blowby and less of a need for catch cans as a result.

    This is why your observations here are pretty much invalid. We couldn't care less about how the breather and PCVV work in tandem as designed. We're throwing it out the window by adding more breathers and possibly throwing a separate vacuum pump into the mix.

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    Quote Originally Posted by MA1tR!X View Post
    How much does it effect your fuel economy (and how much does it smell)?
    Should not effect fuel economy that much if any at all. Smell will be determined by where you vent the lines to.
    '15 Auto VT

    PB's with slips and video:

    60' ET 2.05
    1/8 ET 8.70
    1/8 MPH 85.68 MPH
    1/4 ET 13.421
    1/4 MPH 105.57 MPH

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    Quote Originally Posted by JD284 View Post
    So when's the DIY guide coming out?
    I will post a DIY if need be.....
    '15 Auto VT

    PB's with slips and video:

    60' ET 2.05
    1/8 ET 8.70
    1/8 MPH 85.68 MPH
    1/4 ET 13.421
    1/4 MPH 105.57 MPH

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