My lines from the ports to the catch can are 1/2" on both ports but the actual size of the ID of the port on the valve cover and the fitting I used in place of the PCV are closer to 3/8". I assume this is sufficient enough since I havent ever had a problem. I wouldnt think running without a PCV and instead to atmosphere would cause any issues with breathing well under decel. I mean, at least it can still push that crankcase pressure out to atmosphere and I dont think it needs to be sucked on by the intake manifold. Even Tony from T1 says to have them go to atmosphere and get rid of the PCV system all together just like I have done. Again, I have never had any problems with oil burn on decel or anything. As a matter of fact, my car has never lost a drop of oil in the engine from day one.

You can see how mine is in these pictures.

 

This is what Tony Palo told me to do when I used to run the Krankvents still hooked up to the intake manifold. He should know whats best and I went with his advice.

Scroll down to about the middle and you will see his post to my question.

https://www.s2ki.com/forums/index.ph...=648691&st=100

This is his response in the thread.

QUOTE (Spoolin @ Dec 28 2008, 05:02 PM)
I do have a Krankvent at my PCV valve that also runs to a small catch can (its an air compressor water catch but works well) and back to the intake manifold. I also have a Krankvent from my front stock valve cover port that runs to my turbo intake so that I do have vacuum on it. Do you think this is adequate enough for over 600 whp? Again, I haven't had any problems in over a year but I'll still log the pressure when I can. I'm just curious if I'll be fine the way I have it.

Thanks for the help.

(Tony1)
Not at all. For some reason the S2K guys got on that bus, but the 'Krankvent' deal is a joke.

Anything going back to the intake manifold is worthless in a forced induction application. You can't bleed crankcase pressure into a pressurized intake manifold.

Going to the intake of the turbo is better, but without a catch can inline or a really good baffled valve cover, you are likely to pull some oil into the turbo inlet, which you don't want. You're not going to pull a vacuum on the crankcase with this method.

I would take both of your vents from the valve cover and run them into a filtered catch can and leave them breathing to atmosphere.

 

He is correct in that you can't reroute crank case pressure back into a pressurized intake manifold, which is why you have the additional breathers going to the catch can. Essentially the breathers to the catch can is for wide open throttle.

Under decel though, on a car equipped with a PCV valve, the valve will open and help suck in any additional pressure. Without proper ventilation you will blow out dipsticks and can cause turbos to smoke.

The breathers for WOT are the most important as that is what will generally rob you power and cause the most damage if they are not sufficient. I am still a fan of running a good PCV though. Since most factory PCV's do not work very well at high boost and leak (therefore pressurizing your crank case under boost) many people just eliminate it since it also prevents getting oil into your intake. Many cars don't develop any problems running without a PCV, but to be safe and to give me piece of mind I will be running a heavy duty, high quality check valve in place of my PCV and run it through a sealed can and back to the intake manifold.

 

The way you mentioned running your PCV is the way I used to have mine but I had a KrankVent in place to stop the boost pressure from going into the engine via the PCV valve but it still worked the same as if I had a heavier duty PCV and Tony said to ditch it. Its basically the same thing youre doing with a heavier duty PCV valve but only keeping the stock PCV and using another inline valve to stop the boost. To each his own though. I haven't blown out a dipstick under decel nor burn any oil so I guess my way is working for me.

 

It sounds like the krankvent is just a higher quality check valve that works at higher pressures. Just by design, check valves are a bit of a restriction, so a PCV + check valve will restrict that line a bit. I am just ditching the factory PCV altogether and running with just the check valve to the intake manifold.

 

I think the problems started for Precision turbos when they move production to overseas. Not sure but thats what one tuner told me.

 

you need to slow down the oil flow to the turbo and you're fine. ball bearing turbos are over rated....

 

do they make a divided housing BB6262?