these are the 2 setups i've heard so far but which is better:

1.) i did a search and majority of it involves hooking up the catch can between the pcv and the intake manifold. this setup is pretty straightforward and it's easier to understand the process of how it works.

2.) this second method was introduced to me by my mechanic when he saw my setup. i know that some people have done this before but i'm confuse about how it works and if it's any better than the first method.

my setup involves a breather filter on the valve cover and leaving the pcv hook up same as stock. when my mechanic saw it, he suggests that having a breather filter on the valve cover is quite dangerous coz when the filter gets clogged the crankcase pressure will be great to the point that when you take off the breather filter, you will hear the pressure escape. he said he experienced it before on a customer's car.

having said that, he also mentioned that the stock hook up of the pcv to the intake manifold is not good also as there's a great pressure when the turbo boost.

he recommends me to connect the pcv hose to a catch can and plug the intake manifold where the pcv hose is originally connected. then he also told me to discard the breather filter and connect a hose where the breather filter was before and route the hose to the catch can as well.

if the second will work then i think that it should be better than the first method but the problem is how does the second method work??? i told my mechanic that the pcv won't have any vacuum source anymore so how could the oil vapor pass through it, he told me that it's the pressure that will push it open and not vacuum?

what the hell does he mean by pressure? where does this pressure come from? how does the second method work if it actually works? how will the pcv behave during idle, it will be close coz of no vacuum source so where does the vapor vent? what about during WOT how would it work? could any one please explain to me the process of how the second method works(if it really works)? i'm having a hard time analyzing it from the workings of a stock pcv system.

 

I want to know the anwser to that to.

 

me too...bump!

 

Whoa-whoa whoa! So many questions.

First, the pressure in the crankcase is becasue the rings don't seal perfectly and exhaust will pressurize the crankcase. At high rpm the pressure is quite high.

The second method just routes all the pressure to the can and out to atmospehere. It is an open system.

The present system on your car is a closed system which uses the intake to regulate the crankcase gases.

You are looking at the difference between a closed and open system.

Randy

 

I don't see how the valve cover breather filter would clog up so much that it would not let pressure escape. It's basically oil vapor coming out of the valve cover .....you use oil to coat the K&N filter anyways......just make sure you clean it routinely.
JT actually helped me on this point about open loop and closed loop systems. You don't really need the catch can in that second method. You can route a hose off the valve cover (or not) and put a filter on that then remove the pcv valve and replace it with a hose barb and run another hose off of that and attach another filter like the one on the vlave cover. This way, crankcase pressure will just flow out of the car under boost, more important than when it idles, I think. Your oil may become dirtier quicker since there is no vacuum drawing vapor out under idle. If you are not going to have any vacuum source for the pcv valve, then get rid of it. Your mechanic thinks the filter will clog on the vlave cover, then why wouldn't the filter on the catch can clog also?

There are some very good points in this thread:
https://honda-tech.com/zerothread?id=394876