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Originally Posted by herkyhawki
This will mainly help high-mileage engines. Large amounts of oil are an indication of excessive blow-by due to worn piston rings. As the amount of blow-by increases, the velocity of flow through the PCV system increases. The faster-flowing air is able to keep more oil-mist particles in suspension, and therefore carries more oil mist through the PCV system.
One thing to keep an eye on is to watch for new leaks from your engine gaskets. Addition of this filter will increase the pressure that is acting on all the seals and gaskets in your engine.
With all things considered, it is probably a good idea IF the separator screen is always clean, AND you change your oil often.
Another indication of excessive blow-by or plugged/restricted PCV is prescense of oil in the breather inlet line (hose from air filter to valve cover).
When the amount of blow-by exceeds the amount that can flow through the PCV valve, the blow-by starts to flow OUT of the breather line, where it is sucked into the main air intake. If your intake butterfly is getting gummed up, this is why. So if the addition of this separator causes restriction, you should keep an eye on the breather hose for signs of oil.
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I understand what you are saying, but my friend just installed this on his 2004 Civic with 20,000 miles and he is already seeing collection after only 1000 miles. Honda's are known to really consume oil through the PCV system.
This system will NOT cause crankcase pressure. I just removed the hose connected to the PCV valve and stuck my finger over the hole and the suction was so strong it kinda hurt and left a raised area of skin that was sucked up the hole in the hose. I then removed the hose from the outlet side of the filter and again stuck my finger over the hole and was met with the same state with no real difference felt.
The filter in this setup is not a serious restriction in this system. The filter element is extemely thin and I wish you guys would go buy one and look instead of saying it is restrictive from your computer chair. There is no way a liquid can plug this small hollow porous filter element. It just won't happen.
As said earlier, I thought the same thing as you guys and cut the element off only to have to much PCV flow through causing the engine to perform and idle like I had a vacuum leak.
I will prove this by attaching a vacuum gauge sometime in the near future for you guys to show the relative small difference.