what is this?
Now get a catch can for the dirty air side.
The stock system allows a bunch of oil to enter into the intake manifold. This effects airflow and pollutes the air/fuel mixture wich can cause detonation. The back sides of your intake valves will become caked with collegiated oil. (my valves and piston tops where)
This is a very serious problem, and combined with DOD activation, it is easy to burn thru oil rather quickly. Definitely not good..
The stock system allows a bunch of oil to enter into the intake manifold. This effects airflow and pollutes the air/fuel mixture wich can cause detonation. The back sides of your intake valves will become caked with collegiated oil. (my valves and piston tops where)
This is a very serious problem, and combined with DOD activation, it is easy to burn thru oil rather quickly. Definitely not good..
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TECH Regular
Joined: Nov 2009
Posts: 446
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From: Farmington Hills, MI
Maybe a turbo car is different, but when I ran both the clean and dirty side into the manifold under vacuum I saw a nasty buildup of condensation in my valve covers... not good.
I wouldn't recommend that... you are creating a vacuum leak. I screwed this up a while ago, because the PCV system is different on newer cars and I didn't realize it at first.
There is a clean side and dirty side to the system. At WOT, both will flow into the manifold. If you do a lot of high RPM stuff, like land speed or circle track racing, you'll actually want to put a catch can on BOTH sides!
At part throttle, air flows through the MAF (and is therefore metered) and into the clean side, through the crank case, and out the dirty side. This cycles the all of the nasty blow-by back into the combustion chamber and out of the exhaust. There is a lot of stuff you don't want in there, but iirc sulfur dioxide is the biggie. It's acidic, and will rot the engine out from the inside. The metered air that flows through the clean side mixes with the blow-by, but the blow-by isn't combustable so it doesn't matter from a fueling perspective.
So, you want to leave that tube hooked up between the MAF and the throttle, and the dirty side should always go directly into the manifold. Using breathers not only messes with emissions, but also shortens the life of your engine.
I wouldn't recommend that... you are creating a vacuum leak. I screwed this up a while ago, because the PCV system is different on newer cars and I didn't realize it at first.
There is a clean side and dirty side to the system. At WOT, both will flow into the manifold. If you do a lot of high RPM stuff, like land speed or circle track racing, you'll actually want to put a catch can on BOTH sides!
At part throttle, air flows through the MAF (and is therefore metered) and into the clean side, through the crank case, and out the dirty side. This cycles the all of the nasty blow-by back into the combustion chamber and out of the exhaust. There is a lot of stuff you don't want in there, but iirc sulfur dioxide is the biggie. It's acidic, and will rot the engine out from the inside. The metered air that flows through the clean side mixes with the blow-by, but the blow-by isn't combustable so it doesn't matter from a fueling perspective.
So, you want to leave that tube hooked up between the MAF and the throttle, and the dirty side should always go directly into the manifold. Using breathers not only messes with emissions, but also shortens the life of your engine.
Maybe a turbo car is different, but when I ran both the clean and dirty side into the manifold under vacuum I saw a nasty buildup of condensation in my valve covers... not good.
I wouldn't recommend that... you are creating a vacuum leak. I screwed this up a while ago, because the PCV system is different on newer cars and I didn't realize it at first.
There is a clean side and dirty side to the system. At WOT, both will flow into the manifold. If you do a lot of high RPM stuff, like land speed or circle track racing, you'll actually want to put a catch can on BOTH sides!
At part throttle, air flows through the MAF (and is therefore metered) and into the clean side, through the crank case, and out the dirty side. This cycles the all of the nasty blow-by back into the combustion chamber and out of the exhaust. There is a lot of stuff you don't want in there, but iirc sulfur dioxide is the biggie. It's acidic, and will rot the engine out from the inside. The metered air that flows through the clean side mixes with the blow-by, but the blow-by isn't combustable so it doesn't matter from a fueling perspective.
So, you want to leave that tube hooked up between the MAF and the throttle, and the dirty side should always go directly into the manifold. Using breathers not only messes with emissions, but also shortens the life of your engine.
I wouldn't recommend that... you are creating a vacuum leak. I screwed this up a while ago, because the PCV system is different on newer cars and I didn't realize it at first.
There is a clean side and dirty side to the system. At WOT, both will flow into the manifold. If you do a lot of high RPM stuff, like land speed or circle track racing, you'll actually want to put a catch can on BOTH sides!
At part throttle, air flows through the MAF (and is therefore metered) and into the clean side, through the crank case, and out the dirty side. This cycles the all of the nasty blow-by back into the combustion chamber and out of the exhaust. There is a lot of stuff you don't want in there, but iirc sulfur dioxide is the biggie. It's acidic, and will rot the engine out from the inside. The metered air that flows through the clean side mixes with the blow-by, but the blow-by isn't combustable so it doesn't matter from a fueling perspective.
So, you want to leave that tube hooked up between the MAF and the throttle, and the dirty side should always go directly into the manifold. Using breathers not only messes with emissions, but also shortens the life of your engine.
) The clean side air should be left intact.
