Oil catch can

[HSKR R/T]

If the can (hence the line) is clogged it will definitely increase crankcase pressure, as it is a closed system and the pressure has nowhere to go except eventually out the seals. The intake side doesn't matter on a N/A if its sealed or not, its actually better if it is sealed like old style engines that also vented crankcase pressure directly to atmosphere. The intake side on N/A is always a vacuum when running. Actually considering a new can with a vent to atmosphere to avoid this situation. Fundamentally I had the same situation as a stuck closed PCV valve. Its not good, hence the idle issues.

That's not how the PCV system works. I suggest you do a little more research on it. By "intake" I mean the air intake from air box to throttle body. There should be zero vacuum on that.

 

[A-TEAM]

Ive done all the research I need to do. I know how it works, and it works exactly how I explained it, hence my success in fixing said system and fixing my idle issues. If you have more to add about how it functions, please share what you know.

 

[Namelama]

Hi, I'm considering installing an oil catch can. What is a good brand that's easy to maintain empty and clean?

Easiest thing I've ever installed.

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[mikeru82]

Easiest thing I've ever installed.

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Discover J&L OSC oil catch cans/oil separators for Mopar engines. Built for Dodge, Chrysler, Jeep, and Ram to protect your engine. Shop today.

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My main concern with that catch can is the small capacity. It only holds 3 oz of liquid. I hope you’re planning on checking/emptying it often, especially in winter months.

 

[HSKR R/T]

Ive done all the research I need to do. I know how it works, and it works exactly how I explained it, hence my success in fixing said system and fixing my idle issues. If you have more to add about how it functions, please share what you know.

The PCV valve is connected to the intake manifold and has the vacuum on it. The other hose that connects to the intake tube(between air filter and throttle body, is fresh air inlet into the crankcase. There is no valve on that line. pCV is not "sealed". That tube not on the PCV valve side will vent to air is there is pressure in crankcase

 

[A-TEAM]

The intake hose side will vent, but not effective enough to reduce pressure as it is designed as a one way system, with flow going in, not out of that side. Even the small amount of venting that happens when the valve side is clogged/ stuck closed will saturate the intake tube and TB with oil vapor, and run positive pressure in the crankcase, causing further problems. The system is designed for the crankcase to have slight vacuum, never positive pressure. When I was referring to a closed system, I mean the pcv valve side plumbing where the catch cans are tapped, that is a closed loop from valve cover to the intake port. Block off that hose with a clamp, stuck pcv valve or in my case, a clogged catch can and the hemi becomes very upset because she cant breathe properly. Poor idle is the first sign, but left unfixed can cause serious issues with gaskets because that pressure and oil vapor has no where to escape and will eventually find a path through a valve cover gasket, main seal, etc.

 

[HSKR R/T]

The intake hose side will vent, but not effective enough to reduce pressure as it is designed as a one way system, with flow going in, not out of that side. Even the small amount of venting that happens when the valve side is clogged/ stuck closed will saturate the intake tube and TB with oil vapor, and run positive pressure in the crankcase, causing further problems. The system is designed for the crankcase to have slight vacuum, never positive pressure. When I was referring to a closed system, I mean the pcv valve side plumbing where the catch cans are tapped, that is a closed loop from valve cover to the intake port. Block off that hose with a clamp, stuck pcv valve or in my case, a clogged catch can and the hemi becomes very upset because she cant breathe properly. Poor idle is the first sign, but left unfixed can cause serious issues with gaskets because that pressure and oil vapor has no where to escape and will eventually find a path through a valve cover gasket, main seal, etc.

Or through the other side of the PCV system that is normally the in side of airflow. You can replace that tube with just a breather filter and plug the nipple on the air box lid. And it will vent to atmosphere even if you cap the PCV valve. Which is also why a vented catch can doesn't work and will cause idle issues. Because you are basically just creating a vacuum leak.

Also, it's called "positive" crankcase ventilation, not negative.

 

[A-TEAM]

“Positive” doesn’t mean pressure, it means forced ventilation, as opposed to passive venting like you are describing. The system uses vacuum as a method for “positive” control. A passive vent to atmosphere will reduce pressure and save the gaskets for sure, but a lot of the blow by and vapor would stay in the oil and contaminate it quicker. Hence the positive system.