Crankcase ventilation directly to atmosphere?

[Kaifd3s]

What happens if I have a line connected to the intake, goes through a catch can, and then connected to the right side of my block (S14SR). Then plug off the pcv and plug up the line on the intake manifold. I mean it will have vacuum from the intake, and also I am leaving the line connecting the block to the valve cover.

Would this work?

[CarRamrod]

Originally Posted by Kingtal0n

You are contradicting yourself, first you said proper PCV system like factory, then you said catch can- which is no longer proper PCV. No factory engine comes with a mile of extra plumbing with a can in the center for catching oil. If anything there is a return style to push liquid oil back into the pan. There is no place for vapors, they go "wherever they want" i.e. into your compressor wheel, or into your intake manifold. Or they seep out from between clamps. Or they get pushed out of fittings or seals. Or you breath them in.


Point out one thing i said that wasnt true. Just one thing
You are simply not familiar with my style because you are new. Ill forgive you but try not to take the internet too seriously.

Proper PCV system can include a catch can. A factory PCV system + a catch can is an even better option than a factory PCV system that does not include a catch can. Remember catch cans CATCH all the crap you don't want in your intake that a PCV system without a catch can wouldn't. So I'm not sure how that's contradicting myself but ummm ok. Haha.

Lots of cars come with a factory catch can lol. You serious? That return style system is a return style CATCH CAN that just simply returns any oil caught by the can to the oil pan and then vents off the vapors on top using a 2 way valve. I'm not a fan of this style setup but it works. Again, do some research.

I'm new to this site but not to engines. Just because I haven't been on Zilvia.net for years doesn't mean I know nothing about cars or how they work.

Originally Posted by hobbs

Uh huh...

Not only did all of nissans highport DET motors come with an inline air/oil separator, highport DET motors have them build into the valve cover and USDM DE motors have the same air/oil separator. Regardless if they are plumbed back into the pan or left to collect and be drained by the user they still serve the same purpose and they are all catch cans.

Catch cans are always a good idea on motors that experience higher than OEM boost levels and capping a valve cover vent is never a good idea. A well thought out PCV/catch can setup will go a long way.

+1 for this comment. Good info right here.

Originally Posted by Kaifd3s

What happens if I have a line connected to the intake, goes through a catch can, and then connected to the right side of my block (S14SR). Then plug off the pcv and plug up the line on the intake manifold. I mean it will have vacuum from the intake, and also I am leaving the line connecting the block to the valve cover.

Would this work?

I'll need to see pics of what exactly you're talking about and from there I will help as much as I can.

Originally Posted by CarRamrod

I'm new to this site but not to engines. Just because I haven't been on Zilvia.net for years doesn't mean I know nothing about cars or how they work.

^ This man is right.

Originally Posted by Kingtal0n

Point out one thing i said that wasnt true. Just one thing
You are simply not familiar with my style because you are new. Ill forgive you but try not to take the internet too seriously.

^ This man is wrong and really has no clue what he is talking about.

I've had a catch can on one of my cars for years now. I added it on the PCV side of the system and it works wonders. Every time I change my oil I empty the can. There is always a fair amount of "shit" -- thats really the best and most technical description I can give it. Its brown sludge that does not resemble oil. I am very happy that its not in my intake system.

As for the non-PCV side, I currently have that left open on one of my cars - and not by choice. I have had a tough time finding the proper fittings. Essentially, that should be plumbed into the intake after the MAFS and before the throttle body.

[Kingtal0n]

Originally Posted by CarRamrod

Proper PCV system can include a catch can. A factory PCV system + a catch can is an even better option than a factory PCV system that does not include a catch can.

The word PCV means "positive crankcase ventillation" There is no "catch can" in the word PCV nor is it implied or necessary.

[CarRamrod]

Originally Posted by Kingtal0n

The oil doesnt sit in a can, waiting for the operator to empty it out every so often, the way aftermarket cans are intended to be used. Big difference between hands free operation and aftermarket toilet bowls.

Who cares where the vapors and oil that a catch can catches sit? As long as I don't have them in my oil, crank case or intake, I'm happy. So what if you have to drain it out once in a while? If you're running a custom setup like a SR swap for example and you don't want to have to work on it then I suggest you go buy a Honda accord. I hear they have great warranties.

Toilet bowl is a perfect description for a catch can. It catches all the shit you don't want in your motor haha.

Originally Posted by Kingtal0n

The word PCV means "positive crankcase ventillation" There is no "catch can" in the word PCV nor is it implied or necessary.

Ok, now you're just plain reaching here. Arguing that a PCV system doesn't function better or the same with a catch can or that it isn't proper when you add a catch can is just ridiculous. A catch can is an added layer of protection.

Why not tell people to not upgrade their exhaust after adding a bigger turbo? Sure a bigger, more efficient exhaust isn't required but it will improve the over all performance of the engine after the larger turbo is added. Same with the PCV, we are adding a part that isn't required but recommended to improve the overall functionality and improving protection to an expensive motor.

Bottom line is a properly set up PCV system with a catch can IS an upgrade to your engine. There is no arguing that. I've listed the reasons in my earlier post.

If I can answer any more questions then please let me know.

[Kingtal0n]

Originally Posted by CarRamrod

Who cares where the vapors and oil that a catch can catches sit? As long as I don't have them in my oil, crank case or intake, I'm happy. So what if you have to drain it out once in a while? If you're running a custom setup like a SR swap for example and you don't want to have to work on it then I suggest you go buy a Honda accord. I hear they have great warranties.

Ok, it seems as though you lack science. A vapour, is a gas. A gas is not going to be caught in a catch can. A gas will pass the can and be recycled back into the engine. You cannot "drain a gas from the catch can once in a while."

furthermore, an SR swap is not a "custom setup" it is a stock engine, from a stock car. My 1999 S15 silvia is all original and there is nothing custom about it.

Toilet bowl is a perfect description for a catch can. It catches all the shit you don't want in your motor haha.

very scientific description there, "shit". please define "shit" because right now you are only imagining "shit" in a can somewhere. If there is any "shit" coming out of your engine, I would be worried.