Proper catchcan installation...

[me612]

I again recommend anyone asking questions, to read the entire "Stupid PCV Question" thread I linked to above. Tons of very good information regarding the ideal way to setup a CCV system.

Hooking the lines to a catch can with a breather on it will work, sure. I wouldn't call it ideal though. The ideal method in my opinion is a sealed system, hooked to a vacuum source. With a vacuum source hooked up, it only helps draw out more air which is what you're trying to do, especially on a big power setup that has the potential of having a lot of pressure building up in the crankcase.

Here's a quick diagram of what a sealed, 2 catch can setup would look like. Both with their own vacuum source. I've also attached a picture of mine. I didn't want to take up a bunch of room with 2 catch cans, so JMF built me a custom dual chambered catch can.

 

[woooop]

Just vent it and be done with it. Had to add my 2 cents Im just sick of the same old questions.

 

[Thower]

"Also, with it set up like stock, pressure can't get out via the pcv valve since it is closed.
"

Thats why you use a vacuum source, to hold it under suction....

me612, thanks for the picture, nice looking engine btw. But I am still figuring out how to install one catchcan, let alone run duals...Does JMF offer the dual catch can for sale?

 

[jjgrizz73]

Obviously that setup is fine, even JMFab goes into a small desciption of using their vented catch can for a PCV deletion. I would guess that they are describing the setup like 1992awdlaser was talking about and that will be the way I'll be hooking it up. Thanks alot bud!

 

[Thower]

Sounds good, I am finally understanding the system. Thank you all for bearing with me!

 

[me612]

"Also, with it set up like stock, pressure can't get out via the pcv valve since it is closed.
"

Thats why you use a vacuum source, to hold it under suction....

me612, thanks for the picture, nice looking engine btw. But I am still figuring out how to install one catchcan, let alone run duals...Does JMF offer the dual catch can for sale?

It isn't on his site. I just called him up and told him what I wanted and asked if he could make it for me, and he said sure. If you called him, I'm sure he'd remember making it and would be able to make one for you as well.

 

[420a-t]

If the only vacuum source on you PCV system is the intake pipe, that won't work very well (in the picture posted). For one, you have potentally twice the amount of air coming out of the valve cover (unless the air is being sucked in to replace the icky air, which I don't know how that would work on this system). Your lines are all the same size, if you wanted to get rid of all of the positive pressure, you would want to make the hose diameter bigger going to the intake pipe than the hoses coming off the valvecover.

Also, one of my friends checked the vacuum from an intake pipe and he said it was a whopping 4in/hg on a FP 3065 turbo, not that much.

Also, if you run a vented catchcan and you run dsmlink or AEM EMS, couldn't you compensate for teh extra little bit of air with airflow sliders?

 

[me612]

If the only vacuum source on you PCV system is the intake pipe, that won't work very well (in the picture posted). For one, you have potentally twice the amount of air coming out of the valve cover (unless the air is being sucked in to replace the icky air, which I don't know how that would work on this system). Your lines are all the same size, if you wanted to get rid of all of the positive pressure, you would want to make the hose diameter bigger going to the intake pipe than the hoses coming off the valvecover.

Also, one of my friends checked the vacuum from an intake pipe and he said it was a whopping 4in/hg on a FP 3065 turbo, not that much.

Also, if you run a vented catchcan and you run dsmlink or AEM EMS, couldn't you compensate for teh extra little bit of air with airflow sliders?

I'm not sure if this was directed at me and my setup, but I'm going to assume it was.

I'm not completely understanding what you are trying to say in the first paragraph. I have 2 vacuum sources. The intake pipe (while in boost) or the IM (while in vacuum). You say I have potentially twice the air coming out of the valve cover. Twice the amount of what? Sorry I just don't follow what you're saying.

As for you second paragraph. 4in/hg? That must have been at idle. A decent sized turbo can suck your hand in from a couple feet away. While under boost, there is quite a bit of vacuum being created at the turbo's inlet.

Also, your ECU is expecting your system to still be hooked up like stock. By eliminating the PCV (which at idle usually introduces a very small amount of air into the IM) you have cut off a small amount of air that your ECU has already compensated for assuming it will be there. There are several reports of individuals who have unhooked their PCV system and just vented it, and went back to a sealed system and instantly noticed the cars idle improve.

FYI - I ran a vented setup for years, and just last year decided to research into the topic a bit as I was occasionally popping my dipstick out. Last year I changed to the setup you see in my pic, and running a larger turbo with more boost, I have yet to have the dipstick pop-out. That is my small limited experience, but enough that I will never just vent it again. To me not only in theory does a sealed system just sound better, but last year I actually felt I saw the evidence in my own application that it worked better.

To each their own. I'm just sharing what I've learned, and hope anyone looking into this will take the time and research it like I did, and come to their own conclusions.

Best of luck with your setup.

 

[420a-t]

I didn't see your second line going to your IM, I thought all it had was one line going to the intake pipe. It makes more sense now and that setup should work great. How much did you pay for your catchcan if you don't mind me asking?

Have you tried bigger lines? To me, bigger lines/fittings coming from the valve cover would help more than anything to get the positive pressure out.

 

[Boosted98gsx]

If the only vacuum source on you PCV system is the intake pipe, that won't work very well (in the picture posted). For one, you have potentally twice the amount of air coming out of the valve cover (unless the air is being sucked in to replace the icky air, which I don't know how that would work on this system).

How could one POSSIBLY have more air coming out of their valve cover than what their turbocharger is inducting?

Your lines are all the same size, if you wanted to get rid of all of the positive pressure, you would want to make the hose diameter bigger going to the intake pipe than the hoses coming off the valvecover.

This is accurate. You want, in theory, double the cross sectional area of hose going to your intake pipe as you do coming from your valve cover.

 

[MC23]

I'm not sure if this was directed at me and my setup, but I'm going to assume it was.

I'm not completely understanding what you are trying to say in the first paragraph. I have 2 vacuum sources. The intake pipe (while in boost) or the IM (while in vacuum). You say I have potentially twice the air coming out of the valve cover. Twice the amount of what? Sorry I just don't follow what you're saying.

As for you second paragraph. 4in/hg? That must have been at idle. A decent sized turbo can suck your hand in from a couple feet away. While under boost, there is quite a bit of vacuum being created at the turbo's inlet.

Also, your ECU is expecting your system to still be hooked up like stock. By eliminating the PCV (which at idle usually introduces a very small amount of air into the IM) you have cut off a small amount of air that your ECU has already compensated for assuming it will be there. There are several reports of individuals who have unhooked their PCV system and just vented it, and went back to a sealed system and instantly noticed the cars idle improve.

FYI - I ran a vented setup for years, and just last year decided to research into the topic a bit as I was occasionally popping my dipstick out. Last year I changed to the setup you see in my pic, and running a larger turbo with more boost, I have yet to have the dipstick pop-out. That is my small limited experience, but enough that I will never just vent it again. To me not only in theory does a sealed system just sound better, but last year I actually felt I saw the evidence in my own application that it worked better.

To each their own. I'm just sharing what I've learned, and hope anyone looking into this will take the time and research it like I did, and come to their own conclusions.

Best of luck with your setup.

Just out of curiosity, How exactly is the dual chamber setup inside of one catch can? I agree with the reasoning behind a sealed system and plan to run a similar setup. How much did this custom catch can run you?

 

[me612]

As for right now, all my lines are -6AN (3/8"). In the future I very well may need to increase the size of them, and I expect to have to increase the size. But for now it seems it's fine as is, and I have other things to tend to first, so the -6 lines will stay for now.

Yes, it is kind of hard to see the 4th line that is going to my SMIM. I understand what you were trying to say now. You thought there were 2 lines coming into the can, and only one line out (to the inake). But as you see, that's not the case. Here's a little better angle showing all 4 lines. Also keep in mind my PCV valve is not drilled out, it's a brand new functional OEM one.

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As for my catch can, it cost me $125 from JMF. I'm sure you could get a local, or build your own, for cheaper. I've just had great luck with JMF so he's the first one I went to about it, and it turned out great.

This is the shitty MSPaint drawing I sent him showing him what I was looking for. That should help you understand how it's setup internally.

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[BoostedTT91]

here is the custom catch that JMF built for my galant. the idea came from Jake Montgomery's setup which is exactly how ill be running mine. You can purchase this catch from them for $199

 

[Boosted98gsx]

Here is my can. Old pic, not where I am mounting it, but my cam is being borrowed so I cannot update it. You get the idea. -12 to the intake pipe, and -10 to the valve cover (valve cover -10's not pictured, at the time this picture was taken, things were just being planned out, everything is assembled minus a -10 90* on the "pcv" side of the valve cover):

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[MC23]

here is the custom catch that JMF built for my galant. the idea came from Jake Montgomery's setup which is exactly how ill be running mine. You can purchase this catch from them for $199

Thats a nice "bling" factor piece right there.

 

[Thower]

If i drill out my pcv valve and cap off both the ports on the intake pipe and intake manifold, do i need to modify my stock MAF sensor?