Catch Cans - Again

[AzzurrA]

really? feel free to PM me the details, as i was looking at possibly getting one of them?

[(B1) MR_fanny]

sk, is the one with the filter legal, you know like venting to atmo and also which one would be better the one with the filter or without. im thinkin with for the extra airflow??

im noticing oil stains on the silicone sleeve on the ic piping.

panikin - lookin forward to the pics and diy.

[R33-Japan]

Hey all, I am getting my intercooler and a knock off Greddy catch can. I am getting ready for the install and then i realized I have no idea where the piping for the catch can goes. I have searched around the forums for a bit, but this seems to be one with a lot of knowledge.

btw great explanation on how a catch can pulls the oil from the air. I had a very long and uneducated discussion with a friens on them. (neither were correct)

Thanx for the help

[Sydneykid]

Here is one I prepared earlier, that I found by using the search button....

===================================================

My suggestions for plumbing up a catch can. Yes that's right you have CHOICES, there is not a wrong and a right

Pretty much the same for a RB26DETT, or an RB20DET or an RB25DET or an RB31DET (in my case). But keep in mind there is no "best way", you choose whichever suites your requirements.

I call the choices ;

1. 100% plumb back

2. 50% plumb back

3. Zero% plumb back

Let's try this one, it's the open to atmosphere catch can;

The idea is to only have one connection from the cam covers as they are joined by the standard pipe. The PCV valve and the connection to the inlet before the turbo are blocked off. You can have a return (drain) to the sump form the catch can if you like. Don't T it into the turbo oil return as it is under a bit of pressure and the oil can run up into the catch can.

This one I call the 50% plumb back, because half of the time (no boost times) the air from the catch can is being sucked into the inlet manifold via the PCV valve;

It is not my favourite, because you can still get a bit of oily air into the engine, but since it doesn't go in under boost (the PCV valve is closed then) detonation isn't much of an issue. At least you don't get any oil into the intercooler and its pipework.

The last is 100% plumb back, all of the air goes back into the engine. Some goes via the PCV valve, at times of no boost. When there is boost, it goes back via the inlet system, through the turbo, the intercooler and its pipework. :uh-huh:

The idea is the stainless steel wool, helped by the lower velocity in the catch can, catches the oil and removes it from the air before it goes back into the engine. This is the environmentalists favourite :alien: and is the easiest to get engineered.

PS, the PCV valve on RB25's is screwed into the RHS cam cover. For the plumback options (50% and 100%) you would need to move the PCV valve so it is between the catch can and the plenum.

For RB20's the PCV valve is screwed into the plenum and so it doesn't need to be moved.

Hope that helps:cheers:

[R33-Japan]

Thanx for the pics and the discriptions. Answered everything i needed to know.

R33-Japan

[mattysaidso]

when you see most peoples catch can setups they dont normally alter the PCV valve and conecting hose, so when not under boost they would still be sucking oily air into the plenum as the PCV valve is open, true?

in the 100% plumb back option, could you simplify things and block off both ends of the PCV connecting hose? that way you would just have the one hose to the catch can and one return hose to the turbo inlet. i ask this because in the atmo option the PVC and its conecting hoses are completely blocked off and it stil works fine.

[performance-wise]

This is the style I use' date=' just take the filter off the top and fill 'er up. The hole looks small in the photo but is big enough to fit a stocking in and then, one by one, poke in the stainless steel wool. I don't usually remove it, I simply fill it up with 50/50 kero and metho, slosh around and rince with water.

[img']http://www.micksmetalcraft.com/surgeTanks/show071.jpg[/img]

QUOTE]

SK - What is the diameter of the filter hole?

Ive been checking these CC's out(below) from GCG - bit pricey at $180 delivered COD.

-1000ml

-baffled(unremovable)

Also been checkin these ones out(below) for $90 delivered - bit smaller but half the price!

-800ml

-unbaffled

Which would be better then? :confused:

[[[d a n n y]]]

cant u take of the filter and do what sydneykid did?

stick a old stockign in and shove the steel wool in?

[performance-wise]

Thats what Im thinking. And save myself 90 bucks!

The only real difference is the size by 200ml.

Am curious though- how much steel wool should you stuff in? Does it have to sit on the bottom of the catch can?

Has any one got any pics of the inside of a catch can?

[Abo Bob]

I think people should be aware that steel wool is not the same thing as a stainless steel scourer that you scrub your pots and pans with. It is the latter that you should be using I believe. You fill the can up completely.

[performance-wise]

So how do you do it?

Do you stuff the foot of the stocking in, leaving the ankle bit hangin out and then fill it with steel wool and tie off the end? Does that sound right?

[Sydneykid]

So how do you do it?

Do you stuff the foot of the stocking in, leaving the ankle bit hangin out and then fill it with steel wool and tie off the end? Does that sound right?

You got it, and fill 'er right up to the filter:cheers:

[performance-wise]

Here is one I prepared earlier, that I found by using the search button....

===================================================

My suggestions for plumbing up a catch can.  Yes that's right you have CHOICES, there is not a wrong and a right

Pretty much the same for a RB26DETT, or an RB20DET or an RB25DET or an RB31DET (in my case). But keep in mind there is no "best way", you choose whichever suites your requirements.

I call the choices  ;

1. 100% plumb back

2. 50% plumb back

3. Zero% plumb back

Let's try this one, it's the open to atmosphere catch can;

 

The idea is to only have one connection from the cam covers as they are joined by the standard pipe.  The PCV valve and the connection to the inlet before the turbo are blocked off.  You can have a return (drain) to the sump form the catch can if you like.  Don't T it into the turbo oil return as it is under a bit of pressure and the oil can run up into the catch can.

Thnx SK

Im goin to go the open to atmo method.

I cant really see from your pic properly. the 2 connection hoses from the catch can look like they are both going to the same pipe on the rocker cover? Is that right? If so, How do you connect the 2 hoses? And how do you block off the other 3 areas that you outlined?

thnx.

[Sydneykid]

Thnx SK

Im goin to go the open to atmo method.

I cant really see from your pic properly. the 2 connection hoses from the catch can look like they are both going to the same pipe on the rocker cover? Is that right? If so, How do you connect the 2 hoses? And how do you block off the other 3 areas that you outlined?

thnx.

That's one hose from the LHS cam cover to the can (that's why the label says "connection hose" not "connection hoses"), I couldn't be bothered colouring it in.

As for blocking off, Clark rubber has a slection of bungs, and I use the standard clamps. A bolt of the right diameter and thread is the go for replacing the PVC valve.

[performance-wise]

What do you do with the second opening on the catch can if connecting only one hose?

Ummm - PCV valve?? Yes - my cats breath smells like cats food!! I am stoopid.

Sorry for the lame questions.

[Sydneykid]

What do you do with the second opening on the catch can if connecting only one hose?

Ummm - PCV valve??  Yes -  my cats breath smells like cats food!! I am stoopid.

Sorry for the lame questions.

PCV = Positive Crankcase Ventilation

PCV Valve = a one way valve that allows the crankcase to breath into the plenum when not on boost. On boost the valve closes, otherwise the boost pressure would escape from the plenum and go into the crankcase.

If you have a catch can with 2 inlets, then it would be wise to plumb the two cam covers to the catch can, one hose from each. If you only want to run one hose then you can buy a neat bung from Clark rubber to block off the other one.

Hope that helps:cheers:

[performance-wise]

Thnx for that info.

Where would I run the hose to on the second cam cover? I can see form your pic where the first one is plumbed to, Im just a bit clouded where to run the second hose.

thnx.

[Ben101]

I hooked up a catch can to the pcv side and plumbed it back in then put a small k&n filter on the rocker side to vent straight to atmo but found that it sucked air in, anyone had this happen to them, thinking it may be the pcv being plumbed back into the system any thoughts

[lukits01]

I think people should be aware that steel wool is not the same thing as a stainless steel scourer that you scrub your pots and pans with.  It is the latter that you should be using I believe.  You fill the can up completely.

So which one are we suppose to use again?

very fine stainless steel wool?

or

stainless scourers we use to scrup out pots and pans?

[williamsf1]

does anyone have a fitted catch tank to a RB26DETT ? I am about to drive out to GCG and buy one, and many thanks to SK I have the pic of the RB25.... however still a little confused!

call it my small brain trying to take in toooo much info!

so if someone can post what to block for the RB26 that would be sweet! oh and I am after the 0% plumback! I am sick of oil in my FMIC!!!

thanks!