home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > maintenance & nonperformance

Reply
 
Thread Tools Display Modes
Old 04-18-2017, 03:22 PM   #1
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default Opinion on Catch Can for Improved PCV

Hi everyone,

Have a stock b230ft in a 740 with around 250k miles seeing max 10 psi of boost. New oil separator box maybe 30k ago and now running synthetic.

If anyone could give their opinion on the following I would much appreciate the advice. I have been researching this for a while but thought I would ask anyway.

I would like to install a catch can to improve PCV. With the oil fill cap off air is pumping out of the hole there. Dipstick never pops out.

My plan is to go breather box -> catch can -> intake pipe (where the current line runs to for the breather box).
Will this be good enough to increase PVC?

I might start with this and then try to add another fitting off the oil separator to the catch can if above is not enough.

And maybe I drive like a grandma but in the 2 times I've drained the intercooler in the last 50k I get maybe a couple of teaspoons of oil out. Always a little oil in the intake pipes though, throttle body is dry.

Thanks for any advice.
moustacio is offline   Reply With Quote
Old 04-18-2017, 03:36 PM   #2
oldschoolvolvo
Board Member
 
oldschoolvolvo's Avatar
 
Join Date: Mar 2004
Location: Lancaster, PA
Default

Yoshifab offers a nice setup to replace the stock breather box, not cheap but complete.
https://yoshifab.com/store/redblock-...ather-kit.html

You can also piece together your own version if you want something different with these items or other available catch cans on ebay, etc.

https://yoshifab.com/store/2-5-10-catch-can.html
https://yoshifab.com/store/b230-10-a...case-vent.html
__________________
-Mike
1998 V70 T5
1979 242 DL 16v



|Feedback|
oldschoolvolvo is offline   Reply With Quote
Old 04-18-2017, 05:17 PM   #3
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Hey thanks for the links.

Going to be a cheap diy catch can I make.

Are you suggesting, through the first link, that I will also need to run a line of the valve cover to the catch can to get proper crank case ventilation?

Thanks again
moustacio is offline   Reply With Quote
Old 04-18-2017, 05:46 PM   #4
PCH
Board Member
 
Join Date: Oct 2008
Location: Oxnard, SoCal
Default

If you have the head mounted distributor you can install another vent in the engine block where the distributor is on B21-23. Having the vented valve cover or cap is optional- the most important thing is to have the factory breather free flowing and clean.
PCH is offline   Reply With Quote
Old 04-18-2017, 05:48 PM   #5
Ursan
Bored Member
 
Ursan's Avatar
 
Join Date: Jun 2004
Location: Satan's Kingdom, Ma.
Default

http://forums.turbobricks.com/showthread.php?t=256899

http://forums.turbobricks.com/showthread.php?t=256223

Get comfortable, it's a long read.
__________________
Quote:
Originally Posted by 740freak View Post
how psi a stock can support?
Quote:
Originally Posted by speedn_j View Post
So I’m a racist big deal who cares. Deal with it.
Quote:
Originally Posted by Smokeyfan1000 View Post
sorry, Ursan I didn't mean to leave you out.................
**** YOU TOO !
Quote:
Originally Posted by churd9 View Post
I really don’t give a ra what you do but using obtuse sounds GAAAAAAY.
1990 780t Kind of Modded 1994 945t Pegz, Tintz, Hidz.
"Rear Wheel Drive, the way God intended. If a car is being pulled from the front, doesn't that mean it's being towed?"

"Lister, you are a polyp on the anus of society." - A.J. Rimmer
Ursan is offline   Reply With Quote
Old 04-18-2017, 11:50 PM   #6
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Thank you.

So I've read through the threads and am still where I started.

Looks like I will try the catch can and go from there. Unless it would not improve the PCV?

PHC: would I have to tap the block to add such a vent?

Any other opinions welcome, thanks again.
moustacio is offline   Reply With Quote
Old 04-19-2017, 10:00 AM   #7
prometheus_aflame
Board Member
 
Join Date: Oct 2015
Location: Chattanooga, TN
Default

I've looked at Yoshifab's setup and it looks amazing. Is it for NA applications only, or is a different setup needed for turbocharged 940's? I've got a '91 945T.
prometheus_aflame is offline   Reply With Quote
Old 04-19-2017, 10:13 AM   #8
nitroboie
Board Member
 
Join Date: Mar 2009
Location: Charlotte, NC
Default

Same setup can be used for either.
__________________
'90 244
'94 945T ipd cam, springs, sways, brace, 16T, TLAO chips, wasted spark, do88 IC
nitroboie is offline   Reply With Quote
Old 04-19-2017, 11:56 AM   #9
PCH
Board Member
 
Join Date: Oct 2008
Location: Oxnard, SoCal
Default

Quote:
Originally Posted by moustacio View Post

PHC: would I have to tap the block to add such a vent?
.
No. B230's have a plug (like a freezeplug) installed there instead of the distributor. You can get the new plug, install a hose fitting in it and then install it in place of the old one.
I had an old distributor laying around so I sawed the base off of it and installed 1/2 inch barbed nipple where the shaft used to go. I'll get to may car in couple of weeks to take a picture of that mod.
PCH is offline   Reply With Quote
Old 04-19-2017, 05:07 PM   #10
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Thanks PHC.

Didn't realize it was a plug while I was out there.

Is the extra vent there working good for you to improve CCV?

Thanks again
moustacio is offline   Reply With Quote
Old 04-22-2017, 02:00 PM   #11
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Just an idea:

What if I were to run the catch can to a large vacuum hose.

I.e. Breather box -> catch can -> vacuum line to intake manifold

Any problems with this?

Thanks you
moustacio is offline   Reply With Quote
Old 04-22-2017, 02:10 PM   #12
Cwazywazy
Single jingle
 
Cwazywazy's Avatar
 
Join Date: Aug 2016
Location: Granby CT
Default

Quote:
Originally Posted by moustacio View Post
Just an idea:

What if I were to run the catch can to a large vacuum hose.

I.e. Breather box -> catch can -> vacuum line to intake manifold

Any problems with this?

Thanks you
Doesn't work with a turbo and I'd think maybe it'd mess with the idle, depending on how much air goes through.
Cwazywazy is offline   Reply With Quote
Old 04-22-2017, 03:08 PM   #13
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Right on thanks you.

That explains why no one does it that way.

Thanks again
moustacio is offline   Reply With Quote
Old 04-22-2017, 03:11 PM   #14
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Thinking out loud here again but...

Besides the idle would a check valve work?
moustacio is offline   Reply With Quote
Old 04-22-2017, 09:56 PM   #15
Cwazywazy
Single jingle
 
Cwazywazy's Avatar
 
Join Date: Aug 2016
Location: Granby CT
Default

Quote:
Originally Posted by moustacio View Post
Thinking out loud here again but...

Besides the idle would a check valve work?
No because with it closed it'd build up pressure.
Cwazywazy is offline   Reply With Quote
Old 04-29-2017, 04:33 PM   #16
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Thought I would give an update:

So I made a catch can and also added a second vent to the breather box. The second vent is off of the plug looking thing on the updated oil separator (toward the firewall).

So I have it set up as follows: 2 lines from breather box to the catch can to the pre turbo intake. Also have the vacuum line off the "flame trap" hooked up to the original line coming off the box pulling vacuum on the oil separator.

I believe I the pressure is getting better in the crank case but still have air coming out of where the oil filler cap is. One note is that putting a second line off the box where I did was probably not the best idea as there is some oil getting into that hose on its way to the catch can. Have only driven maybe 100 miles so far like this and have a teaspoon of oil or so in said line.

Anyway I'll update again if anything changes or if I decide to try something else.

Thanks everybody.
moustacio is offline   Reply With Quote
Old 05-03-2017, 03:49 PM   #17
PCH
Board Member
 
Join Date: Oct 2008
Location: Oxnard, SoCal
Default

Pic of the added block vent on B230FT:



Sawed off an old B21 distributor I had laying around and installed 1/2" thread 5/8 diameter barbed hose fitting. Will finish building my catch can soon.

Last edited by PCH; 05-03-2017 at 03:57 PM..
PCH is offline   Reply With Quote
Old 05-03-2017, 04:12 PM   #18
lummert
Board Member
 
lummert's Avatar
 
Join Date: Jan 2008
Location: Portland IN
Default

Quote:
Originally Posted by PCH View Post
Pic of the added block vent on B230FT:



Sawed off an old B21 distributor I had laying around and installed 1/2" thread 5/8 diameter barbed hose fitting. Will finish building my catch can soon.
Looks interesting.
__________________
Trying to understand stupid people is like trying to pick up a turd by the clean end.
lummert is offline   Reply With Quote
Old 05-03-2017, 05:16 PM   #19
Tfrasca
Board Member
 
Tfrasca's Avatar
 
Join Date: Apr 2015
Location: Ben Lomond, CA
Default

Quote:
Originally Posted by moustacio View Post
Just an idea:

What if I were to run the catch can to a large vacuum hose.

I.e. Breather box -> catch can -> vacuum line to intake manifold

Any problems with this?

Thanks you
Run the vacuum line to the pre-turbo pipe, which is always in suction.
Tfrasca is offline   Reply With Quote
Old 05-06-2017, 10:54 PM   #20
shaned
Board Member
 
shaned's Avatar
 
Join Date: Nov 2014
Location: Kansas City, MO
Default

Look at Mishimoto, I got a nice 3 port for fair price. the bracket and connectors are cheapish, but the canister is a nice aluminum unit.
shaned is offline   Reply With Quote
Old 05-23-2017, 01:33 PM   #21
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Update:

Put 1,000 or so miles with my catch can installed and it's going great. Still have air coming out of the oil fill but seems better and my leaky engine is getting less leaky (front crankshaft seal I'm pretty sure). Also only pulled a teaspoon of yellow milky oil out of the catch can and intake piping is clean.

Also added a 3rd vent to the catch can as PCH suggested. Fitted a 5/8 OD fitting to the block distributor plug (I have cam dist). Im pretty sure this 3rd vent is helping but this vent is spitting oil into my catch can, about 3 or so teaspoons of dark oil in 150 miles.

Any suggestions on reducing the oil coming from the block distributor plug vent?

Thanks as always for any input.

Last edited by moustacio; 05-23-2017 at 02:46 PM.. Reason: Forgot to add info
moustacio is offline   Reply With Quote
Old 05-23-2017, 01:38 PM   #22
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Forgot to mention, from my post #16 update, that the oil coming from the second vent I added to the breather box was remedied by running the hose more vertically off of the barb fitting I added there.
moustacio is offline   Reply With Quote
Old 05-25-2017, 09:24 PM   #23
moustacio
Board Member
 
Join Date: Mar 2012
Location: Colorado
Default

Another update:

I got the crank case vent that I installed off of the block distributor plug to stop puking oil into the catch can by stuffing some stainless steel wool into the hose just off of my fitting from the dist. plug.

hope this isn't a bad idea somehow. I don't really see how the ss wool could get sucked into the block, but if this a possibility please let me know.

PHC: I don't know how your sawed off distributor vent is set up but if you get it up and running and have oil shooting through this may help?

Thanks everyone
moustacio is offline   Reply With Quote
Old 05-26-2017, 12:47 PM   #24
PCH
Board Member
 
Join Date: Oct 2008
Location: Oxnard, SoCal
Default

No, I don't have the problem with oil spitting out of my vent at all. May be because the distributor housing is basically a pipe that adds to the length of the fitting. It is not routed to the catch can at this time- just has a breather filter on top of the fitting.
I will finish making my catch can this weekend and then see how much oil collects in it.
PCH is offline   Reply With Quote
Old 05-26-2017, 01:22 PM   #25
Cwazywazy
Single jingle
 
Cwazywazy's Avatar
 
Join Date: Aug 2016
Location: Granby CT
Default

I tried a cheapo eBay can but it was too restrictive. (Might be fine now that I've cleaned the oil box, but IDK.) This is what I have now:

Cwazywazy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 03:38 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.