2GNT.com Forums - Viewing topic - Is it better to run both valve cover vents to a catch can....

Home Site Background Info & Specs Mods & Tech Info CAPS Part Reviews Donate 2GNT Stickers

Printer-friendly copy

2 Users in Chat

Top

2GNT Technical

Turbo/Nitrous Tech

topic #60251

View in linear mode

Subject: "Is it better to run both valve cover vents to a catch can...."

Previous topic | Next topic

ecl98pse	Nov-06-03 04:13 AM
Member since Jan 28th 2002 573 posts,

#60251, "Is it better to run both valve cover vents to a catch can...."

Is it better to run both valve cover vents to a catch can or just one and leave the pcm valve inline running to the intake mani? BTW i'm refering to turboed cars.

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

Replies to this topic

RE: Is it better to run both valve cover vents to a catch can...., Moderator

Corbin, Nov-06-03 06:22 AM, #1

RE: Is it better to run both valve cover vents to a catch can...., HadesOmega, Nov-07-03 08:34 AM, #2

RE: Is it better to run both valve cover vents to a catch can...., Team

DeanoD, Nov-06-03 07:27 AM, #3

RE: Is it better to run both valve cover vents to a catch can...., whodatt1, Nov-06-03 10:22 AM, #4

RE: Is it better to run both valve cover vents to a catch can...., BoostedGS, Nov-06-03 11:25 AM, #5

RE: Is it better to run both valve cover vents to a catch can...., gilee_8, Nov-06-03 11:56 AM, #6

RE: Is it better to run both valve cover vents to a catch can...., ecl98pse, Nov-06-03 02:43 PM, #7

RE: Is it better to run both valve cover vents to a catch can...., zipstrips, Nov-06-03 03:58 PM, #8

RE: Is it better to run both valve cover vents to a catch can...., gilee_8, Nov-06-03 07:03 PM, #9

RE: Is it better to run both valve cover vents to a catch can...., BoostedGS, Nov-07-03 02:41 AM, #10

RE: Is it better to run both valve cover vents to a catch can...., siueclipse, Nov-07-03 08:41 AM, #11

RE: Is it better to run both valve cover vents to a catch can...., Global Ruler Of All Things

DarkOne, Nov-07-03 04:29 AM, #12

RE: Is it better to run both valve cover vents to a catch can...., zipstrips, Nov-07-03 06:07 AM, #13

RE: Is it better to run both valve cover vents to a catch can...., Global Ruler Of All Things

DarkOne, Nov-07-03 06:59 AM, #14

RE: Is it better to run both valve cover vents to a catch can...., zipstrips, Nov-07-03 07:30 AM, #15

RE: Is it better to run both valve cover vents to a catch can...., Team

etx, Nov-07-03 09:36 AM, #16

RE: Is it better to run both valve cover vents to a catch can...., gilee_8, Nov-07-03 11:15 AM, #17

RE: Is it better to run both valve cover vents to a catch can...., zipstrips, Nov-07-03 11:31 AM, #18

RE: Is it better to run both valve cover vents to a catch can...., gilee_8, Nov-07-03 01:15 PM, #19

Corbin	Nov-06-03 06:22 AM
Donating 2GNT member 2552 posts,

#60252, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 0

I have my PCV valve fully sealed and vent the other line on the VC to atmosphere (with a catch can to grab oil). That eliminates the possiblilty of pressurizing the VC with boost (in case of failed PCV valve). That also lets the nasty vapors in the VC vent straight up to the ozone layer. With winter coming, I try to contribute to global warming all I can.

Corbin

'95 ESI-T
HRC+FMIC+ETC...

Gimme fuel...Gimme fire...Gimme that which I desire

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

HadesOmega	Nov-07-03 08:34 AM
Old School 2GNTer 4529 posts,

#60292, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 1

Originally posted by Corbin
That also lets the nasty vapors in the VC vent straight up to the ozone layer. With winter coming, I try to contribute to global warming all I can.

HAHA thats a good one

http://www.hadesomega.info -car specz and movies 95 Eclipse RS | 76' 280Z | 89' MR2 | 99 Neon | 91 Zephyr
Who sez FF can't drift?

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

DeanoD	Nov-06-03 07:27 AM
Donating 2GNT member 1099 posts,

#60253, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 0

I ran both outlets of the VC to the catch can. I then used the outlet in the intake for a dedicated bov source. This made for a very fast reacting bov when I got off the throttle.

Just keep the catch can filter clean and the can drained, otherwise the pressure will have no place to go except out your oil dipstick(if your lucky).

97 RS(PTE SC-61, Built Long Block, Electromotive Tec 3)It's Here!

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

whodatt1	Nov-06-03 10:22 AM
Donating 2GNT member 2531 posts,

#60256, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 3

ditto. both lines go to my catch can and the port in the intake manifold is sealed off.

-97 GS (First project, 299 whp)(sold)
- 97 RS 2.6 last numbers: 306hp, 352tq @16psi (Dead, parted out)
- 99 GS OZ, Hahn Kit, 56k miles (Sold)
--------
- 00 Nissan Maxima GLE (Daily Driver)
- 02 Audi A4 1.8T Quattro

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

BoostedGS	Nov-06-03 11:25 AM
Member since Jun 30th 2002 1329 posts,

#60258, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 4

Originally posted by whodatt1
ditto. both lines go to my catch can and the port in the intake manifold is sealed off.

Yep, same here.

You are not your job.
You're not how much money you have in the bank.
You're not the car you drive.
You're not the contents of your wallet.
You're not your fu**ing post count.

97 Eclipse GS - *SOLD*
01 Audi A6 2.7T
01 YZF-R6

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

gilee_8	Nov-06-03 11:56 AM
Member since Jun 11th 2002 1441 posts,

#60259, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 0

Hye guys..
I am totally lost here.
What is a catch can...and what is it for?

As you guys might know...I just turboed my car...and I dont konw which line has to unplug???

OK, for the intake side, I make the hose coming off the top of the valve cover to the breather filter. Good?

Now, what you guys talking about the PCV valve?? for what?
That's the second hose sticking out of the top of the valve cover right? to the PCV valve to the intake manifold..>I have to take that off too?
SO no more PCV valve?

then should I make both of the hose off the valve cover to the breather filter?

Thanks.
Gil

~~~~~~~~Modification~~~~~~~~
Performance: MegaSquirt v3.0 Fuel & Spark, 8.6:1 JE piston, Eagle Long Rods, SPEC III Clutch, EVOIII B16G, FMIC, Aeromotive 1:1 FPR, Walbro 255HP, 680cc Injectors, 2.5" DP, 3" Magnaflow Cat, 3.5" Greddy EVO CatBack, Greddy Electronic EGT,FUEL,BOOST,A/F gauges...
Interior: Racing Seats, Metallic Interior, 15-Speakers System, Keyless, Dynomat Insulated, Neons...
Exterior: 1999 Body with turbo wing, Halo Projector Headlight, 4300K HID, 17" Mille Rims, GSX Calipers...
Coming Soon: Water Injection, Redo Undercarriage, Repaint Exterior

$240 For New Complete GSX Calipers Kit (Calipers, Bracket, Shim, Pad, Bolts, etc) Email Me If Interested!

1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

ecl98pse	Nov-06-03 02:43 PM
Member since Jan 28th 2002 573 posts,

#60263, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 6
Nov-06-03 02:45 PM by ecl98pse

thanks for the replys guys

a catch can is used to catch oil that is blown out the breather tubes in the valve cover.

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

zipstrips	Nov-06-03 03:58 PM
Member since Nov 06th 2003 6 posts,

#60264, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 7

so if you guys are running catch cans or can, how often do you have to empty them? dont they need a vacuum source? now im new as you guys notice but one of the few who turbod there 7afe (i drive a toyota celica see link for pics and dyno graph...) im having one hell of a time with the pvc system and im looking for some of your expertice. this is bascally the only thing holding me back from saying im complete, which we never really are but the R&D of my turbo would be.

also on my link (to 6gc profiles) you can see what i have done to my vacuum lines for the time being. it has worked fine for a couple weeks actually than went to shit.. its just puking oil out making a mess. thanks emoji

95 celica ST-t.
160hp
170 tq.
www.6gc.net/members/87/

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

gilee_8	Nov-06-03 07:03 PM
Member since Jun 11th 2002 1441 posts,

#60268, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 8

Hi...what is it?
do I HAVE to remove my PCV valve???
From the intake Manifold?
Thanks.

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

BoostedGS	Nov-07-03 02:41 AM
Member since Jun 30th 2002 1329 posts,

#60274, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 9
Nov-07-03 02:42 AM by BoostedGS

Here's a pic of the catch can that RRE sells...

If you only have a small breather filter coming off the valve cover and you're turbo, you'll probably end up with oil all over your engine bay. A catch can just allows the oil to drain without making a mess. I usually empty mine whenever I do an oil change.

The hose going from the back of your valve cover to the intake manifold houses the PCV valve. The PCV valve is actually the little hard plastic piece inline on that hose. If that fails while you're boosting (which we have seen happen), you could create too much crankcase pressure and break things. Removing that PCV valve and running that hose to the catch can is good insurance against that.

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

siueclipse	Nov-07-03 08:41 AM
Member since Nov 28th 2002 3504 posts,

#60294, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 10

Originally posted by BoostedGS
If you only have a small breather filter coming off the valve cover and you're turbo, you'll probably end up with oil all over your engine bay.

I dont run a catch can and have been running just fine for months. No oil or anything. Are you sure you guys arent being paranoid?

James

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

DarkOne	Nov-07-03 04:29 AM
Donating 2GNT member 14955 posts,

#60275, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 8

Originally posted by zipstrips
dont they need a vacuum source?

No.

Originally posted by zipstrips
now im new as you guys notice but one of the few who turbod there 7afe (i drive a toyota celica see link for pics and dyno graph...) im having one hell of a time with the pvc system and im looking for some of your expertice. this is bascally the only thing holding me back from saying im complete, which we never really are but the R&D of my turbo would be. also on my link (to 6gc profiles) you can see what i have done to my vacuum lines for the time being. it has worked fine for a couple weeks actually than went to shit.. its just puking oil out making a mess. thanks emoji

How much oil? If it's large amounts, i'd say check your compression and make sure you haven't hurt the bottom end. a teaspoon full here or there isn't anything to worry about, but a half quart would make me start looing for the compression tester.

______________________________
If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.

'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)

Factory Service Manuals: http://nawdu.de/files/

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

zipstrips	Nov-07-03 06:07 AM
Member since Nov 06th 2003 6 posts,

#60280, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 12

well now reading i may bave a broken pvc.. but it still clicks which mean its working correct? i am trying to reroute the lines todad into a moroso can i purchased today (part number 85465 cost 73.30)... anyways my compression i suspect to be healthy seeing i get vacuum reading from 20 idle and 24-26 when im on the gas driving. my motor has well under 5000miles its whole life. (found it in a yard, the OD read 3k, still had original oil filter and plugs.) it wasnt dumping any oil at all than one day it has a little and sense then it just does it more and more.. i dont have the best of luck.

95 celica ST-t.
160hp
170 tq.
www.6gc.net/members/87/

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

DarkOne	Nov-07-03 06:59 AM
Donating 2GNT member 14955 posts,

#60281, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 13

Take it off and blow through it. the PCV is just a one-way check valve. if air goes through both ways, it's bad.

If you'd rathe rnot worry about it, take the whole pcv valve and tube out, cap the port on the intake manifold, and run both outlets on the valvecover to a catchcan and call it a day.

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

zipstrips	Nov-07-03 07:30 AM
Member since Nov 06th 2003 6 posts,

#60282, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 14

Originally posted by DarkOne
Take it off and blow through it. the PCV is just a one-way check valve. if air goes through both ways, it's bad. If you'd rathe rnot worry about it, take the whole pcv valve and tube out, cap the port on the intake manifold, and run both outlets on the valvecover to a catchcan and call it a day.

would it be ok to take the 2 into a y connector than into the can?

how much smoke should come from the can? i just hook it up, all ports blocked except the pvc, which i did the blow into test, its working, but to 2on on what you said, just the one doesnt seem to release enough, also going around my block like this the car didnt want to go into boost. it sat at 0 or 1 psi. nothing came into the can so i guess that is good. but im afraid the crankpressure was to hi and thats why boost isnt happening.

95 celica ST-t.
160hp
170 tq.
www.6gc.net/members/87/

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

etx	Nov-07-03 09:36 AM
Donating 2GNT member 9740 posts,

#60299, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 15

Ok guys! I was running like most of you for a while. PCV outlet to the air filter to get a little bit of vac and a catch can on the breather (inlet). I decided it was not working properly, I wasn't getting enough vac to vent the crankcase. I hooked the pcv back up to the intake, and since my bov signal was on there I T'ed off the break booster line for my bov. Then i connected the catch can to my breather. I really think the motor is running better now that the crankcase is vented properly. I would not recommend ANYONE disconnect the vac from the pcv outlet. more vacume in the case is going to vent better and help the rings seal properly. If anything I would suggest finding a better check valve to replace the PCV, and if you do let me know because I can't find anything!

Don't remove your pcv system!!! emoji emoji emoji

____________________________________________________
four nails four corners four riders and four horses

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

gilee_8	Nov-07-03 11:15 AM
Member since Jun 11th 2002 1441 posts,

#60304, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 16

OK...
Let me make this clear.
I am turbed...and I boost at 5PSI right now.

So I will have to remove BOTH hoses off the valve cover to the Intake Manifold, and Seal the intake manifold side up.

Then I route BOTH valve cover hose to Y connection to a:
1) Breather Filter (good enough?)
2) Catch Can (if it use to catch oil, won't our car out of oil eventually?)
3) Can we seal the Valve Cover also? (what's the point of the two holes of the Valve Cover for anyway?

Thanks guys.
Now that I read all the above post, it seems like this hose thing is VERY IMPORTANT for a turboed car.... SO I have to have this clear.
Gil

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

zipstrips	Nov-07-03 11:31 AM
Member since Nov 06th 2003 6 posts,

#60305, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 17

Originally posted by gilee_8
OK... Let me make this clear. I am turbed...and I boost at 5PSI right now. So I will have to remove BOTH hoses off the valve cover to the Intake Manifold, and Seal the intake manifold side up. Then I route BOTH valve cover hose to Y connection to a: 1) Breather Filter (good enough?) 2) Catch Can (if it use to catch oil, won't our car out of oil eventually?) 3) Can we seal the Valve Cover also? (what's the point of the two holes of the Valve Cover for anyway? Thanks guys. Now that I read all the above post, it seems like this hose thing is VERY IMPORTANT for a turboed car.... SO I have to have this clear. Gil

gil.. the PCV stands for positive crankcase valve, it is normal to have crankcase pressure. you DO NOT want to plug thoes holes up, the crank needs to let the perssure out, and in some cases lets it in.
-----------------------
i just spent like 2hours reading on pcv systems and crankcae venting.. a link to a good explnation is
www.autoshop101.com/forms/h63.pdf

i luckly found it to be toyota based but the mojority of PCV systems have the same idea, get the positve pressure and HC (hydrocarbons) out.
----------------------
some sites noted that they also are a safey, ie backfires could cause a fire? i think (for my application) i need to leave the PCV in and just clean the thing for 20min in gas. leave the actual PCV valve like factory. and block the breather line from intake manifold and run the other end from the valve cover to the catch can. i hope my troubles are just a dirty PCV.

95 celica ST-t.
160hp
170 tq.
www.6gc.net/members/87/

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

gilee_8	Nov-07-03 01:15 PM
Member since Jun 11th 2002 1441 posts,

#60306, "RE: Is it better to run both valve cover vents to a catch can...."
In response to Reply # 18

OK, so should I unhook both and connect both to a catch can?
Or just the breather Filter is fine for one? or both needed?
THanks.

Report This Post to Admin

Printer-friendly copy | Reply | Reply with quote | Top

Top

2GNT Technical

Turbo/Nitrous Tech

topic #60251

Previous topic | Next topic

Generated in 0.071 seconds, executing 52 queries.