PCV Valve with boost. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 01-31-2008, 11:19 PM   #1
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default PCV Valve with boost.

I have heard different opinions on the stock pcv valve with boost. Will it hold up? Also, is it an emissions thing? I have no emissions testing and if it is something i can just plug up then its not going to be a problem. Thanks!
wes65 is offline   Reply With Quote
Old 01-31-2008, 11:27 PM   #2
Elite Member
iTrader: (12)
 
Join Date: Jan 2007
Location: Hermosa Beach, CA
Posts: 2,575
Total Cats: 11
Default

mine held up for about a month then failed. I now have a factory GTX PVC valve, works great.

Another option is a catch can, just do a search.
cardriverx is offline   Reply With Quote
Old 01-31-2008, 11:33 PM   #3
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

I went into advanced today to check out PCV valves to replace the plastic one i have that doesn't leak. Every single one including the all metal ones they have leaked. The point of the PCV is to remove vapor and pressure from the crankcase. You don't want your PCV leaking boost into the crankcase though.
cjernigan is offline   Reply With Quote
Old 01-31-2008, 11:38 PM   #4
Elite Member
iTrader: (24)
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 3,778
Total Cats: 35
Default

My factory PCV valve crumbled when I tried removing it. After scavenging the pieces out of the valve cover baffle, I just left the hole open. I need to throw a filter on there or get GTX one.


I agree with Cjernigan, don't get one from the autoparts store. This would be a dealer item.
Bryce is offline   Reply With Quote
Old 01-31-2008, 11:43 PM   #5
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,353
Total Cats: 1,319
Default

323GTX from the dealer.
Savington is offline   Reply With Quote
Old 01-31-2008, 11:57 PM   #6
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Quote:
Originally Posted by Savington View Post
323GTX from the dealer.
Agreed. Dont skimp. Heres the part numbers " E301-13-890A ".
Saml01 is offline   Reply With Quote
Old 02-01-2008, 12:35 AM   #7
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

No need to "don't skimp"... the part is about $10... so cheap it's not even worth discussing when the alternative is having the stock one fail and eject the metal plunger into the rotating valve assembly.

Ask me how I know this.
https://www.miataturbo.net/forum/showthread.php?t=9920
samnavy is offline   Reply With Quote
Old 02-01-2008, 01:38 AM   #8
Junior Member
 
Join Date: Nov 2007
Posts: 98
Total Cats: 0
Default

does this apply to the NBs aswell??/ im kinda scared now
emmi is offline   Reply With Quote
Old 02-01-2008, 01:45 AM   #9
Senior Member
Thread Starter
iTrader: (7)
 
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,371
Total Cats: -1
Default

but if i just remove it and put a filter on it, its okay?
wes65 is offline   Reply With Quote
Old 02-01-2008, 01:48 AM   #10
Junior Member
 
Join Date: Nov 2007
Posts: 98
Total Cats: 0
Default

Quote:
Originally Posted by wes65 View Post
but if i just remove it and put a filter on it, its okay?
i've seen some video of ppl w/ just have filters on them and i think i see smoke or oil coming out of them under boost (dyno pull) so i guess it should be fine haha
emmi is offline   Reply With Quote
Old 02-01-2008, 10:00 AM   #11
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Quote:
Originally Posted by wes65 View Post
but if i just remove it and put a filter on it, its okay?
Cjernigan has an NB and the stock PCV and he is fine.
Saml01 is offline   Reply With Quote
Old 02-01-2008, 10:29 AM   #12
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Emmi, check the valve you have now. Take it out and blow in each side. If it can leak boost into the valve cover then replace it with a dealer part.
cjernigan is offline   Reply With Quote
Old 02-01-2008, 11:03 AM   #13
Elite Member
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Got a related question... Why not just hook up the PCV valve upstream of the compressor, downstream of the filter? There should still be some vacuum (not sure if it is enough) and no potential of boost leaks.
ZX-Tex is offline   Reply With Quote
Old 02-01-2008, 11:15 AM   #14
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

i got my PCV from NAPA, looks real good and i dont see how the pieces from inside could come out or apart...has anyone tried the one from NAPA or is it the same as the ones from advance or autozone or wahtever....what should i do, get a dealer one or do we have good results with NAPA one...
help me out without scaring the crap out of me
thanks
Dan
Zabac is offline   Reply With Quote
Old 02-01-2008, 11:44 AM   #15
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

I think the blow-by-mouth test is only good for a couple of psi- I mean how many psi can you generate with your mouth? My guess is a lot of these will leak at higher psi, where you need them to work most, and still pass the blow-by-mouth test. I've got a supra turbo third party valve and I suspect it's leaking at higher boost but there's no way I could make it leak by blowing into it. My test will be putting the compressor on it at the desired pressure level.
m2cupcar is offline   Reply With Quote
Old 02-01-2008, 12:07 PM   #16
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

i think the most one can blow by mouth is about 2-3 psi, i tried this on a boost gauge, lol

but i think hooking it up to a compressor is the best way to test one...i may try that with the NAPA GSX PCV
Zabac is offline   Reply With Quote
Old 02-01-2008, 01:56 PM   #17
Junior Member
iTrader: (2)
 
Join Date: Sep 2007
Location: St. Paul
Posts: 132
Total Cats: 0
Default

I've done the mouth test on a digital tire pressure gauge. 3 psi at most and I have strong lungs.

Hook it up to a compressor to see.
xveganxcowboyx is offline   Reply With Quote
Old 02-01-2008, 02:25 PM   #18
Elite Member
iTrader: (24)
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 3,778
Total Cats: 35
Default

Ok girls, lets not see who can blow the best.
Bryce is offline   Reply With Quote
Old 02-01-2008, 02:32 PM   #19
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

I'd be worried if it was a sucking contest
m2cupcar is offline   Reply With Quote
Old 02-01-2008, 04:47 PM   #20
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Quote:
Originally Posted by whaaamx5 View Post
i got my PCV from NAPA, looks real good and i dont see how the pieces from inside could come out or apart...has anyone tried the one from NAPA or is it the same as the ones from advance or autozone or wahtever....what should i do, get a dealer one or do we have good results with NAPA one...
help me out without scaring the crap out of me
thanks
Dan
10 dollar part, known to fail if its a bootleg, and you want to experiment?

Quote:
Originally Posted by ZX-Tex View Post
Got a related question... Why not just hook up the PCV valve upstream of the compressor, downstream of the filter? There should still be some vacuum (not sure if it is enough) and no potential of boost leaks.
Oil saturated gasses will go into the turbo and coat your IC pipes.
Saml01 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
mslabs MS2 - Idle control issue ndragun MEGAsquirt 0 09-20-2015 11:28 PM


Thread Tools

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:11 AM.