new anti PCV idea - 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 06-26-2008, 09:53 AM   #1
Slowest Progress Ever
Thread Starter
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default new anti PCV idea

So last week I took the vacuum line off my PCV and T'd it into the vacuum line that goes from the breather to the turbo inlet on my 99. The PCV used to vacuum line to the intake manifold, but I was pretty sure when my manifold pressure went to boost it was boosting my crankcase through the PCV. So now it can only go to vacuum, but now I also have oil mist / gases going into my turbo inlet. So I was thinking, (but before I do this I want opinions) about making a catch can idea. Both the PCV side and the breather side going to the catch can, but then having a vacuum line going to my turbo inlet from the catch can. Possibly with a baffle inside the can(to kind of deflect oil mist). The catch can will have a petcock or ball valve to drain the oil when needed. I figure the crankcase should always get vacuum, not just have a breather filter clamped onto my valve cover. But at the same time I don't want oil mist going back into my engine. What do you guys think of this idea?
thirdgen is offline   Reply With Quote
Old 06-26-2008, 10:09 AM   #2
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

So you basically want to create vacuum in the catch can.
Saml01 is offline   Reply With Quote
Old 06-26-2008, 10:16 AM   #3
Slowest Progress Ever
Thread Starter
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default

pretty much...if I baffle or possibly filter the catch can somehow, do you think it will be possible to provide vacuum for the crankcase, but at the same time keep gases / oil mist from goin back into the engine?
thirdgen is offline   Reply With Quote
Old 06-26-2008, 10:17 AM   #4
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,242
Total Cats: 290
Default

Brilliant idea. Of course most of this has been discussed to end on this forum. AAMOF there's an active thread right now (but you knew that), and a group-ish buy on some high end check valves to replace the oe pcv. That way you get to keep that part of the system emissions proper. BTW- the vacuum at your intake/turbo inlet isn't going to be anything near what you'll get at the pcv location with the mani.
m2cupcar is offline   Reply With Quote
Old 06-26-2008, 10:21 AM   #5
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Why not just use the intake manifold like before but get a spring/ball check valve?

This way you get maximum vac and you dont coat your IC pipes in crap because the check valve will always be closed with a spring when out of vac.
Saml01 is offline   Reply With Quote
Old 06-26-2008, 10:27 AM   #6
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

y8s is offline   Reply With Quote
Old 06-26-2008, 10:32 AM   #7
Slowest Progress Ever
Thread Starter
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default

I understand this...the most vacuum pressure comes off the intake manifold. But what about when the intake pressure goes to boost? Then there is no vacuum. The turbo inlet at least has vacuum all the time. Higher turbo outlet boost, higher turbo inlet vacuum, correct? I'd assume the lowest vacuum on turbo inlet would be at idle. I never hooked up a vacuum gauge to the turbo inlet, but what kind of inches of vacuum would you think this would see? I'm just assuming that anything 0 - boost on the crankcase is not good, so that's why I am goin with this "vacuum all the time" theory. Help figuring this out is greatly appreciated.
thirdgen is offline   Reply With Quote
Old 06-26-2008, 10:34 AM   #8
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,242
Total Cats: 290
Default

It's all discussed in that thread (and all the others). Seriously, read it.
m2cupcar is offline   Reply With Quote
Old 06-26-2008, 10:38 AM   #9
Slowest Progress Ever
Thread Starter
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default

Alright, sorry, I was just tryin to make a shortened version, only to answer my questions. Sorry if I "jacked" your thread M2CupCar.
thirdgen is offline   Reply With Quote
Old 06-26-2008, 11:14 AM   #10
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Quote:
Originally Posted by thirdgen View Post
I understand this...the most vacuum pressure comes off the intake manifold. But what about when the intake pressure goes to boost? Then there is no vacuum. The turbo inlet at least has vacuum all the time. Higher turbo outlet boost, higher turbo inlet vacuum, correct? I'd assume the lowest vacuum on turbo inlet would be at idle. I never hooked up a vacuum gauge to the turbo inlet, but what kind of inches of vacuum would you think this would see? I'm just assuming that anything 0 - boost on the crankcase is not good, so that's why I am goin with this "vacuum all the time" theory. Help figuring this out is greatly appreciated.
I doubt theres enough vac at the turbo inlet during boost to matter.
Saml01 is offline   Reply With Quote
Old 06-26-2008, 11:16 AM   #11
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,242
Total Cats: 290
Default

It's not about jacking threads, it's about not spreading subject info across twenty different threads. Why answer questions that have already been answered? especially by current threads?
m2cupcar is offline   Reply With Quote
Old 06-26-2008, 06:53 PM   #12
Slowest Progress Ever
Thread Starter
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default

Alright, I figured out what I need to do, so where can I get these spring / check valves? I need 1 now.
thirdgen is offline   Reply With Quote
Old 06-26-2008, 07:13 PM   #13
Elite Member
iTrader: (21)
 
paul's Avatar
 
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
Default

paul 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 58 Yesterday 10:04 PM
Bizarre connection issue? nick470 MEGAsquirt 1 09-30-2015 11:32 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
Nuke Mars! Joe Perez Current Events, News, Politics 8 09-30-2015 05:41 PM
Foreign powered NB for NASA ST3 and/or E0 d k Race Prep 44 09-15-2015 11:59 AM


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 08:54 PM.