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Re: Valve cover vent + PCV question


CP
Still lingering, kinda like a chili and beer fart


Galant VR-4 org Post #: 429616 posted 01/13/07 03:41 PM     Remind Me!  Send Private Message   Edit Post      
I'm going to try this for a little while and see if I get any oil in the intake pipe. I put a brass barb in a soft part of my intake pipe, and attached that to an inline filter that feeds from the valve cover vent elbow. So essentially it's setup like stock with a filter:



I ran a straight fitting from the PCV valve hole in the valve cover. This goes to a sealed catchcan. I blocked the opposite hole of the catchcan. Then I ran a hose from the top of the catchcan to a fitting on the intake manfold. There's an inline plastic PCV valve in that hose:



I didn't test for any intake leaks, so I'll be interested to see if that inline PCV valve can hold boost. Any comments? This is by no means permanent, and can be modified pretty easily.



-Cy
Resident Spec Miata Racer | '93 Audi UrS4 | '04 Ram CTD | #1788/2000: SOLD

Posts: 8938 | From: West Simsbury, CT | Member Since: 08/30/04 | IP: (24.61.18.197) | Report this post to a Moderator

atc250r Galant VR4.org Moderator
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Galant VR-4 org Post #: 429621 posted 01/13/07 04:01 PM     Remind Me!  Send Private Message   Edit Post      
At this point you're completely not emissions compliant anyway so I don't get why you don't just vent them both as I recommended. It'd keep the gunk out of your intake tract and your intake manifold, plus it will eliminate any unmetered air from getting into the intake system.

John



"...if they're so into masochism, they should just really go all out and start modifying Mitsubishis. And using them as daily drivers." - Mike R.

Posts: 13235 | From: Orange County, NY | Member Since: 09/11/03 | IP: (70.107.40.78) | Report this post to a Moderator

CP
Still lingering, kinda like a chili and beer fart


Galant VR-4 org Post #: 429623 posted 01/13/07 04:07 PM     Remind Me!  Send Private Message   Edit Post      
I was under the impression that venting the PCV valve (with no vac pulling it open to evacuate) doesn't help draw the crap out of the valve cover. I also thought the air coming out of the valve cover breather tube was metered air that should be routed back into the system.



-Cy
Resident Spec Miata Racer | '93 Audi UrS4 | '04 Ram CTD | #1788/2000: SOLD

Posts: 8938 | From: West Simsbury, CT | Member Since: 08/30/04 | IP: (24.61.18.197) | Report this post to a Moderator

atc250r Galant VR4.org Moderator
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1552/2000


Galant VR-4 org Post #: 429625 posted 01/13/07 04:15 PM     Remind Me!  Send Private Message   Edit Post      
If you replace the PCV valve with a fitting, and vent everything on the VC to atmosphere then you don't have to worry about any metered or unmetered air being involved with the breather system. If you put the hoses off of the VC down near the bottom of the car, the air passing under the car will pull the fumes out of the crank case. Besides, you change your oil often so sludge won't be a problem.

John



"...if they're so into masochism, they should just really go all out and start modifying Mitsubishis. And using them as daily drivers." - Mike R.

Posts: 13235 | From: Orange County, NY | Member Since: 09/11/03 | IP: (70.107.40.78) | Report this post to a Moderator

CP
Still lingering, kinda like a chili and beer fart


Galant VR-4 org Post #: 429632 posted 01/13/07 04:51 PM     Remind Me!  Send Private Message   Edit Post      
Well shit, all that work for nothing. I'm leaving it as is for now.

I had both vented to atmosphere before, through a filter on top of the catchcan (no PCV valve) and it made a mess out the top of the filter. I also got some nice sludgy oil/coolant sperm-looking mix in my catchcan with it setup like that. I don't want that juice blowing all over the bottom of my car. The catchcan should catch anything coming via that route, and I'm hoping the inline filter will catch anything coming out of the valve cover breather before that air goes back into the intake pipe. Everything is dry right now, and I plan to monitor frequently for oil residue. If my intake is getting greased, I'll change things.


Edited by CP (01/13/07 04:55 PM)

Posts: 8938 | From: West Simsbury, CT | Member Since: 08/30/04 | IP: (24.61.18.197) | Report this post to a Moderator

CP
Still lingering, kinda like a chili and beer fart


Galant VR-4 org Post #: 469386 posted 04/25/07 11:36 AM     Remind Me!  Send Private Message   Edit Post   
Update: My valve cover breather hose spits the funk out just ahead of the steering rack down onto the road. The other hose (with PCV valve removed) goes into a catchcan with a filter on top. This setup has resulted in the least amount of spewage from the catchcan filter, and frees up a port on the intake manifold to use for something else.



-Cy
Resident Spec Miata Racer | '93 Audi UrS4 | '04 Ram CTD | #1788/2000: SOLD

Posts: 8938 | From: West Simsbury, CT | Member Since: 08/30/04 | IP: (198.105.0.129) | Report this post to a Moderator


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