Effects of rerouting the PCV valve to a catch can?

[MyBeatGSX]

This is really a pleasant surprise.


I just put it in a vice and drilled it out. Its quite a pain to do but with enough abuse the rattlely thing comes out and you have a nice straight fitting, or you can buy a straight fitting and screw it in there.

 

[eclipsegsx1736]

There is so much misinformation in this thread its not even funny.

If you vent your nipple off the VC with a small filter or even to the ground with the pvc still connected to the intake mani, then you'll have problems with unmetered air being sucked back in and then into the intake mani. The proper way to disconnect the pvc system, the way i've been running for over 10,000 miles with no ill effects, is 1) firmly have the nipple on the intake mani covered and leak free then 2) screw a free flowing fitting into where the stock pvc valve is(i modifed a stock pvc valve to be free flowing) followed by 3) unplugging the other vacuum line off the VC from the intake snorkel and finally 4) running both lines to the ground if your cheap, to an uncapped gatorade bottle if your ghetto, or a true ventilated oil catch can.

This allows no unwated air to enter into the engine all at the same time providing better ventilation of crank-case pressure. IE your dipstick will probably stop popping out now if it did before. Now enjoy having a healthier breathing motor.

That's exactly how I have mine for track and daily driving. No unmetered air, my g/rev are right on the money. One possible issue with this setup: In stock form, under vacuum at idle, the vac from the intake pipe sucks out the vapors and fumes that are sitting around inside your valve cover. With the above setup, the vapors and fumes aren't sucked out, they would only exit by crankcase pressure, which might not always be there. The best setup would be the above setup, but then some additional way using vacuum to encourage the fumes to exit the valve cover so they don't contaminate the oil.

 

[Dream On]

How about if you did what you said above, but ran both tubes to a sealed catch can so the oil will sit in the bottom, and then ran another line back into the intake from the top of the can? I wouldn't think the oil would get sucked in, and if it's all sealed, you should have the vacuum present still...Right?

 

[MyBeatGSX]

And yet another PCV variation is born....

 

[TSIfreek]

How about if you did what you said above, but ran both tubes to a sealed catch can so the oil will sit in the bottom, and then ran another line back into the intake from the top of the can? I wouldn't think the oil would get sucked in, and if it's all sealed, you should have the vacuum present still...Right?

There are many people who have reserched this just use the search and you will find more reading than you know what to do with. search PCV.

 

[DROOPY209]

No wonder i was getting great gas mileage on the freeway after my GM MAF-Translator setup and 3" hard metal intake pipe with no emmision fittings....

I had my VC breather line just disconnected and pointing downwards.

I also had some very high fuel trims, low mid and high. Nomatter what i did, they were high. I had way quicker spool, more power, and great gas mileage, but high fuel trims.

I'm gunna hollow out my PCV valve and run it pointed down somehere.

Sorry to highjack, but what type of fitting can I use to cover up the PCV valve fitting on the intake manifold?

I want this fitting to hold boost while I'm doing a boost leak test, so it should handle about 25 psi.

 

[snox135]

I used a vaccum cap and it seals fine.

If you want to create a vaccum to pull to bad air from the crank case, run both lines below the bottom of the car and point the ends towards te rear of the car. The air moving under the car with create a small amount of vaccum in the lines. Or you could route them to a catch can and then one up at the base of your windshield. The more air you have flowing by the exit of the hose the more vaccum will be created.

 

[MyBeatGSX]

Excellent that you mentioned that. That's exactly what I did. I curved the lines around the front of the transmission and they face backwards with the wind. I also plan on putting little hoods over them (think like a cone shape on the end of the hose) to make more of a low pressure zone.

 

[snox135]

You use postive air pressure moving past an orfice to create a vaccum. The high amount of air moving past the end of the hose will create a vaccum.

 

[TSIfreek]

The base of the windshield is a high pressure area.

Yea and you also get fuel fumes going inside the car. I had this problem thought it was a bad fuel leak but was just my catch can breather. I am now runnning a closed system.

 

[SRiz]

does anyone have pics of there "primative Crankcase ventalation" meaning you dont have a pcv valve nor do you use the intake vaccume to suck out fumes... i want to eliminate my PCV system all together and need some ideas of where to run the 2 lines. ( PICS WOULD BE GREAT!)

 

[MyBeatGSX]

I went out and took some just for you.

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The second picture is looking over the top of the intake pipe right at the front of the trans, just under the UICP. What am I saying, you're not stupid, the shift cables are right there you know what you're looking at.

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[SRiz]

wow thanks man .... ill probably use your setup... gotta go buy some bigger vacuume lines then ill be rollin like they did in the 60's NO EMISSIONS!!! I love florida

 

[herblove]

I went out and took some just for you.

You must be logged in to view this image or video.

The second picture is looking over the top of the intake pipe right at the front of the trans, just under the UICP. What am I saying, you're not stupid, the shift cables are right there you know what you're looking at.

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With this setup don't you smell oil/gas vapors at idle if not while driving. I remove my PCV altogether and ran both lines to a ventilated catch can. I smell oil/gas vapor all the time. Do you think if I capped of the filter on the catch can would that help. I mean the vapors would have to go somewhere..

 

[SRiz]

if your gonna run this setup your gonna smell this crap... specially with a catch can cause it right in the engine bay why do you think old muscle cars smell like crap just sitting there and even worse when they take off...im probably just gonna get some lines and run em to the passenger side make them smell it!!!

 

[staticbrainwash]

Or you could do it the right way and (first use proper punct. and grammar) Route everything to a unvented catch can and route it back to the intake like it's supposed to be.

 

[SRiz]

Or you could do it the right way and (first use proper punct. and grammar) Route everything to a unvented catch can and route it back to the intake like it's supposed to be.

you cant start a sentance with OR!!!! and Route isnt capitalized in the middle of a sentance and that sounds like a run on sentance to me... mmmzzzz g2g but ill brb imo I speel and punc. well and gots good grammerz

 

[No_Skillz]

He's doing a better job than you and giving you an alternative that might be better. I am personally a fan of the unvented catch can and intake route.

 

[SRiz]

o and find me a catch can that is sealed and isnt a little piece of plastic that cloggs at the first sign of oil

 

[gixrman]

o and find me a catch can that is sealed and isnt a little piece of plastic that cloggs at the first sign of oil

Heres one by Greddy, a little pricy but you get the point. Have seen many cheaper ones on ebay.
http://www.machv.com/groilcacan.html

Heres a real getto one the Dodge boy thunk up for $20
http://www.neonrick.com/oilair_howto.html

 

[No_Skillz]

You won't have nice people spoon feeding you all the time. The search button is not broken.

I personally have the RRE catchcan. I took off the filter and capped it off. It's a nice piece and is alot cheaper than Greddy.

 

[madman]

I did search, Im no noob. I could not find the specific information that i needed, all i could find were posts saying how to do it but none that stated the effects of doing it. But thanx to this thread I ran the PCV valve stock again.

You probably didn't find this one becuase of the title but this will tell you everything you ever need to know about this subject.

I havn't gone through it since it's been merged with something else but there is a lot of good info. Enjoy

http://www.dsmtuners.com/forums/showthread.php?t=212510

 

[No_Skillz]

That's a biggass thread and I hated it. Basically just read posts by oldman in the last few pages for a general idea if you don't want to look through it.

 

[staticbrainwash]

Are you serious? You are going to correct me on my use of the english language when I even warned you to use it properly, and you STILL do not comply? Wow, nice dude.

And i got my TOTALLY sealed catch can with one inlet from the VC and one outlet to intake on EBAY. It was 20 dollars, metal, came with hoses and brackets.

So DO NOT correct me in the future when you #1, can't comply to site rules, and #2, can't even search a site as common as ebay.

I'm done here now.

 

[DSMunknown]

Isn't there another informative thread regarding this? Oh yeah, here it is:





http://www.dsmtuners.com/forums/showthread.php?t=229338



I knew this one wasn't too long ago.