PCV WTF

boro · Post by **boro** » Sun Apr 15, 2007 11:42 pm

Can I remove the PCV System and replace with breather filters?

gto7419 · Post by **gto7419** » Mon Apr 16, 2007 4:14 am

You *CAN* do this, and I have seen pictures using atmospheric filters while dumping the rest of the pcv system.

I dont know why, but the advice I got was to plumb the pcv system correctly and not use filters.

Can anyone else chime in here???

boro · Post by **boro** » Mon Apr 16, 2007 1:48 pm

I'd really like to know...

kleinkid · Post by **kleinkid** » Mon Apr 16, 2007 10:03 pm

I have two catch cans to use that have two inlets and an outlet with a small vent filter on each one. I don't anticipate any problems.

boro · Post by **boro** » Mon Apr 16, 2007 11:20 pm

Do you mind whipping up some sort of diagram as to how you are going to run this set-up? Apparently Subaru doesnt even know that my car exists...

gto7419 · Post by **gto7419** » Tue Apr 17, 2007 12:04 am

Basically, he is using a catch can to catch any overflowing oil and then venting to the atmosphere - probably a good alternative...

You have an air/oil line feeding out of the heads for the pcv system - He ran those two line outs into the "line in" of the catch can. On the "line out" of the catch can, he put an atmospheric filter.

Danny

boro · Post by **boro** » Tue Apr 17, 2007 2:29 am

gto7419 wrote:Basically, he is using a catch can to catch any overflowing oil and then venting to the atmosphere - probably a good alternative...

You have an air/oil line feeding out of the heads for the pcv system - He ran those two line outs into the "line in" of the catch can. On the "line out" of the catch can, he put an atmospheric filter.

Danny

understood. now can I just cap the crank case vent at that point?

douglas vincent · Post by **douglas vincent** » Tue Apr 17, 2007 2:40 am

Run your crank case vent to the catch can as well.

boro · Post by **boro** » Tue Apr 17, 2007 2:43 am

douglas vincent wrote:Run your crank case vent to the catch can as well.

Yeahm I just found a 3 input tank.

Post by **Legacy777** » Tue Apr 17, 2007 6:48 pm

I would not recommend venting to atmosphere, and I would not recommend capping any vent line.

Keeping a slightly vacuum on the crankcase will help the piston rings seal better, and help with evacuating the blow-by gasses.

rallysam · Post by **rallysam** » Tue Apr 17, 2007 7:44 pm

I'm not venting to atmosphere or capping anything (I don't think). I've got the two tubes coming from the crankcase breathers into a T and then into the catch can (The T is visible in the lower right). From there, two tubes come out of the catch can to the intake tubing and to the PCV valve.

I think the connections are all to the stock locations, just with a catch can added in the middle to catch the oil. Hopefully mother nature likes me.

boro · Post by **boro** » Wed Apr 18, 2007 12:11 am

BAC5.2 · Post by **BAC5.2** » Wed Apr 18, 2007 12:44 am

Sam's is hooked up correctly. That's the best way to do it, for the reasons that Josh specified.

Venting them all isn't going to destroy anything, but it might increase blowby.

gto7419 · Post by **gto7419** » Wed Apr 18, 2007 3:45 am

BAC5.2 wrote:Sam's is hooked up correctly. That's the best way to do it, for the reasons that Josh specified.

Venting them all isn't going to destroy anything, but it might increase blowby.

You mean for the reasons Josh specified

Thanks for the explanations, definately helps!!!

BAC5.2 · Post by **BAC5.2** » Wed Apr 18, 2007 5:40 am

Ninja!

boro · Post by **boro** » Wed Apr 18, 2007 7:05 am

Ok, lets imagine I don't have any of my stock lines...because well, I don't. They are all broken. Would this work?

boro · Post by **boro** » Thu Apr 19, 2007 1:25 pm

any thoughts on this plan?

IronMonkeyL255 · Post by **IronMonkeyL255** » Thu Apr 19, 2007 2:49 pm

boro · Post by **boro** » Thu Apr 19, 2007 11:25 pm

hmmmm, interesting. Thanks.

Post by **Legacy777** » Fri Apr 20, 2007 3:49 pm

Due to space constraints I built some inline foam coalescing filters for the valve covers rather then trying to tie into the catch can.

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PCV WTF

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