Thread: Finding a way to Reduce Oily Blow By Gases

mmm i think the previous owner of my car ****ed me up cos he removed the oil catch can thingy... and did some weird **** to it... gonna have to post a pic!!!

I havent read all responses yet, but I thought I would post. I did today what I had in my original diagram (and what the article discussed) today since I had my PCV valve vented, but the ventilation side still connected to the intake. Now, I have the intake 100% closed off except for idle air and FPR lines. I vented both sides of valve cover (the PCV is just open with no filter cause I only had one but since it's out only I think it's fine). I moved the filter to where the intake hose normally connects. I left the charcoal box as is because the lower case needs that line to stay.

Result is that my idle seems to no longer wanders at all (it used to wander maybe 100 RPM or so slowly). My guess is that it's because I am no longer venting any metered air into the VC, and I am no longer sucking blowby into the intake through that line.

Another thought I had was to connect the PCV valve to an external catch can and then open it to atmosphere to reduce pollution and stop oil from getting on stuff haha.

Just for good measure, here's the pic again:


Covert, the only issue I see with your connecting the PCV out and the ventilation to the same line is that you may not be getting any fresh air into the VC then during ventilation. Of course, it's hard to know whether fresh air is really necessary or not. Also, I am not sure you need any ventilation if the PCV is not connected to the intake manifold? No vacuum means the crankcase pressure might be positive 100% of the time, and no air would flow in anyways.

I think both would work just fine most likely, but I prefer to have a close off intake (I am a fan of simpler is better ). Also, closing the intake line will stop blowby gas from gunking up your TB and manifold, as well as make more room for fresh air that will be more useful to your engine.

Of course, going turbo, that article made a very good point in saying that you don't want the intake connected to crank case at all. That had also never crossed my mind.

Hmm interesting! Good post




So something like this?




EDIT: since this thread took a dive for a different topic, thread name changed

Here is an interesting patent: http://www.patentstorm.us/patents/4768493/description.html

I didn't read it all the way, but it seems like heating the PCV gases might help for something?

Does anyone have an account to view those pictures?

That's pretty interesting as well, keeps it from gunking you up and still gets rid of it in a legal way

Vadim, this is what I meant by a catch can:

Ahh so basically what I have on my car now. Look at some pictures above.

The problem with my current catch can is, its annoying to empty it out LOL.

Thats why I wanted to just run it back to the crank, so that oil could be reused. But that oil might be the oil that causes sludge...

Either way I'm gonna try it out on my way back home!

Hmmm insteresting thread. Have you went to the old forum and went through the ALL MOTOR setup pic thread? That is another good way to get some ideas and ask questions. What's with the tube crossing back over the VC in that diagram in post #33? Also, when did you hook that up in post #29?

The PCV catch can system usually runs a canister from the valve cover, into a canister to hold oil, with a breather on top to release built up pressure.

Factory set ups usually don't have a canister or breather, it just relies on vacuum to get rid of built up pressure, and the oil with it.

You can get a larger can, and empty it less often, but if you're getting a lot of oil blow by, then you need a new engine.

That is awesome.

it's the truth.