electronic PCV system?

[badass3000]

Vac in the valve cover is good
sucking dirty oily air into the lower plenum is not good.
okay so here is my idea.

I dont think its gheto, I will make it look good.
any coments on weather this is a good idea or not?

[Morph166955]

isnt this the purpose of a catch can?

[J-Ville VR-4]

http://www.3si.org/forum/showthread.php?t=152184

I really doubt that a comp fan will produce any significant vacuum in the crankcase. You'd be better off searching around for a vacuum pump specifically designed for crankcase ventilation. I got as far as asking on 3SI (see above link), I'm sure with a little google you can dig up some useful stuff. I think I ran out of money (again) and gave up on the idea for awhile.

[doctorstupid]

What I think would be more beneficial is this:
Valve cover vents connected together then with a T to a 2 port catch can without breather, which is then connected to the preturbo intake plumbing. The catchcan would serve to get most of the oil and combustion gases out of the air, and the pre turbo intake would provide a good amount of vacuum to the crankcase.

Also, in your schematic the presence of breathers will make acheiving actual vacuum near impossible, especially with a computer fan.

[doctorstupid]

I just read J-Ville's link, and that blows my idea out of the water

[Eric_VR-4]

Badass you read my mind.. I was just thinking of doing precisely what you drew! I was also thinking it wouldn't provide enough vacuum. after stumbling on this thread and the one this is linked to it looks like a very worth wile power mod as well.. I was more thinking to eliminate oil vapor that decreases octane.. and also exhaust that gets blown by... some of us like to block off our EGR.. but depending on our ring and valve stem condition are routing exhaust from another source.. pcv. Anyway.. I found this site:

http://www.hardtail.com/techtips/vacuum-pumps.html

Good info. It's on my list now for sure set it up just like your drawing

I also thought THIS site was interesting... if you scroll down the guy installed a vacuum gauge into the oil cap. kewl! you could even run one into the cabin!

and this: "A functional PCV system is even more critical to turbocharged engines. Turbocharged engines generate crankcase pressures far above those experienced by a stock motor. Add to this the less than ideal Saturn PCV system and you have a problem. Simply attaching a filter to the PCV valve will not cut it. The factory PCV system simply isn't up to the task, and unable to keep up, excessive crankcase pressure will result, causing poor piston sealing, blowby, intake charge contamination (which in turn introduces detonation), and ultimately ring damage. And because the Saturn PCV system relies on a vacuum source to operate, it will not function when the engine is under boost. This is because like the whole intake system on a turbocharged engine, it is pressurized when under boost. And since the PCV system is sourced by a vacuum source on the intake manifold....Well, you get the picture. But this is precisely when a PCV system is needed the most. One must find a means to evacuate excess crankcase pressure, which builds exponentially under boost and heavy load. This is where a air pump comes in. By using an airpump you introduce a vacuum to the crankcase. This will evacuate the crankcase gases at a much faster rate and help the piston rings to do their job. With very little crankcase pressure to fight, engine builders car run looser tolerances. With looser tolerances comes less friction and reduced parasitic drag. In addition, this may allow the use of single compression ring piston designs, which is another topic altogether. It is not uncommon for high compression and turbocharged engines to gain as much as 40 wheel horsepower with the addition of an airpump." from here

All kinds of good info out there... this is all new to me.. exciting

[2Mitsus]

Originally Posted by doctorstupid

What I think would be more beneficial is this:
Valve cover vents connected together then with a T to a 2 port catch can without breather, which is then connected to the preturbo intake plumbing. The catchcan would serve to get most of the oil and combustion gases out of the air, and the pre turbo intake would provide a good amount of vacuum to the crankcase.

Also, in your schematic the presence of breathers will make acheiving actual vacuum near impossible, especially with a computer fan.

Interesting timing with this thread-

My small krankvent just failed, basically just turned into a hollow tube; so this is what I just did:

I removed my PCV valve, and both krankvents altogether.

Ran a 3/8" F.I. hose, from each valve cover, to an inline clear fuel filter (to catch any oil residue), to another section of 3/8" FI hose, to each of my turbo intake hose. I capped off my lower intake manifold nipple. I had the same exact thought process as you- vacuum in those hoses would provide vacuum to the crankcase.

I've only done this 2 days ago, and only have driven it once since doing this.
What I found is somewhat strange. After sitting at a traffic light for 30 seconds or a minute or so, when I first take off (even starting to accelerate very slowly), I get a nice puff of oil out the tailpipe (blue smoke).

Any idea what would cause the smoke?

Now that I think of it, I left the valve cover connector hose (on the driver side, above the timing belt area) still connected and didn't cap that off. Maybe I'm losing vacuum through that hose, as its not the factory OEM hose and isn't exactly very tight.

BTW, I'm running blow thru, so any concerns about the MAF and unmetered air are not any issue to me.

I can post pics of my setup if needed.

[Eric_VR-4]

so your using the turbo intake area as vacuum? There was never any conclusive evidence... but a few of us (who chatted about pcv stuff in another thread) decided that that area was not sufficient vacuum. That area on the stock setup is more of a filtered intake for the pcv. Currently my sytem looks like this:
but I want to change it to what we are talkinog about on here.. so I have vacuum while boosting and no chance of exhaust or oil get back into combustion.
By the way.. the front catch can picks up a TON... I wouldn't want that stuff in combustion

[J-Ville VR-4]

Originally Posted by 2Mitsus

Any idea what would cause the smoke?

You simply have no vacuum in the crankcase. The turbo intake hoses pull an insignificant amount of vacuum. You know how when you have a big boost leak people joke around saying that your turbos dont like o pressurize the atmosphere? Well, this is exactly the opposite, your turbos cant suck in enough air to create a vacuum in the atmosphere.

The reason I believe there is smoke (here's my theory part) is because there is no vacuum in the crankcase to suck on the oil over the valve stem seals. As you know, our shitty valve stem seals leak. Well they leak when oil seeps past the seals, travels down the valve shaft, and into the combustion chamber. The oil then burns and creates smoke. You need vacuum in the crankcase to suck the oil on the valve stem seals away and not let it seep down the valve shafts.

[FaceGarden]

There is a surplus store around here that often has used vacuum pumps from various industries, I saw one today for $20 that would probably pull a strong vacuum. They have a website: www.halted.com but the just added the whole online catalogue recently, so I'm not sure how complete it is. Anyway, have a look there, surplus would be the way to go for low cost.
-Taylor