hey guys, im almost ready to hit the road now, just a few small things left to do and this is one of them

i want to get the whole crankcase venting thing sorted out. i have read almost every post on here about it and none came to any conclusions. so i think i figured it out and i had some help from call911. so tell me what you guys think.

1st- i will be running a -10an line from each valve cover to a dual inlet catch can with a breather.

2nd- i will be running a hose from pcv port on the driver side of the intake through an oil/water seperator down to the suck side of the blower. this will create vacuum at all times to relieve crankcase pressure and th the oil/water seperator will prevent oil from blowing through the blower and onto my maf.

this is a daily driver, not a race car and that is why i think i will go this route, and not the exhaust vac. route with a -10an from each vc to header collector.

is this right , or should i just run the exhaust vac. kit?

 

I personally think the exhaust evac setup is a little extream for a daily driver. I am only running 7 psi of boost, if your running more, you might have to go more extreem. On my car I ran a pass side valve cover on the driverside, and ran the stock pcv valve in the intake. Than in the driverside I put a open element filter venting to atmoshpere, and in the pass side I ran a piece of 1/2 inch hose through a cheapo air/water seperator and down to the suction side of the blower. It seems to work pretty well so far. And with two oil caps, (remember im running two pass side valve covers), if I need more venting, I can just shove a filter in the oil fill and leave that open as a vent as well. Hope this helps, it worked for me. Eric L

 

thanks for the input bud. im just not sure if thatll work for my setup, as i will be running 13-15 psi. and i dont want to be blowing out oil at wot. thats why i want to use a catch can. same thing as the breathers but no oil blowing out on the motor.
also i see your running an air water seperator to the suck side of the blower. how well does it work?

 

so far it seems to work well, and I still have my stock pcv in place for when im not in boost. If I need more evac, I will just put breathers with draft tubes on the oil fills and run the draft tubes under the car. That was how the factory used to evac crankcases years ago.

 

i was just on summit racing and jegs, and the setup i want to run will cost over $200.
if i use the exhaust vac. system, itll cost me $50. and then i could just eliminate the pcv system all together right? doesnt this make more sense. its way cheaper, gets good vacuum at all times and doesnt crowd the engine bay! seems like a win-win situation no?

 

I'm afraid it doesn't work like that.
You need a serious upstream restriction (i.e. closed throttle blades) to pull a vacuum.
It will induce a very small flow, but you won't even see an inch of vacuum unless your air filter is clogged or something.

 

really. i thought that was only on n/a cars, because a f/i car like my blower is sucking air all or the time, even at idle. so therefore it will have even a small amount of vacuum at idle.
i could understand a turbo car not creating vacuum at idle but why not a supercharged car.

 

A partial vacuum would be created if the supercharger was able to suck air out of the pipe at a faster rate than atmospheric pressure could replace it (i.e. due to a restriction).
If you taped up your air filter except for a small area, then yes you could pull a major vacuum. By design, an air filter is a very small restriction.

A small pressure differential that will induce a flow can be created due to the difference in velocity (Bernoulli principle), but unfortunately it's not much.

 

i ran the exhuast evac and it didnt work to well. now i took off the pcv system and put a breather in each valve cover and its working great. make sure your valve covers are baffled or buy the screw in baffles.

 

well having the line from each valve cover to a catch can with a breather is the same as having a breather on ech valve cover but with not oil mist at wot . thanks guys

 

hey guys this is the route i have desided to take. its basicaly an upgraded version of what CALL911 is using. it wokrs great for him and our cars are very similar in setup.so i just ordered my stuff. this is what i will be doing:
step 1:

- 12an male bungs welded on both valvecovers
- 90deg. fitting on both bungs
- braided line from both valvecovers to a 12an T fitting
- braided line from T fitting to a moroso breather tank.

step 2:

-cap off pcv ports on TB and the intake under ther TB.
-run 1/2 hose from pcv port on driverside of the intake ,through a oil/air seperator, to the suck side of the blower.

i have been doing searches on this for a long time now and have desided to go this route. i will update when the car is running.

 

If you read any of my posts about them don't take it too much to heart. I think my first setup with just a seperator vented from the pass valve cover was enough. I thought I was pushing the oil pan gasket out, in fact my rear main housing was not sealing

I'm going to go ahead with the exhaust vac since I have the stuff now... I think it will still do the job nicely, but will put a little oil in the tail pipe.

 

i dont exactly understand what you mean. what exactly was your previous setup. i looked at so many that i cant remember who had what. thanks bud