I was just thinknig about the PCV system and how it works and I came up with this. I would think it would be best, because you get the best of BOTH worlds. suually people's setups on here have it hooked up via turbo intake only but I would think this doesn't have much vacuum at low bosot levels. So I was thinknig of trying this. This way you ahve vacuum pullnig blowby out ALL the time. Tell me what you guys think or comments on any flaws etc.




The only problem I would see is, I don't know how much vacuum the pre intake pipe of a turbo makes. so with that, if the vacuum is actually sstrong enoghu even if the motor itself is still in vacuum. the turbo might creat enough vacuum to pull open PCV (B) which now opens up a vacuum leak for the intake manifold.

 

Looks like a good system to me.

 

TTT

 

Nice , I don't see why that wouldn't work. I guess the only downside is the extra hose in the bay...Kinda wish H-series' had a black box...

 

It will work assuming the PCV valves work.

 

****** A mang! I like it, i understood this after jus glancing at it, A+ for u! some one try it! Im printing this ****!

 

Why even bother with two? I'm thinking about just plugging the stock line for the PCV, and just running a hose to the vacuum port on my intake pipe... intake pipe never sees boost, always sees vacuum.

 

The only problem with taht is at idle or loew revs, the turbo probably is not spinning fast enough to crate any usable vacuum pressures therfore no crankcase ventilation. My diagram fixes taht problem and provides strong vacuum at idle and low revs/crusing as well. My whole point in trying this is to create a cosntant vacuum no matter what engine load/RPM and this is the best I could ponder :D

 

Oh yes, you guys can add a catch can in there as well if you want. I would either add 2 catch cans, one between PCV (A) and intake manifold, and one between PCV (B) and turbo intake pipe.

OR, the otehr choice is the run one catch can, prefferably with 3 ports, but 2 ports work. for a 2 port catch can, route one of the fittings to the oil seperator, and the other fitting on the can will be a single line that you must split with a "Y" adapter which then goes to both PCV (A) and PCV (B).

Let me know if you need a diagram of this

 

Yes, i have thought about this too. But the thing is, who would want oil vapors going back into there turbo? that would leave build-up of sludge on the turbine if u think about it.

the oil catch can/might be baffled, but it does not mean it will catch everything that comes thru it.

i would like more input about this form of installing a catch can.

 

yeah I realized that. but really, putting a catch can inline is no different then what most ppl do(put catch can between turbo intake pipe and the oil seperator box) I'll draw up a diagram later tomrorow night. gotta goto a car show. hehe

 

Is there anything wrong with the old V8 way of doing things? (i.e. routed into exhaust)...aside from the obvious pollution... you could run a catch can inline with it, also.

 

I did my PCV somewhat the same. The stock PCV hose to the throttle body remains, with a compressor oil seperator inline. The vent hose goes to the vacuum side of the turbo with another seperator. ($12 at Home Depot)

Once again, assuming the PCV valve works, I get full vaccum at partial throttle and do not charge my crankcase under boost.

 

when boost comes on how much pressure can the PCV valve withstand before it begins to leak?

 

That's the problem. PCV valves are not designed to counter boost. They always leak. But they hold back the air enough so that your crankcase isn't pressurized.

Maybe PVC valves from OEM turbo cars are better. It's worth a look.

 

put a check valve in line at the manifold.. i also routed a vacuum line to the exhaust to draw vacuum during full throttle...

 

Yes, the check valves work great.

I wouldn't recommend the line to the exhaust, though, simply because it isn't legal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beepy &raquo;</TD></TR><TR><TD CLASS="quote">I wouldn't recommend the line to the exhaust, though, simply because it isn't legal.</TD></TR></TABLE>

It does work i for one am doing it

if i cared about being legal (inspection wise) i woulnd't be in this hobby

 

aren't check vavles pretty much the same as a PCV valve? or are they stronger. Also wouldn't check valves start to gunk up and stick after a while if tehre is bad blow by considering they are usualyl amde for water or vacuum where as a PCV is actualyl amde for this.

 

depends.. i use the check valves that are used inline w/ the brake booster.. you can ckeck them every now and then for gunk... so far they work for me...

 

Ah cool. so are you using check valves in place of the PCV valves then? Anyone know if theya re strogner or not? if not, I'll just stick with PCV valves.

 

u need to use both..

 

alright.w ell quesiton is now, why bother to use chack vavles when the PCV is ideally the same thing.?

 

You guys need to check out the KrankVent. Do a Google search.

 

I'm really ******* lossed. What's the point of making a connection between the turbo intake piping and intake manifold like the diagram says???