Crank case evacuation system

[michal740TI]

After reading in this thread,I have decided to go ahead withe the crank to exhaust evac. system.Got some air check valves (free from exhaust shop) and going to weld my fitting in after the cat.
I will report back with some pictures if anyone interested.

[michal740TI]

Ok,everything looks good after the install.My setup is,5/8 in hose from the breather box into a larger 3/4in hose,that is connected into a check valve. Check valve has 3 inch extension welded after the cat in about 45 degree. This took about 3 hours,cost $15 for the hose.
When I plug the hose with my finger,I feel vacuum pulling in and increases with the higher RPM,but I didn't test it with the gauge or under load yet.I have a standard unmodified exhaust system btw.
I noticed that the acceleration is bit better from the stand still.
It looks like this system really works and I can imagine the turbo inlet likes the clean air as well.

[nathaninwa]

Heres a quick sketch of what I make up. The dimenions are fit to where ever i can place the darn thing.

[Magnum TE]

So bumping an old thread, as I tend to do.

I've got a Moroso 25900 system on order. When it gets here I'm not quite sure how I'm going to plumb it.

I have modded the PCV box for duel outlets ALA TF. So I could just run those 2 hoses to my catch can, then run 2 hoses to the exhaust. With this setup I will run a breather filter on the valve cover to allow air flow in as necessary.

I could run one to the valve cover and one to the breather box, both through the catch can... Not sure if I will draw too much vac with this setup...

I could run both to the valve cover through the catch can and Fxxk that breather box. Or have the breather box draw in fresh air as needed.

I'm thinking the first one is the best one, but what all do you guys think.

[nathaninwa]

I thought it was decided that a car with a muffler this doesnt work so well on.

Maybe before you plumb the system, you weld in a small pipe and hook up a vacuum guage just to see if youll get any benefit. And since your running megasquirt, log with an extra map sensor.

[Magnum TE]

Interesting, I figured there'd be good flow but yea I should log it. I might just hack the muffler off at this point I'm done with pretending to be a daily driver. I hope my 3" Borla pro xs flows enough.

Where else could I put it... In the hot side intercooler plumbing, that's going to have back pressure on it too? If I had a external wastegate I could put it in there I suppose.

[doucheNozzle]

Originally Posted by Magnum TE

So bumping an old thread, as I tend to do.

I've got a Moroso 25900 system on order. When it gets here I'm not quite sure how I'm going to plumb it.

I have modded the PCV box for duel outlets ALA TF. So I could just run those 2 hoses to my catch can, then run 2 hoses to the exhaust. With this setup I will run a breather filter on the valve cover to allow air flow in as necessary.

I could run one to the valve cover and one to the breather box, both through the catch can... Not sure if I will draw too much vac with this setup...

I could run both to the valve cover through the catch can and Fxxk that breather box. Or have the breather box draw in fresh air as needed.

I'm thinking the first one is the best one, but what all do you guys think.

I'm using this as well. However, I'm just running the one and I'm going to stick it post O2 sensor. Although the thought of putting it in my wastegate pipe has me thinking. No wait. That won't work. It needs to see constant flow.

Nathan's point about the exhaust is kinda true. The system will not work with a chambered muffler. Too much back pressure.

Can you elaborate on sticking a vent on the valve cover. Why do you think it's necessary? I never thought about it.

[Magnum TE]

Originally Posted by scottyd

I'm using this as well. However, I'm just running the one and I'm going to stick it post O2 sensor. Although the thought of putting it in my wastegate pipe has me thinking. No wait. That won't work. It needs to see constant flow.

Nathan's point about the exhaust is kinda true. The system will not work with a chambered muffler. Too much back pressure.

Can you elaborate on sticking a vent on the valve cover. Why do you think it's necessary? I never thought about it.

I think the wastegate idea is that the wastegate opens when have the most blow by / cylinder pressure (In boost). Tooling around at >100kpa isn't going to make so much CC pressure.

I'm running a straight through 3" Borla pro-xs? or (some such nonsense) so I hope it's not too much back pressure. I'm going to install both tubes past my cat/test pipe.

The breather on the valve cover is so there won't be too much crankcase vacuum, if the ventui draws more than the windage/blow by is producing.

[doucheNozzle]

Originally Posted by Magnum TE

The breather on the valve cover is so there won't be too much crankcase vacuum, if the ventui draws more than the windage/blow by is producing.

I didn't think there was such thing as too much vacuum.

[lookforjoe]

Originally Posted by Nathaninwa

I thought it was decided that a car with a muffler this doesnt work so well on.

Maybe before you plumb the system, you weld in a small pipe and hook up a vacuum guage just to see if youll get any benefit. And since your running megasquirt, log with an extra map sensor.

I tried this - copied a design I found online. Fitted in the DP below the O2 sensors. Angled following the guides. 3" exhaust with dual 3" magnaflow 14834's.





...and found that I ALWAYS had positive pressure on the test gauge, no matter how I played with the offset/angle, etc.

[lookforjoe]

Originally Posted by Magnum TE

The breather on the valve cover is so there won't be too much crankcase vacuum, if the ventui draws more than the windage/blow by is producing.

I believe the breather on the valve cover will simply become a blow out for your oil, since any pressure will take the easiest exit route....

[740volvo]

Originally Posted by Mad Adder

How many here run one ? I have one on my SVO and just wondered how many on this board use one.

On my N/A 12:5.1 CR redblock I took the black box out made a plate and welded AN fittings, 1" hose runs to an AOS can, I also welded a AN fitting on the valve cover and baffled it, this also runs to the AOS can. Vacuum is being pulled from the exhaust. The bigger the hoes the less chance of oil going through them.

[nathaninwa]

That's why I bought a vaccum pump this time around that can pull 22 inches vacuum if I want! Always on, always working. There is a vacuum limiter, so ill go to about 8 inches. That beats the 3 inches I saw with the ford smog pump.

[lookforjoe]

Nathan, what brand/model pump did you buy in the end?

[nathaninwa]

He GZ motorsports 101a pump.

[740volvo]

I'm going to try that.

[530turbo]

What is the maintenance on that pump? Had an old 2 vain moroso that lasted 3000 miles and came apart. Would love to try a pump again if it will last a while.

[nathaninwa]

I haven't ran it yet. Motors close to getting fired up. Reviews are good. There's no vanes constantly scraping, its a different design, with mileage in mind. Check there website and youtube it, there's a demo showing the differences in pumps.

[Ursan]

More stuff here:

http://forums.turbobricks.com/showthread.php?t=174464

and (lots) here:

http://forums.turbobricks.com/showthread.php?t=256223

[Ursan]

Originally Posted by Nathaninwa

I haven't ran it yet. Motors close to getting fired up. Reviews are good. There's no vanes constantly scraping, its a different design, with mileage in mind. Check there website and youtube it, there's a demo showing the differences in pumps.

Is it still a Volvo engine or a 2JZ or something?

[nathaninwa]

Originally Posted by Ursan

Is it still a Volvo engine or a 2JZ or something?

Its on my 2j, but a universal pump I had to make mounts for. They sell v belt and serp pulleys so it will fit just about any application.

[WindowsBreakerG4]

Originally Posted by 740volvo

On my N/A 12:5.1 CR redblock I took the black box out made a plate and welded AN fittings, 1" hose runs to an AOS can, I also welded a AN fitting on the valve cover and baffled it, this also runs to the AOS can. Vacuum is being pulled from the exhaust. The bigger the hoes the less chance of oil going through them.

Would love to see pix of the build up of your 12:5.1 redblock. Does the 12 to 5.1 work out to like 2:1? I wouldn't think that'd make much power. 200 PSI of boost?

[doucheNozzle]

No it's 12 parts BS, 5.1 parts Regina, 0 parts Turbo.

[Homer]

Originally Posted by 740volvo

On my N/A 12:5.1 CR redblock I took the black box out made a plate and welded AN fittings, 1" hose runs to an AOS can, I also welded a AN fitting on the valve cover and baffled it, this also runs to the AOS can. Vacuum is being pulled from the exhaust. The bigger the hoes the less chance of oil going through them.

Do you have pics of that setup? I'm curious.

[Lando]

Filled in combustion chamber with jb weld and no head gasket. Or heron head with regular pistons and 10mm deep valve reliefs cut with a dremel.