daves12secV6

iTrader: (3)

when i di dmy original turbo system,i left the pcv valv hooked up as normal.the v6 cars have the one breathe rline from the valve cover to the bellows infront of the tb.Well when i installed my turbo kit i just threw a reg breather in the valve cover.well it works fine under non boost conditions,but i must admit i am in boost alot.so id like to address this issue with the new engine/turbo setup.though it hasn't cause me any real problems yet,the worst i get is a lil bit of blue smoke when im above 9 psi and above 4,500 rpms.(ive been taking the engine to 6,500)
i figure i could take the breather out and run a line to the turbo inlet.except this would lead to oil getting all over the compressor blades and prolly in all the charge pipes.Do any of u guys use a evac system like this with or without an oil catch can?How well does this work?

or i figure i can just do a reg moroso evac system with the weld in fittings in the ex system.bvut im thinking this wont be to effective.
Anyone with a boosted motor using this type of setup?how well does it actually work?

any other suggestions for an evac system?

TurboedTPI

Im not sure exactly how a 3.1 pcv system is setup, but on my tpi setup, there was a line from the throttle body to the valve cover (fresh air inlet to crankcase) and when i first ran the car with boost i didnt really think about it, so when it got into boost, that line allowed boost pressure into the crankcase, making alot of blowbye. It smoked alot out of the tail pipe, and oil was leaking out the rear main and valve cover gaskets. At first i thought i was screwed and the oil rings couldnt seal with the extra cylinder pressure with boost or something. Because it was fine until i reached boost. Then i realized that pcv line was allowing boost into the crankcase causing oil to blow out of all the seals and rings. So i just plugged the nipple on the throttle body and just put a seprate filter on the valve cover. No smoke or leaks at all since. So if your pcv system is allowing boost to get into the crankcase somewhere, you'll know what the problem is.

daves12secV6

iTrader: (3)

well the v6 pcv system is like this.on the drivers sid evalve cover is the pcv valve conted to a line that runs right into the manifold base.on the passenger sid eit just has a tube into the valve cover that leads into the bellows infront of the tb.
what i did was eliminate the one on the passenger side when i put the turbo on.so when the motor is at 0 vacum or under boost it has nothing to pull air out of the crankcase.
i knew if i hooked the line upto the turbo inlet without a catch can id just be sucking oil into the turbo inlet.
the amount of smoke i get isnt much at all.so i never noticed it till i let a friend drive the car,while i followed in his car,then i looked at some clips of me at the track and notice slight smoke when i would spool the turbo when staged and also a lil bit down track.
im really just wondering what would be my best option to have crankcase ventilation on a boosted motor
either convert the air pump to a vacum pump
build a catch can and hook the one breather to the turbo inlet
or use one of the moroso crankcase vent kits that u weld into the ex system

ttypecamaro

iTrader: (2)

The late 80's thunderbird turbocoupes have a tiny venturi tee that screws into the hot-side of the intercooler (1/8"NPT). One end re-routes back to the air cleaner and the other end produces a vacuum when under boost. I have 4 of those venturies (tees) hiding somewhere from all of the T-bird intercoolers I've bought. I don't use them because blow-by isn't a big concern for me. I have some blow-by, but not enough to care about it. I just use a pcv valve that is uni-directional.

Recaro trans am

iTrader: (1)

Im running a supercharger at 10 psi fully intercooled on my tpi motor. The engine is compleatly build for the blower. I did experence a lot of blow by. The first thing i did was eliminate the pcv valve. pluged the lower intake. Then i took the line off the valve cover to the trotle body. I put a breather in the driver side valve cover and one of those moroso evac kits in the pasenger side of the y pipe, and then ran a -10 an line to a oil catch can with breather to the valve cover.Even under full boost at high rpms i still get a lil bit of blow by but its so small you can hardly notice. (uslay only in videos of me at the track and when i shift. Im intrested if anyone else has run a system like this.

TurboedTPI

I've heard the systems that use the exhaust work good.

askulte

As long as you don't have much of an exhaust after it. It didn't work with the SLP muffler, but did once I fabbed boom tubes.

daves12secV6

iTrader: (3)

yeah i run a full ex system,im just gonna fab up an oil catch can and hook the breather to the turbo inlet

IrocZonNos

I have the symptoms of blowby now because of the misrouting of the vacuum lines. Could you lay out a diagram as to how you have it setup on your car. Also provide details on specific parts needed.

Thanks!

Six_Shooter

iTrader: (2)

I haven't seen a GM A.I.R. pump that can be easily adapted to pull vacuum, but Ford has one that has fittings for both the in and out, I have one in my possesion I plan to adapt for this very purpose, and to create a higher vacuum than a PCV system on it's own could.

Recaro trans am

iTrader: (1)

Well Its really simple. The way it was discribed in my last post is really it. its that simple. The major parts you need to do is 1. take out the pcv and block off the port in the lower intake. 2. take off the p/s tube that goes to the throtle body and block the throtle body port off. Now ive seen a lot off dragsters using a evac on both valve covers but i fould that one is more then ok. 3. i used a kit from moroso i got from summitracing. It comes with the weld in nipple two breathers, and the check valves. I welded the pipe nipple to the crosover pipe for the d/s exhaust just after it turns to the rear next to the driver side down pipe. 4. then ran a -10 an line from it to a oil catch can i also got from summit and then to the breater. and thats it. as exhaust passes by it creates a vac.

I recently switched my exhaust to a set of long tubes and had to buy a new fitting to weld it and found a kit on the jegs websight that is almost like an o2 bung but its at the proper angle to weld it in. may want to consider this kit, for the ease and to take out the guess work.

Damon

I think a lot of guys with boosted motors just have a one-way check valve in the PCV line. Under vacuum it works like a normal PCV system would, but when the motor jumps into boost it can't flow backwards and pressurize the crankcase.

vwdave

I typically use a catch can routed to the exhaust. No problems that Ive noticed on the 5 cars I have set up that way.

Six_Shooter

iTrader: (2)

So you have the vacuum pump connected to the crankcase (valve cover), then the oulet from the pump is attached to a catch can, and then the catch can is connected to the exhaust?

Or Valve cover to catch can to exhaust?

vwdave

That.