Ok just about ready to put together my rear mount turbo on my 2003 Grand Marquis. All that’s left to do is the cold side from Intercooler to tb. My concern is the valve cover tubes to intake pipe. What are my options for vc venting , oil separators? Simple breathers for both valve covers? I’m in the dark if someone can shed light on this. It’s the factory 2v 4.6 . It has the Adtr.net intake tube. I’m assuming i can’t use the factory type setup with boost. Thanks in advance.

 

There are few options. You can go with a simple catch can that goes from the valve covers to the catch can to just a little breather. You can go from the valve covers to a catch can to the inlet pipe of the turbo to get good vacuum without sucking oil into the turbo. You can go from the valve covers to a catch can to the intake manifold with a check valve for when it's in boost but you'll need get a little creative with the routing.

 

Wow fast reply thank you . So I’m thinking catch can between vc and intake pipe . What kind of fitting would i need to fit on intake pipe ? I have in mind a JLT catch can for a Mustang . Also just to ease my curiosity, i can’t use the factory type setup if i were to reuse my intake pipe i have in there now?

 

Rubber hose is fine, no pressure in this application if you do it on the suction side of the turbo. In the factory application there is no pressure in the intake manifold and the pcv has a constant supply of vacuum. In a turbo application there is intermittent boost in the intake manifold which will be no help to the crankcase. However, in a turbo application there is always vacuum on the turbo suction piping which will evacuate the crank pressure as needed but if there's no catch can between the valve cover and the turbo suction piping then oil will find its way into the inlet of the turbo and coat everything between the impeller to the top of the pistons.

 

Does the fact that my turbo is under the car in rear change anything?

 

I have a vented catch can connected to the oil pan with a -10 hose and 2 breathers on the valve covers. No issues. I dont want any oil breather lines connected to the intake.

 

x2, you need a very good separator to prevent oil in the intake, and the breather setup is simple.

 

So would there be a problem installing the separator in between the intake pipe and valve covers? Or are lines coming out of the intake pipe not good idea with a boosted application? Thanks

 

Anything that creates vacuum (engine vacuum, or vacuum created by the turbo inlet), and is plumbed into the crankcase will have the potential to pull oil vapor. You don't want that vapor in the intake tract for a couple reasons. You'll need a very good separator to prevent the oil from getting to the intake. Some also use the exh flow as a source of evacuation. Most just run breathers, and a catch can, and it works just fine as long as you can prevent a pressure buildup in the crankcase. Evacuating the crankcase (especially in boost) is probably the best in theory, but it's not the easiest to accomplish correctly. Venting is stupid simple, and works.

 

Ok guys thanks. Any other ideas other than the oil pan ?

 

Valve covers are fine.

 

Ok . I’ve been checking out some turbo setup pics online for the 2v and most have one line out of intake pipe to egr valve and the other vc is vented with a filter. This looks like what i may do but maybe add the vented catch can like a Moroso or summit. I hope I’m not over complicating with these questions. Is an oil separator wrong for this application?

 

Exh works well as long as you can control the oil movement... you don't really want oil in the exh any more than you want it in the intake. The key to either setup is a good separator. There are some good debates on the subject here.

 

adequate VC venting works fine for my SC'd inline street car, to keep lower case from pressurizing I also added a 3/4" vent hose ported from the crankcase Fuel Pump block- off plate since it uses an electric fuel pump . Adding a catch can to pass all through next and considering exh' siphoning (bernouli ?) ...

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If you're dead set on tying it to the intake you'll want a good separator. Some use catch cans and steel wool, and some have better, but you want to keep the oil out of the intake tract.

 

Ok so the Moroso catch can with vent is a good option?

 

An electric vacuum pump is another option.

 

The majority of us just run a catch can connected to both vc's. No pcv, nothing connected to the intake, just the crankcase vented to atmosphere through a catch can.

 

Ok guys thanks for all the info . Now that i know the options I’ll see what’s the best for my application.