FORCED 4 breather package

[NavySVO]

What a breeze to install!!

I was taking my sweet time, and it only took me 20 minutes. The hardest part was deciding where to mount the K&N filter.
The amount of hose they supply is around 5', so I routed it around the passenger side shock mount, under the VAF, and onto the frame.
The supplied self-tapping sheet metal screw wasn't going to work in the frame, so I used a wall anchor and screw in the exsisting hole in the frame just forward of the charcoal canister mount.
Thanks Forced 4!
the breather

[NavySVO]

the breather hose outlet from the cam cover

[NavySVO]

and around the shock tower

[Millertime2]

I have had mine for about three years now and it works well except I had to tap my valve cover and install a brass fitting. Otherwise the tube kept popping out and the o-ring supplied would not hold it in place. Now it is bulletproof and a easy mod to do.

[Henson]

Millertime2, lets see it.

[kyle shaw]

What's the purpose of this upgrade? Is thier something wrong with the factory set up? Or are you guy's with bigger turbo's upgrading to this since you cant use the factory elbow.

kyle

[svoman2300]

To keep oil from getting sucked into the intake track.

[gbeaird]

It would look to me, though that with that hose so low in the engine compartment, that you will soon have oil dripping out of the filter. That might get messy. Just a thought.

Gene Beaird
86 2R SVO, G Stock,
Pearland, Texas

[NavySVO]

I see your point, and I thought the same thing, but I haven't had a problem yet........and i keep the filter clean

[AT6svo]

Not only will it get messy at some point, metered air is escaping, probably not enough to notice or even make a difference but the fact remains.

I have an catch can that retains the closed loop system. The catch can is nothing more than a mityvac canister in line from the valve cover to the turbo inlet.

I have a similar system on my SVT Contour for the PVC line...

[NavySVO]

How is it "metered air"? The normal recirc from the stock breather is sucked ito the turbo compressor intake and end up being an oil source. That air is after the VAF Meter........

[bendutro]

What about routing the VC breather through a catch can and then T-ing into the PCV-intake connection. It would allow oil to settle in the catch can and pull a vacuum on the valve cover. (no more VC leaks?)

[AT6svo]

Originally posted by NavySVO
How is it "metered air"? ... ....That air is after the VAF Meter........

Exactly. The ECU has already accounted for that air that has passed through the VAM. Its the same concept in the BOV vs BPV debate (minus the ricer sound effects).

Originally posted by bendutro
What about routing the VC breather through a catch can and then T-ing into the PCV-intake connection. It would allow oil to settle in the catch can and pull a vacuum on the valve cover. (no more VC leaks?)

I like that idea. But lets investigate. If you T'd off below the PCV, you'd have to worry about crank case pressure going back into the VC. if you T'd off above the PCV then the boost (crankcase pressure) issue is gone, but now you have to worry about the boost itself pressurizing the VC. thinking that through, thats probably why it is located where it is, as it shoud still pull a vacuum at the turbo inlet.

True?

[bendutro]

If the T is under the PCV valve, you won't pressurize the valve cover, but you'll still evacuate it. An extra check valve in the catch can line seems wise though, otherwise one failure or leak on the PCV valve and you're blowing oil right through the valve cover gasket.

[Seleucus]

Originally posted by bendutro
If the T is under the PCV valve, you won't pressurize the valve cover, but you'll still evacuate it. An extra check valve in the catch can line seems wise though, otherwise one failure or leak on the PCV valve and you're blowing oil right through the valve cover gasket.

You'd only evacuate it during vacuum. Under boost, the volume of blowby gasses greatly increases, and you'd leave the fumes nowhere to escape. Under prolonged boost, theoretically, trouble might ensue.

You can't pull vacuum on both the block's oil seperator and the VC breather. Vacuum is meant to be applied to only one orifice...the other orifice allows filtered/metered air to be drawn through to help the evacuation process. Equlization between the VC and crankcase occurs via the oil return holes. Theoretically, if vacuum were applied to a sealed crankcase, too much oil would be drawn into the engine, and in time the seals could be sucked in. Under boost with the PCV closed, the fumes are allowed to escape the VC and be drawn in through the turbo, resulting in the undesirable oil deposits.

If you still have a PCV attached to the throttle body and you put a breather on the VC, you're introducing a vacuum leak. It may not be big enough to cause real difficulty, but the more correct solution in a mass air car is to use a quality catch tank inline from the PCV to the inlet. Use on with a pet**** so you can periodically drain it. The breather will also tend to deposit oil under boost.