Oil seperators and/or breathers on your boosted 3V's?

Black Bullitt · Jul 25, 2016

I am putting a D1 ProCharger on my 08 Bullitt and I'm trying to come up with a clean way of routing an oil separator on each side, or just vent them. From my limited understanding, just straight up venting is not ideal, and neither are 2 oil separators. So what is the set-up you have on your boosted 3V? Thanks for the insight!

weather man · Jul 25, 2016

Moroso works good.

skwerl · Jul 25, 2016

Driver's side is the only side that needs the oil separator. I used the JLT but they don't work so well. I had to use two in series to actually catch most of the oil. The second one caught almost as much as the first.

You can see them here down below the throttle body.

Black Bullitt · Jul 25, 2016

weather man said:
Moroso works good.

This is an option. Looks like passenger and driver side get fed into it. Nice and simple. No issues with blow by or PCV system?

Black Bullitt · Jul 25, 2016

skwerl said:
Driver's side is the only side that needs the oil separator. I used the JLT but they don't work so well. I had to use two in series to actually catch most of the oil. The second one caught almost as much as the first.

So you ran 2 oil separators on the driver side and vented the passenger side? With this way the tubing goes from the valve cover, then the separators, and then into the intake tube?

I currently have the fitted driver side JLT oil separator that goes from the valve cover to the intake manifold. I could cut that up and use it as an option.

weather man · Jul 25, 2016

Black Bullitt said:
This is an option. Looks like passenger and driver side get fed into it. Nice and simple. No issues with blow by or PCV system?

None. You wouldn't believe the amount of water it catches. I am on E85.

skwerl · Jul 25, 2016

Black Bullitt said:
So you ran 2 oil separators on the driver side and vented the passenger side? With this way the tubing goes from the valve cover, then the separators, and then into the intake tube?

I currently have the fitted driver side JLT oil separator that goes from the valve cover to the intake manifold. I could cut that up and use it as an option.

No, the passenger side was not vented. Neither was the driver's side, the breather line ran from the valve cover to the cans to the blower intake elbow. The passenger side ran from the valve cover to the air intake tube.

You either need to run a fully open system or a closed system. You shouldn't run one side open and the other side closed. I ran a closed system and used the oil cans where needed, on the driver's side.

NUTCASE · Jul 25, 2016

This thread made me do some searching.

Apparently my filter breather on the pass side and JLT seperator on the driver side is wrong. I sealed off the breather part of my intake with epoxy and some junk plastic also.

I like the idea of evacuating contaminants at low engine speeds with a closed system, but I think I am going to start searching overflow tanks and go open (102k motor on nitrous)

06 T-RED S/C GT · Jul 25, 2016

skwerl said:
No, the passenger side was not vented. Neither was the driver's side, the breather line ran from the valve cover to the cans to the blower intake elbow. The passenger side ran from the valve cover to the air intake tube.

You either need to run a fully open system or a closed system. You shouldn't run one side open and the other side closed. I ran a closed system and used the oil cans where needed, on the driver's side.

Can you post a pic of how you have the 2 cans routed in series ? I'm not quite sure exactly where your coming from Skwerl :shrug:

skwerl · Jul 25, 2016

06 T-RED S/C GT said:
Can you post a pic of how you have the 2 cans routed in series ? I'm not quite sure exactly where your coming from Skwerl

The pic above is the best I have. Rubber line goes from valve cover to first can, threaded metal tube goes from first can to second can, rubber line goes from second can to intake elbow. I bought the second can used from the forum classifieds and it came with that threaded tube, so I used it.

07 Boss · Jul 25, 2016

NUTCASE said:
This thread made me do some searching.

Apparently my filter breather on the pass side and JLT seperator on the driver side is wrong. I sealed off the breather part of my intake with epoxy and some junk plastic also.

I like the idea of evacuating contaminants at low engine speeds with a closed system, but I think I am going to start searching overflow tanks and go open (102k motor on nitrous)

If you want a closed system you need the passenger side hooked up to an air source AFTER the MAF.

Black Bullitt · Jul 25, 2016

All good info in here so far and validating my initial thoughts. Just seen too many conflicting thoughts and people running things different.

So in my case, if I want a closed system with the PCV intact, the passenger goes to the intake tubing right before the throttle body (MAF is in the intercooler) and the driver side would go through a catch can and right before the procharger.

If I wanted an open system, I would vent both sides and have to gut the PCV.

Am I correct?

skwerl · Jul 25, 2016

Black Bullitt said:
All good info in here so far and validating my initial thoughts. Just seen too many conflicting thoughts and people running things different.

So in my case, if I want a closed system with the PCV intact, the passenger goes to the intake tubing right before the throttle body (MAF is in the intercooler) and the driver side would go through a catch can and right before the procharger.

If I wanted an open system, I would vent both sides and have to gut the PCV.

Am I correct?

Sounds reasonable. FYI I did not get as technical or involved as all that. My intent was not to redesign the breather system so I left it as designed by the engineers. All I did was add a catch can to the driver's side. Except one catch can didn't work, so I added a second can right next to the first. That worked.

As far as where and how the lines are connected, I had no reason to fiddle with any of that. Unless you feel like taking on redesigning the entire breather system then it might be a lot easier to just leave it as originally designed (with the exception of adding a catch can).

For a street driven car I don't really see the need or purpose of eliminating the PCV system. Those that do bypass it and install breathers then have a whole new set of issues to address.

Black Bullitt · Jul 25, 2016

skwerl said:
Sounds reasonable. FYI I did not get as technical or involved as all that. My intent was not to redesign the breather system so I left it as designed by the engineers. All I did was add a catch can to the driver's side. Except one catch can didn't work, so I added a second can right next to the first. That worked.

As far as where and how the lines are connected, I had no reason to fiddle with any of that. Unless you feel like taking on redesigning the entire breather system then it might be a lot easier to just leave it as originally designed (with the exception of adding a catch can).

For a street driven car I don't really see the need or purpose of eliminating the PCV system. Those that do bypass it and install breathers then have a whole new set of issues to address.

I much prefer keeping the PCV system. I just want to make sure I run the hoses correctly as to not mess anything up. The more I think about it, the passenger side should also be ran to right before the procharger intake. If I put any tubing to after the supercharger I may end up pressurizing the crank case, which I definitely don't want to do!

skwerl · Jul 25, 2016

Where does Procharger tell you to hook up the breathers?

NUTCASE · Jul 25, 2016

did some more reading. I always thought the PCV valve was to keep vapors going in one direction across the crankcase. This is incorrect. The PCV is to stop a backfire in the intake manifold from entering the crankcase.

In my case I am leaning in the direction that an old motor on nitrous should have an open breather system. Still looking into it though.

As far as my current setup it might not be the best but the car seems to still operate no problem. Just a little food for thought.

BlueDevil · Jul 25, 2016

I have a gutted PCV on driver's side, and a -10 AN line from each valve cover to a Moroso breather tank. Looks good and works great.

Candy10 · Jul 25, 2016

K&N breather on each cover. Done.

Black Bullitt · Jul 25, 2016

skwerl said:
Where does Procharger tell you to hook up the breathers?

It's not very intuitive, but they show just capping it off the PCV, which I don't agree with. I'm either for 2 breathers, or catch cans. I just can't figure out what is best for these cars.

Black Bullitt · Jul 25, 2016

BlueDevil said:
I have a gutted PCV on driver's side, and a -10 AN line from each valve cover to a Moroso breather tank. Looks good and works great.

Considered something similar, but I didn't want to have to gut the PCV if I didn't have to.

Candy10 said:
K&N breather on each cover. Done.

I assume that's what you have? Any blow by or tuning issues?

Oil seperators and/or breathers on your boosted 3V's?

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