oil separator/ everyone needs one.

[dysan]

Gotcha.

Thanks.

 

[Boozshey]

I thought you read the entire thing... If you did you would have seen this...

Originally Posted by JDM's owner
There is no right or wrong with oil seperators. We just choose not to use them because to make it work properly you have to have a sealed system. What I mean by sealed system is no breather caps or any other evacuation device hooked to the engine. Some of the oil buildup in the supercharged cars is from reversion on decel. These motors are extremely tight and on hard decel you can pull 30 inches of vaccuum, which will allow oil to be sucked back through the guides. With a sealed system that will still occur. With an oil breather cap, that will not occur. If a car is running enough power, say 500whp+, we will stick a breather cap on it. This helps two things. 1 is to control the oil being sucked through the guides on a hard decel and 2 pressure or boost that seeps past the rings will get blown out the breather cap. Once oil goes past the guides, it actually goes back up through the intake tract and gets sucked up into the supercharger. On a sealed system, under hard accel, as soon as you shut the throttle body, the motor is going to do everything it can to pull air from somewhere. The path of least resistance is the crankcase - it will pull it past the rings, from the PCV system, and even from the rear main seal - with the breather cap, you're giving it a path of least resistance. It is useless to use an oil breather cap and an oil seperator device because the oil seperator device only works properly on a sealed system. We just chose to use a breather cap so that when the motor needs to pull air, it does it from the atmosphere instead.

We have run tests here on the dyno that shows an oil breather cap cuts nearly 80% of the oil ingestion on a high horsepower supercharged vehicle.

Hope this helps,
Jim @ JDM

 

[dysan]

I did read that caption in 3 different threads but it still doesn't answer if there's any pitfalls of running breathers on N/A cars.

 

[Boozshey]

I am one to sometimes just take trusted advice blindly, this would be one of those times. JDM has such a great track record that I trust with what and have no problem to mimic what they do.

Sorry I can't help you much more than that. Hope some one else can explain.

 

[dysan]

No prob....I do the same thing with stuff and unfortunately have gotten burned. I guess that's why the saying "live and learn" exists.

 

[Boozshey]

If it hadn't come from Jim Sr mouth I would still be asking questions.

 

[dysan]

Question for breather people...I am running a JEGS breather catch can on my driver's side and the metco oil cap breather on the passenger side. From what I have read in the past people seem to catch the oil on the drivers side but I checked the can and it's dry, yet the breather on the oil fill cap is completely saturated with oil.

I'm still N/A at the moment and wondering if this is going to get worse after I get a blower on the engine. I guess I should just get a breather can on the passenger side as well.

 

[AutoXRacer]

I have a JAZ mini breather catch can on both sides and a CFM oil filler breather...
The key is the oil fill breather: http://mustang.c-f-m.com/index.asp?PageAction=VIEWPROD&ProdID=2160&HS=1

The passenger side valve cover needs more venting to avoid an oily filter...

I collect fluid from both sides...
http://www.fnsweet.com/forums/05-09-roush-mustangs/51246-upr-oil-catch-can-7.html

 

[dysan]

Gotcha. Thanks for the reply.

Guess I'll just add another breather can to my list.

 

[Liberty911]

I run valve cover breather and theoil filer breather. Zero oil from anywhere after 3000 miles. I have to pull the intake off this weekend so well so if they are doing their job.

 

[05stroker]

FWIW, the pass side gets more becouse the vent tube on the valve cover is strait though with no check valve while the drivers side does have a one way check valve built into the valve cover .

 

[tbrock]

I have breathers on both sides and an oil filler breather. No oil on drivers side but the passenger side spews oil all over the valve cover. Since I put a oil filler breather it has gotten better. I think for my car an oil seperator on both sides may be the best for me.

 

[dysan]

Well I have the breather catch can on the driver's side but on the passenger side I only have the oil fill breather, no breather on the "PCV" tube. When I get the chance I'm just going to put a catch can on the passenger pcv tube and see if that helps.

 

[08gt4u]

i only get oil from the driver side not the passenger one.

 

[AutoXRacer]

Thats correct, the passenger side vent tube only spews a light oily mist...
Most, of the oil will come from the drivers side.

With my setup, I get substantial amounts of crap from both sides, but no oil.
Its like a watery, fuel smelling, oily fluid with what seems like white grease in it; see pictures in the above link.

I pretty much attribute that to the open filter element of the breather can.
When I had my UPR catch can, it was pure black watery oil...some nasty crap!!!

 

['07 stang]

My passenger side breather spews far more vapor than the driver side. Vent both sides if you don't want that crud in your intake.

 

[07 Boss]

Question for breather people...I am running a JEGS breather catch can on my driver's side and the metco oil cap breather on the passenger side. From what I have read in the past people seem to catch the oil on the drivers side but I checked the can and it's dry, yet the breather on the oil fill cap is completely saturated with oil.

I'm still N/A at the moment and wondering if this is going to get worse after I get a blower on the engine. I guess I should just get a breather can on the passenger side as well.

The catch can on the driver's side does nothing in an open system. Once you opened the system with the oil cap breather, the driver's side becomes completely useless unless you build up enough crank case pressure to open up the actual PCV valve.

In the original 'closed' system, air was draw in through the passenger side and along with manifold vacuum and crankcase pressure, the junk comes out of the driver's side. With a closed loop system you want to run the catch can on the driver's side to prevent the junk from entering your air/fuel charge.

Once you open up the system via a breather, all of the blow by goes out that opening. That is why in a closed system the junk comes out of the driver's side and when you open it up you get that oil mist coming out of the passenger side. To make a breather set up work out of both valve covers you need to cut out the actual PCV valve from the inside of the cover. It is an integral part of the cover but you should be able to cut it out. You can't have it work both ways. Driver's side catch cans only work with a closed loop system. If you want you can run a catch can to a breather set up on the passenger side to prevent any oil mist. Running a breather on both the passenger cover and oil cap will help reduce the oil mist because the crankcase now has two places to vent instead of the one.

I hope this helps clear up the never ending mystery of breathers.

By the way I run all three breathers and and give the passenger side a quick wipe everytime I'm under the hood.

 

[dysan]

Hrm.....very good info there. So am I endangering the engine the way I have it set-up now? If I am I can put the set-up back to stock for now and when I get a chance I'll modify the driver's side cover to get that integrated PCV out.

 

[07 Boss]

Hrm.....very good info there. So am I endangering the engine the way I have it set-up now? If I am I can put the set-up back to stock for now and when I get a chance I'll modify the driver's side cover to get that integrated PCV out.

Endangering your engine? I don't think so. Where do you have the passenger side tube hooked up? If it's on you intake elbow, you might want to check you throttle body. I bet you've been spewing oil out of there too.

 

[dysan]

It's capped off since I have the Metco oil fill breather.