i noticed from threads on the 03/04 boards, the cobra's have the same problem the lightnings did,

just curious, when i had my Lightning, a lot of guys were doing the seperators, but a lot of guys plugged up the pcv going to the intake and just put a breather to vent, i was one of those, and never had a problem

any opinions?

what seems to be the consensus nowadays?

 

Hey Terry, I am running a breather on mine, making 18 pounds of boost, and have had "0" problems with oil in the throttle body.
I am SNKBITE on svtperformance, and 11 SEC SNAKE on modularfords. I have seen you posting on both. Welcome to the group.
Marc

 

i never had a problem with my L running 11's either

with just a breather on

 

I've heard the oil seperators are really popular right now. I like the fact you can empty the oil collector tube when it fills up. I'm not sure where to get them though?

 

with a breather, you just replace the breather if it fills up with oil, but you don't have no where near the vacuum with the breather, so it lasts quite some time

 

Hey beefcake , the more breathers the better on our engines.

I have three, one on each cam cover and one at the oil filler.

 

well , i put a breather on the valve cover, but i think i'll end up with the oil seperator also,

looks like oil will be sucked in from both places

 

your right about that .

I removed my PCV system. I dont vent any crankcase gases into the cylinders along with the oil mist....thats why I have 3 breathers.

I plugged my intake boot (metered air source) and plugged the outlet at the back of the plenum along with the vaccum assist from the lower intake ....easy and helps prevent detonation and I realize the octane rating of the 93 or higher I use.


If you use the combination of a breather and your factory closed PCV system I would get the A/F ratio checked to make sure your not running lean because you are introducing un-metered air into your intake system through your breather.....its probably fine ...

 

i will be back on the dyno for tuning tomorrow,

but yes, you should account for it on the tune,

so, what did you do with the pcv system that runs from the other valve cover to the back of the s/c

 

Go with both, better safe than sorry.

 

dont mix them it defeats the purpose.

Dont lose sight of why we "tinker" with the factory PCV system.

We want to keep "oil mist out of our cylinders" to further reduce the risk of detonation and reducing octane.

Clean air laws route the crankcase ventalation along with oil mist into your engine. So to be safe as you put it, I dont route any of that into my fuel air charge period.

Now the other side is I no longer have the "positive" side of the PCV and that is not a problem because I have 3 breathers to let my close tolerance modern engine vent. I have no issues with my oil (3 changes) and I sent my first change out for analysis(checks for oil cleanliness, presence of wear products, corrosion, etc. etc. and a whole host of other things). I have been sending out oil samples from my IO520 since 1992.... southwest research is in my backyard

 

but yes, you should account for it on the tune

only if you have opened your closed PCV system with the addition of a breather.....introdues air that is not passed through the MAF.


so, what did you do with the pcv system that runs from the other valve cover to the back of the s/c
On my 5.4 passenger side cam cover I added a breather and I plugged the PCV outlet at the back of the plenum. I also plugged the vacuum line that runs to the base of the intake galley.

on the drivers side I plugged the rubber intake boot ....now there is no air going form the drivers side cam cover to be measured at the MAF. And I added a breather at the cam cover.

Running 3 breathers is probably safer to long term reliabilty than all of these kits out there that are supposed keep oil out of the intake because they just redirect airflow or plug lines which can possible cause corrosion build up or premature bearing wear, ...agian we are talking about a modern engine that gets regular oil changes so I dont think incomplete crankcase venting will ever show to be a problem with the guys who run these PCV kits.....But, an undeniable problem is oil in the intake!!! so even with these kits the end result is you are still sending the crankcase gases whether they are heavily laden with oil or not to you cylinders to be burned....I want as much control over my octane rating as I can get.

 

i haven't closed off the entire system, only plugged up the front

i will probably be doing the seperator very soon on the rear

 

that is one "clean motor" beefcake