PCV system on Eaton swap.

[dmjarosz]

Ive searched and searched and can find no deffinate answer on this. Whats the deal with the PCV fitting on the bottom of the eaton lower intake?

The stock setup on the cobra shows it going to a T fitting and connecting to the driver side valve cover and back of the upper intake before the blower.

Reading the manual, it looks like the trillogy setup is the same way as the stock cobra setup.

For the eaton swap, it looks like people plug the fitting on the bottom and just run a hose from the valve cover to the back of the intake.

My questions are: 1) for the stock cobra and trillogy setups, does boost nornally bleed from the lower intake to the back of the intake? 2) What is the downside of plugging the lower intake on the eaton swap? If there is none, why is it there from the fatory? I would think a check valve somewhere in the T fitting would prevent boost from escaping the lower intake.

[RacerX]

Block it off. You don't want pressure going to the pcv system anyhoo. You could run a check valve inbetween. If you know what you're doing, there are a few ways to do it.

http://i2.photobucket.com/albums/y47/blaster250cr/blue%20car/IMG_1841.jpg
http://web.iwebcenters.com/reinhartautomotive/images/session/00-00-1307157162-plugforlowerintake.jpg

[SC Cheesehead]

I'm running a musclemerc catch can tied into a Cobra PCV valve fitted into the DS cam cover.

Top hose on the catch can is routed to the rear of the blower, lower hose is routed to the PCV.

[Dennis Reinhart]

there is very good article about this in my forum

[SC Cheesehead]

there is very good article about this in my forum


True, that! Forgot all about that article, Dennis, very informative. OP definitely needs to check it out.

[justbob]

There is also a good write up from me last year...

[CobraSVT657]

So with this being said... Did Ford engineer it wrong on the 03/04 Cobra's?

[RacerX]

No, you can even use the 03/04 cobra PCV valve I believe. Ours is a POS, well, mine was.

[CobraSVT657]

No, you can even use the 03/04 cobra PCV valve I believe. Ours is a POS, well, mine was.

Cause I set mine up identical to the 03/04 design with the right PCV from a 03/04 Cobra

[SC Cheesehead]

Cause I set mine up identical to the 03/04 design with the right PCV from a 03/04 Cobra

That's what I'm using as well.

[guspech750]

Justbob of Justbob Motorsports solution FTW!!!!
And it clears the EGR and cowl on my Eaton swapped MarauderFTW!!!


http://tapatalk.com/mu/6328b999-8dec-73ca.jpg

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[dmjarosz]

there is very good article about this in my forum

Good read! I'm doing an Eaton swap so some of the info doesnt apply but I get the general idea.


There is also a good write up from me last year...

Also a good write up!


So with this being said... Did Ford engineer it wrong on the 03/04 Cobra's?

With regards to the check valve that closes under boost, no, I think they got it right.
With regards to a lack of a check valve before the T fitting, allowing boost to bleed back into the intake upstream of the blower, yes, they screwed the pooch on that one royally. Theres gotta be a reason why they did it like that though. My guess is emissions, fuel economy, and/or cost. On the other hand, air flowing through a 3/8" diameter (I think) hose at 9 psi isnt really a lot of air. My real concern is that any liquid oil thats in the lines gets blown back into the blower vanes and intercooler.


No, you can even use the 03/04 cobra PCV valve I believe. Ours is a POS, well, mine was.

So does the 03/04 Cobra PCV valve render the entire PCV system inoperable while under boost since the valve closes?

I think my plan going forwad is to plug the bottom port and go with justbob's setup until I get a musclemerc catchcan system in place.

SC Cheesehead, how often do you have to empty the catchcan?

[SC Cheesehead]

Good read! I'm doing an Eaton swap so some of the info doesnt apply but I get the general idea.



Also a good write up!



With regards to the check valve that closes under boost, no, I think they got it right.
With regards to a lack of a check valve before the T fitting, allowing boost to bleed back into the intake upstream of the blower, yes, they screwed the pooch on that one royally. Theres gotta be a reason why they did it like that though. My guess is emissions, fuel economy, and/or cost. On the other hand, air flowing through a 3/8" diameter (I think) hose at 9 psi isnt really a lot of air. My real concern is that any liquid oil thats in the lines gets blown back into the blower vanes and intercooler.



So does the 03/04 Cobra PCV valve render the entire PCV system inoperable while under boost since the valve closes?

I think my plan going forwad is to plug the bottom port and go with justbob's setup until I get a musclemerc catchcan system in place.


SC Cheesehead, how often do you have to empty the catchcan?

No, I believe the ball inside the PCV valve provides is a one-way check from boost getting through from the intake into the driver's side cam cover, but under vacuum the intake draws air through it. If I understan it correctly, the catch can setup does not have any vacuum, so the engine is pushing out all the gases and any oil crud is caught in the catch can. Being no vacuum, it should not be able to suck any unmetered air in through the canister, but should always be pushing it out. The can is baffled/filtered to separate the vapor from the oil.


I've had the unit on the car since early January and no oil even showing in the site glass yet, so I don't anticipate having to empty it often.

[ImpalaSlayer]

Justbob of Justbob Motorsports solution FTW!!!!
And it clears the EGR and cowl on my Eaton swapped MarauderFTW!!!


http://tapatalk.com/mu/6328b999-8dec-73ca.jpg

Sent from my iPhone
Go White Sox!!!
hey nice, you got the egr to fit. did you have to cut anything?

[RacerX]

Actually, if set up properly, you have plenum vacuum drawing air from before the TB (metered open/filtered air) to DS valve cover, through the block to PS valve cover (oil vapor picked up along this route), through pcv one way checkvalve, through oil vapor catchcan (removing oil from air) to Eaton vacuum tube in the middle rear.

[guspech750]

hey nice, you got the egr to fit. did you have to cut anything?



No cutting required. Just a repositioning of the EGR itself and putting back together. Doesn't even touch the cowl!!
We also had to cut, weld and bend the original MM EGR tube to fit.
http://tapatalk.com/mu/a6898f3d-c369-2916.jpg

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[dmjarosz]

Genius! I will deffinately be incorporating that into my Eaton swap. Although I'll probably go with a flex line since I dont have access to a welder at my house. Oh and I suck at welding.

[FordNut]

So with this being said... Did Ford engineer it wrong on the 03/04 Cobra's?

I think they did a lot more research than any of the modders who have blocked it off.


Cause I set mine up identical to the 03/04 design with the right PCV from a 03/04 Cobra

Me too.


That's what I'm using as well.

Good idea.



With regards to a lack of a check valve before the T fitting, allowing boost to bleed back into the intake upstream of the blower, yes, they screwed the pooch on that one royally. Theres gotta be a reason why they did it like that though. My guess is emissions, fuel economy, and/or cost. On the other hand, air flowing through a 3/8" diameter (I think) hose at 9 psi isnt really a lot of air. My real concern is that any liquid oil thats in the lines gets blown back into the blower vanes and intercooler.


I suspect they did it for a good reason. Manufacturers like to minimize the parts used instead of adding needless parts.

[FordNut]

No cutting required. Just a repositioning of the EGR itself and putting back together. Doesn't even touch the cowl!!
We also had to cut, weld and bend the original MM EGR tube to fit.
http://tapatalk.com/mu/a6898f3d-c369-2916.jpg

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Go White Sox!!!

I wonder if that would work on the Whipple?