UPR valve cover vent.

[Doc]

I thought I posted this.

From the Mustang Forum

“ High boost situations are generally brief so the focus is mainly on when the engine is under vacuum which makes up most of it's time.
The crankcase pressure can overwhelm the stock cleanside PCV though if you have increased boost pressures because of a “Tune” and drive hard for extended periods of time.
The valve cover vent I suggested will alleviate the crankcase pressure spikes during boost and reduce stress on the gaskets (the timing cover gasket is a common one to fail), it has a check ball valve so it is sealed while the engine has negative crankcase pressure avoiding any check engine lights, UPR sells one as well.”

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[Dereku]

Me over here trying to understand why it bothers what other people do to their vehicles and their ?.

He works for the EPA be careful.

 

[Dgc333]

I thought I posted this.

From the Mustang Forum

“ High boost situations are generally brief so the focus is mainly on when the engine is under vacuum which makes up most of it's time.
The crankcase pressure can overwhelm the stock cleanside PCV though if you have increased boost pressures because of a “Tune” and drive hard for extended periods of time.
The valve cover vent I suggested will alleviate the crankcase pressure spikes during boost and reduce stress on the gaskets (the timing cover gasket is a common one to fail), it has a check ball valve so it is sealed while the engine has negative crankcase pressure avoiding any check engine lights, UPR sells one as well.”

The issue I have with that quote is that the PCV valve in a boosted application serves two functions:
1. Under no boost conditions when you have vacuum in the intake manifold it acts as a variable valve to throttle the amount of fumes being drawn from the crankcase, if it didn't you would have a massive vacuum leak. As a matter of fact there was an issue with the early Ecoboost Mustangs where they would smoke at idle. The PCV was not throttling enough at idle and allowed enough fumes to be introduced into the engine that at idle you would see the burning oil as smoke out the tail pipe. The TSB fix was a redesigned PCV valve with a better baffle plate on the side of the block.
2. The second function is to act as a check valve under boost to prevent boost pressure from entering the crankcase. It is here where modified high boost applications could overwhelm the PCV valve causing it to leak and pressurize the crankcase. The solution is not to put a vented filler cap on the engine but to put a check valve with a higher pressure rating in line with the PCV valve to stop the boost pressure from entering the crankcase. This is a pretty popular mod on the Ecoboost Mustang forum.

For emissions compliance the PCV system is a closed loop. There is a "clean" side line that allows filtered air back into the crankcase under vacuum. This line runs from the rocker cover to a point between the air filter and the inlet to the turbo compressor. Under boost when the PCV valve is closed pressure that maybe building up in the crankcase due to blow by is allowed to flow out the "clean" side line and be reintroduced into the engine at the compressor inlet. The line is approximately 1/2" in diameter so it can relieve a lot of volume of blowby but it is possible under modified high boost conditions it can't keep up and a vented oil filler cap could help.

BUT, unless you are out on a road course running at full boost almost all the time the engine is under vacuum about 99% of the time and the second or two each time you accelerate and generate boost I can't see how you would be generating enough blowby to be an issue.

 

[Jason B]

I thought I posted this.

From the Mustang Forum

“ High boost situations are generally brief so the focus is mainly on when the engine is under vacuum which makes up most of it's time.
The crankcase pressure can overwhelm the stock cleanside PCV though if you have increased boost pressures because of a “Tune” and drive hard for extended periods of time.
The valve cover vent I suggested will alleviate the crankcase pressure spikes during boost and reduce stress on the gaskets (the timing cover gasket is a common one to fail), it has a check ball valve so it is sealed while the engine has negative crankcase pressure avoiding any check engine lights, UPR sells one as well.”

Yeah, I saw that post. So, do you have increased boost pressures because of a “Tune” and drive hard for extended periods of time.? If not, it's a waste of money. Quoting a user on another forum doesn't prove that the mod is beneficial. But if you feel it is, good for you.

I also saw this post:

Who cares, if at all there is a change it would be miniscule. If they don’t like their results, just take it off.
Im done with this subject.

Lastly, an oily sock in the engine bay seems like a fire hazard.

 

[Mustang2Ranger]

Well since a bunch of you are asking for

I thought I posted this.

From the Mustang Forum

“ High boost situations are generally brief so the focus is mainly on when the engine is under vacuum which makes up most of it's time.
The crankcase pressure can overwhelm the stock cleanside PCV though if you have increased boost pressures because of a “Tune” and drive hard for extended periods of time.
The valve cover vent I suggested will alleviate the crankcase pressure spikes during boost and reduce stress on the gaskets (the timing cover gasket is a common one to fail), it has a check ball valve so it is sealed while the engine has negative crankcase pressure avoiding any check engine lights, UPR sells one as well.”

Great post. This is the reason I bought mine. I couldn't have said it better

Mine has a slight leak at the rear main seal. It started before I found out there was a TSB on this. Unless it becomes a horrible problem I won't take it to the dealer. So far, no oil added between changes and Blackstone reports look good

Once I changed to the breather the leak almost went away

 

[importfighter01]

The issue I have with that quote is that the PCV valve in a boosted application serves two functions:
1. Under no boost conditions when you have vacuum in the intake manifold it acts as a variable valve to throttle the amount of fumes being drawn from the crankcase, if it didn't you would have a massive vacuum leak. As a matter of fact there was an issue with the early Ecoboost Mustangs where they would smoke at idle. The PCV was not throttling enough at idle and allowed enough fumes to be introduced into the engine that at idle you would see the burning oil as smoke out the tail pipe. The TSB fix was a redesigned PCV valve with a better baffle plate on the side of the block.
2. The second function is to act as a check valve under boost to prevent boost pressure from entering the crankcase. It is here where modified high boost applications could overwhelm the PCV valve causing it to leak and pressurize the crankcase. The solution is not to put a vented filler cap on the engine but to put a check valve with a higher pressure rating in line with the PCV valve to stop the boost pressure from entering the crankcase. This is a pretty popular mod on the Ecoboost Mustang forum.

For emissions compliance the PCV system is a closed loop. There is a "clean" side line that allows filtered air back into the crankcase under vacuum. This line runs from the rocker cover to a point between the air filter and the inlet to the turbo compressor. Under boost when the PCV valve is closed pressure that maybe building up in the crankcase due to blow by is allowed to flow out the "clean" side line and be reintroduced into the engine at the compressor inlet. The line is approximately 1/2" in diameter so it can relieve a lot of volume of blowby but it is possible under modified high boost conditions it can't keep up and a vented oil filler cap could help.

BUT, unless you are out on a road course running at full boost almost all the time the engine is under vacuum about 99% of the time and the second or two each time you accelerate and generate boost I can't see how you would be generating enough blowby to be an issue.

The UPR valve does not impact the PCV components. The PCV ventilates the crankcase into the Intake manifold. The function of the breather tube from the valve cover into the intake tract pre-turbo is what the UPR valve affects.

Under boost the PCV system is not functioning because the check valve in the tubing prevents boost pressure from going into the crankcase. In those scenarios the any pressure from the rotating mass migrates up to the valve cover area and vents into the breather hose and into the intake tract. However the suction of the turbo on the valve cover breather hose is too little to evacuate all pressure from the valve cover. The UPR vent is spraying oil because that’s how much pressure is being stored in the valve cover and trying to exit despite the pressure also exiting via the valve cover breather hose.

The emissions friendly way would be to have an extra breather hose into the intake tract or for Ford to make it larger. However they are also trying to mitigate oil mist into the intake tract because with direct injection engines that mist collects on the valves and sludge forms on them over time reducing performance (hence the walnut blasting valve treatment many DI engine owners do over time). With the next gen 2.3 Ecoboost having dual injection to clean the valves, Ford could create the larger breather hose solution so something like the UPR vent would not be needed, but until then the factory valve cover breather setup is insufficient to vacate engine pressure during certain conditions such as WOT.

 

[yamahaSHO]

Honestly, much of that oil coming out could just be the cams slinging it around up in that area.

If nobody has put a pressure sensor on the crankcase, there's not much point in trying to argue an 'pressure' points and it's all anecdotal.

 

[importfighter01]

Honestly, much of that oil coming out could just be the cams slinging it around up in that area.

If nobody has put a pressure sensor on the crankcase, there's not much point in trying to argue an 'pressure' points and it's all anecdotal.

This is not an open breather. It’s a one way check valve. It’s closed when there is no pressure pushing it open So oil can’t just sling though it. Only way oil exits the UPR check valve is when air pressure carries it out.

And I’m not arguing anything. Fact is there is excess pressure in the valve cover that the factory breather tube can’t handle and the excess pressure exits via the UPR valve at WOT (as evidenced by the oil mist).

I’m not arguing benefits. I’m saying if UPR states that the product is designed to vent excess pressure, it does indeed do that. It functions as intended.

 

[yamahaSHO]

Ultimately, pressure needs to be logged through various loads. There is almost always going to be some pulsation in the crankcase. That said, if there is any exceptional pressure, this filter setup is not how I would 'solve' it.

 

[Muffin1]

So forgetting the HP claims and whatever else, would this be just good for eliminating the oil mist from spraying on the valves creating a carbon buildup issue.
And yes I know about catch cans but boy this would save a lot of scraped and bloody hands when doing a CC. Wishful thinking?

 

[Cmar]

Why are we even still talking about this? Yes it doesn't have CARB certification so they won't sell to California. But, it is against federal law to modify or disable emissions equipment. Any state that does testing will not pass this.

Are we so hungry for any imagined bit of HP? I'm pretty sure any gains from this are so small as to be within the limits of testing variability. The same could probably be said for the manifold and TB spacers from Boomba. But at least those are legal.

Maybe we should go back to the old road draft tubes, so we can have those nice oily streaks down the middle of the lanes. Yes I'm old enough to remember them.

I used to ride a motorcycle quite a lot back in the 1970's and I hated those oil slicks.

 

[importfighter01]

So forgetting the HP claims and whatever else, would this be just good for eliminating the oil mist from spraying on the valves creating a carbon buildup issue.
And yes I know about catch cans but boy this would save a lot of scraped and bloody hands when doing a CC. Wishful thinking?

Unfortunately this would not replace the function of a catch can on either the PCV line or the valve cover breather tube. UPR valve serves a different function. But it was a good clarifying question!

 

[TORQUERULES]

I have used these on my Mazdaspeeds and various Ford's. I get mine from CFM. I believe they were one of the first if not the first. BTW, no oil splatter, but an Outerwears just in case

Let the hate flow through you.... Lol.

 

[Dereku]

I have used these on my Mazdaspeeds and various Ford's. I get mine from CFM. I believe they were one of the first if not the first. BTW, no oil splatter, but an Outerwears just in case

Let the hate flow through you.... Lol.

Your engine looks sideways?!? Not sure why but the engine cover from this angle is misleading. Lol

 

[TORQUERULES]

Your engine looks sideways?!? Not sure why but the engine cover from this angle is misleading. Lol

Yea, the Ranger engine cover is shitty, but it is cheap to buy and dampens the sound of the HPFP, injectors, and valvetrain.

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