Silly Catch Can Question.

[LOL WUT]

I am putting on a UPR dual inlet breather tank catch can on a boosted gen 3 and I see lots of conflicting information on gutting or changing the factory pcv check valve.

I see UPR offers a “high flow pcv check valve” to replace the factory one which makes me question why you’d gut the factory one completely.

With being boosted I know that relieving excess pressure is important and I want to make sure that if I need to take additional actions other than installing the catch can that I do so. i.e. gutting the factory valve or upgrading to a high flow.

This is the unit I have.

https://www.uprproducts.com/11-21-mustang-gt-5-0-or-v6-billet-dual-inlet-breather-tank-plug-n-play/

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[WildHorse]

It's metered air for a reason. personally I think high flow/gutted PCV valves act like big ole vacuum leaks.

 

[GregO]

@LOL WUT

https://www.mustang6g.com/forums/th...-can-for-all-supercharged-5-0l-coyotes.16514/

 

[SheepDog]

I am putting on a UPR dual inlet breather tank catch can on a boosted gen 3 and I see lots of conflicting information on gutting or changing the factory pcv check valve.

I see UPR offers a “high flow pcv check valve” to replace the factory one which makes me question why you’d gut the factory one completely.

With being boosted I know that relieving excess pressure is important and I want to make sure that if I need to take additional actions other than installing the catch can that I do so. i.e. gutting the factory valve or upgrading to a high flow.

This is the unit I have.

https://www.uprproducts.com/11-21-mustang-gt-5-0-or-v6-billet-dual-inlet-breather-tank-plug-n-play/

You don’t need a check valve at all if the manifold port isn’t being used as originally intended on the factory PCV system. If both valve cover breathers run to the can, and the intake manifold and air intake ports are capped, the check valve is just a restriction. If you are using the PCV system then the check valve prevents pressurization of the crank case when in boost

 

[SheepDog]

It's metered air for a reason. personally I think high flow/gutted PCV valves act like big ole vacuum leaks.

It's only metered air if the PCV system is intact. If both valve cover breathers run to the catch can, and the air intake and manifold ports are capped, then 100% of the air coming through the intake goes to the combustion chambers. The air in the crankcase is only metered if it came from the drivers side breather tube after the MAF, which in OP's case, it does not.

 

[LOL WUT]

You don’t need a check valve at all if the manifold port isn’t being used as originally intended on the factory PCV system. If both valve cover breathers run to the can, and the intake manifold and air intake ports are capped, the check valve is just a restriction. If you are using the PCV system then the check valve prevents pressurization of the crank case when in boost

10/4 So nothing additional is needed. I will have the manifold capped as well as the intake. So Just hook up the catch can to the factory PCV fittings and call it a day.

 

[LOL WUT]

@LOL WUT

https://www.mustang6g.com/forums/th...-can-for-all-supercharged-5-0l-coyotes.16514/

Interesting and a little confusing as the one I purchased and linked in my first post says it’s great for supercharged vehicles running a centrifugal blower. Yet the one you linked says it’s specific for boosted applications lol.

 

[WildHorse]

This ain't a 2-stroke or a drag only engine. You need a crankcase breather & metered PCV valve.
Every 700+hp factory hellcat / redeye / Audi / Ferrari / even 2000hp Heffner Performance TT Lamborghini's today is equipped with just such a layout. Dunno why street driven coyote guys think otherwise.

But if yer a fan of oil leaks, ring flutter, etc., by all means run what ya want. Just my opinion.

 

[LOL WUT]

This ain't a 2-stroke or a drag only engine. You need a crankcase breather & metered PCV valve.
Every 700+hp factory hellcat / redeye / Audi / Ferrari / even 2000hp Heffner Performance TT Lamborghini's today is equipped with just such a layout. Dunno why street driven coyote guys think otherwise.

But if yer a fan of oil leaks, ring flutter, etc., by all means run what ya want. Just my opinion.

I mean in theory, the setup I purchased is just a fancy breather setup. Is it not? Hoses run from the factory PCV hook ups to a vented can.

 

[GregO]

Interesting and a little confusing as the one I purchased and linked in my first post says it’s great for supercharged vehicles running a centrifugal blower. Yet the one you linked says it’s specific for boosted applications lol.

 

[GregO]

@LOL WUT
This should help with understanding a Forced Induction Closed Crankcase System.
UPR’s Dual valve catch can is more closely aligned to this illustration.

 

[K4fxd]

The closed system is not needed.
It is 99% for emissions. Boosted or N/A there is no vacuum to the PCV valve under WOT.

 

[GregO]

The closed system is not needed.
It is 99% for emissions. Boosted or N/A there is no vacuum to the PCV valve under WOT.

My point more or less is understanding CCS vs. OCS.
99% emissions or not, capturing 70% of unburned blow-by hydrocarbons and reintroducing them into the combustion chamber with limited pullover isn’t a bad thing for an on road vehicle.
Now, if we’re talking all out competition on the ragged edge power wet sump engines we need to start a different discussion.

So we’re all clear, I’m not good with poisoning the air if it can be avoided, I’m not good with Catless modern street driven vehicle’s but that’s just me being me.

 

[K4fxd]

My point more or less is understanding CCS vs. OCS.
99% emissions or not, capturing 70% of unburned blow-by hydrocarbons and reintroducing them into the combustion chamber with limited pullover isn’t a bad thing for an on road vehicle.
Now, if we’re talking all out competition on the ragged edge power wet sump engines we need to start a different discussion.

So we’re all clear, I’m not good with poisoning the air if it can be avoided, I’m not good with Catless modern street driven vehicle’s but that’s just me being me.

I prefer to do my part keeping the air clean too. The small % of cars without cats or PCV contribute very little.

 

[WildHorse]

I’m not good with poisoning the air if it can be avoided

Petition for cleaner fuels then, like Porsche and their development of 100 octane carbon neutral gas. I'd pay over 2 bucks/liter for it, no problem. Or does your ethics have a price limit ?

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