Building a Mustang GT: Why & When You NEED A Valve Cover Breather

[@tssci6774]

The more vacuum in the crankcase improves cylinder sealing, reduces blow-by. Race engine actually run a dry sump and vacuum pumps to keep high vacuum in the crankcase. The stock PCV system draws crankcase vapors through the cleanside during boost and open throttle by way of venturi affect of the velocity of the intake charge.. I have tested this breather. It does not function as described because of the low mass of the plastic nylon ball. . 10 seconds and piece of tissue will show that nylon ball is dancing around venting and allowing unmetered air into the engine even at idle. Remove the filter and see for yourself. Have the filter on top offers no resistance. This breather disrupts the normal build-up of vacuum in the crankcase by the PCV system, causing more gases, contaminents, and acids to build up. My little $80 OBDII tool showed a loss of of air reported by the MAF and a 8-10% increase in fuel trims, indicating unmetered air entering the system. This unmetered air is not healthy for your engine. The only way to get it to stop dancing around is to put my hand over it and sealing off so the PCV system can build enough vacuum to overcome the positive pulses. As soon as you disturb the vacuum or reduce it just by touching the throttle it starts venting again. All engines have pulses of positive and negative pressure due to the rotating crank and pistons. Hector at CFM admitted they have not done any testing and could not produce any data. GM has $15 valve regulated oil fill cap designed for this and does not vent at the slightest pressure. This cap will disturb the normal flow in the PCV system. CFM has the technology to put a manometer on the crankcase to fully test it but wont. I did with a $35 professional meter.

[@trunkslorenzana]

So what would you recommend ? Just leave the stock oil cap?

[@tssci6774]

@@trunkslorenzana GM came out with valve regulated oil fill cap 10 years ago, there is a TSB on it, and it has been used on many GM engines to prevent the over pressure condition, especially in winter months. AC Delco FC-219, only $15 and it works well. No reports of it freezing, venting prematurely, and backed up by OEM. Jasper Engines includes one on each rebuilt engine it sells.

[@randy2.0kitt]

Think I’m gonna return this item cuz I feel like my car is slower now less HP could this be true or all in my head.

[@tssci6774]

@@randy2.0kitt put the stock cap back on.

[@sylvesterstallone8637]

I absolutely agree 100% that’s the only reason why that thing would cause the idle to be all messed up because it’s getting stuck open at idle. If you get one then get one from UPR products theirs won’t do that and they have them for all makes and models and you only really need one if you’re racing your car. Any stock vehicle even with an aftermarket blower does not need one of those things. And oil catch can is good enough. If there’s anything that I know it is coyote engines, I have not built a GEN three yet but I have built all kinds of Gen twos and Gen one coyote Engines

[@trnql_noir]

This is one of the best explanations of a PCV system. Thank you for creating and sharing this content

[@dheerajkatoch7399]

Until now most of us thought crankcase recirculation was just a way car manufacturers went by to abide by emission norms,now we understand the role of 2 vents crankcase and pcv and how they balance/regulate the pressure of an internal combustion engine,and the role a one way chk valve on the engine oil cap performs in releasing excessive pressure(which until now was thought to be vented via a crankcase breather) Thx so much Cameron for all the hardwork & research u went through for making us understand this and use this valuable information in our builds :)

[@shoominati23]

PCV gives better Ring Seal, less wear on internals, less on no leaks thru seals on gaskets on engine blocks and obviously better emissions. But not alot of people know that you really need to have a breather drawing air into the engine while the opposite side valve cover relieves it into the intake manifold. Look at your common or garden '68 chevy smallblock - you will have the PCV hooked to the pipe in the base of the carby, and then on the passenger side you will have the breather connection which should go to a little plastic scoop inside the air cleaner with a foam membrane. It's a much more complicated but necessary system than one thinks.

[@eden4949]

9:33 i think saying that ICMs have been "designed" to let blow by gasses pass into the crankcase (or them *having* to go somewhere for that matter) is slightly incorrect. In a perfect world piston rings would perfectly seal the combustio chamber from the crankcase. Blow by gases are only a thing because they can't perfectly seal due to the extreme pressures of boosted motors.

[@MustangGuru]

On a supercharged engine like the Coyote placing said breather you would have plug off the vacuum going to the supercharger inlet from the PCV. As well the clean side hose to the non metered hose on the intake tube and place a breather (non check valve) on the clean side, the pressure from the blow by at higher RPM will force dirty air back into the intake system thru the throttle body. I would for supercharged system block of original PCV system run a vented catch can on bank 1. And a vented filter on clean side. Only clean air gets into the intake system. The original clean side will block off as well. All crank case pressure will be routed to the vented catch can. And no check ball.

[@ScottBranleyRacing]

Thanks man, this relives a lot of stress lol . Just got my boosted V8 build done and had lots of valve cover pressure pushing oil out the gasket, was worried i had big issue but car has a non vented catch can so air had nowhere to go

[@RD-ve3wi]

If you doubt the SVT engineers fix, simply use a unidirectional cap w/a latex cover. A trimmed latex glove works great. Late model Mustang works on my 04 Lightning

[@Dopamine1217]

What is that?

[@cfmperf]

Thanks Cameron for such a great job and putting in the long hours to explain this complicated subject to those who are interested in learning and understanding more about it! 🔥🍻

[@tssci6774]

Just bought one of these breathers. 10 seconds and piece of tissue will show that nylon ball is dancing around venting and allowing unmetered air into the engine even at idle. Remove the filter and see for yourself. Have the filter on top offers no resistance. This breather disrupts the normal build-up of vacuum in the crankcase by the PCV system, causing more gases, contaminents, and acids to build up. My little $80 OBDII tool showed a loss of of air reported by the MAF and a 8-10% increase in fuel trims, indicating unmetered air entering the system. This unmetered and unfiltered air is not health for your engine. The only way to get it to stop dancing around is to put my hand over it and sealing off so the PCV system can build enough vacuum to overcome the positive pulses. As soon as you disturb the vacuum or reduce it just by touching the throttle it starts venting again. All engines have pulses of positive and negative pressure due to the rotating crank and pistons. Hector at CFM admitted they have not done any testing and could not produce any data. GM has $15 valve regulated oil fill cap designed for this and does not vent at the slightest pressure. This cap will disturb the normal flow in the PCV system. CFM has the technology to put a manometer on the crankcase to fully test it but wont. I did with a $35 professional meter.

[@TheManic.5-OH]

So what's your response to this comment? I ordered one of these the other day and I'm not sure I even want to try it. I've even suggested it to some other people as well. So I'll be a little salty if you guys made me look dumber than I already do on my own

[@VikingAF1111]

Great job. Awesome! Get it 100%. Ordered this and I catch 10 for my Challenger Hellcat after watching your video. Great Content appreciate this. Keep up the good work.

[@815garage]

What about on a Naturally aspirated 4 cylinder? Specifically the ND Mazda MX5. I’ve seen people put it on them when they turbo them

[@sheluvsmax6221]

This video is amazing man, I have a very high compression 5.7. And have been chasing the cause of a constant oil leak after fixing all gaskets. Hoping this allows some better breatbing😂

[@FroztiProductions]

But assuming your valve stem seals are in good shape, any pressure coming from the crank-case to the valve cover is probably coming through the oil channels. If this is true, regardless if you're venting it from the top or not, it's affecting the flow of oil up to the head, and draining down from the head. There's supposed to be oil flowing through there, not blow-by vapor. So it would be ideal to find a way to add more venting straight to the crank case so that it doesn't have to pass up to the head. I don't want to drill holes in a good block, that sounds like asking for trouble. Maybe tape the oil pan, then have a tube on the inside that runs above the oil level?

[@jpadilla0515]

Had the upr version of this, leaked and swapped to pvc breathers instead. Great video and explanation thought

[@RD-ve3wi]

Ford SVT addressed this condition by developing a PCV that never fully closes on Gen 2 Lightnings, assume any stock SVT models have same. Eliminates most if not all blow by. Replacing the PCV should be the panacea for excess contamination accumulation. So in theory the unidirectional filler cap wouldn't be necessary. I've got a bi directional filler cap w/a trap that has 0 volume in 3,400 mi.

[@silenttruth110]

Get an oil catch can for the blow by on the PCv valve

[@bartbarnett2811]

Bro most excellent job. You explained everything so well. I watched the whole video and I didn't even need to. I'm a heavy duty diesel mechanic back in the day we used to let our blow by run out the valve cover and onto the ground. Now we have to use oil catch cans and blow-by filters. And with these big diesels when they start getting excessive blow by but they still run fine it creates problems with the turbo and liners and everything else and I was just trying to get a better understanding of how we could fix this problem to get another hundred thousand miles out of the truck. And thanks to you I now have a solution. Do the regulations I still won't be able to vent to atmosphere. But I can come up with a system that's cheap and effective to get that extra 100 or 200,000 miles out of the truck. Thanks.

[@pines8411]

Just learned a new thing today. Thanks ✌🏼

[@MrSteveb2429]

Nice job on your video and also you can put a couple drops of oil on the ball before installing.

[@paulg444]

It only took 3 minutes in in order to get the short summary .. that was fantastic.

[@markvon9727]

Only question: does installing catch can / breather stop 2.5 KIA from consuming oil?

[@speeddemon_1369]

I got a brand new engine replacement from jasper in my 2014 chevy equinox which is stupid expensive I'm looking into putting on one of those with a oil catch can because the motor has a PCV valve design flaw it causes some serious oil consumption problems

[@speedfreaksupra]

Just order mine buddy thank you for the video

[@mikekitsune123]

Hey Cameron. Will I benefit from a valve cover breather is I am not going to boost my 2017 mustang gt. Thank you in advance. Excellent video btw. I am now a subscriber. Cheers

[@samuellett4994]

pcv system not good on erquinox added breathert to avoid rear main seal blow out

[@speeddemon_1369]

I'm here for the same reason I got a 2014 equinox with a brand new engine replacement from jasper which is stupid expensive...I'm looking to put one of these on along with a oil catch can

[@KINGKJ2REAL]

I run two filters. On my gen 2 coyote is this fine ? I have one on each PCV valve. Been on the car for awhile now and it runs fine

[@jocamick]

Wondering the same. Seems like it should be fine on both valve covers.

[@nate5.096]

How’s it been?

[@mohammedanfaz3841]

Thanks for breaking it down! Very effective explanation

[@kerryjohns7784]

Man I've been trying to find one of those for my mazdaspeed 3 and nowhere will send one to New Zealand for me and here you are getting them for heaps of cars and I'm like where how haha

[@jasonnellis3566]

Love this breather. What do I use to clean it. It's dirty

[@justymarq2933]

wow, what a perfectly constructed video man

[@jgreenjeans]

Subscribed. I learned a lot. . . I think🤔. . . I'm wrapping my head around it. Thanks for admitting that it took you a while to understand it. I think people THINK they know something, but when they try to explain it to someone else, they realize they don't really know (unless they're self aggrandizing) I just did an intake mod that deleted the breather tube just after the MAF and I replaced it with a little filter on the valve cover and couldn't understand why I'm lean only at idle. Now I get it. I'm pulling in un-metered air through that little filter. 😃 Knowing my problem is half the battle

[@sumdooky]

I have oil leaking from blow by. Would this relieve some blowby in this situation or should something else be done?

[@hajileserpud9539]

Add a catch can ASAP !!! That will help immediately then look into getting a vented breather

[@udonwadon]

Will you install oil catch can on your car?

[@tssci6774]

Wrong it does not seal perfectly. You would have to develop 5-10inHg to start causing problems, you want a continuous vacuum of .1- .5 inHg. At ambient pressure in the crankcase you valve is closed, when under vacuum it is open if in fact you are using a true PCV valve not a PCV Orifice. The testing I have done has shown that crankcase vacuum is greatest at WOT, because of the fresh air side, actually it is called a Make Up Air Circuit. Have you heard of the Venturi affect, which all carburrators are design upon. Cameron have you done any crankcase pressure and fuel trim testing before and after you did this. That oil in the breather will drain back down into the crankcase, and will be adding oil every couple days. Yes, you have a pressurized intake but the stock PCV system will draw out the small amount of pressure in the crankcase, even when supercharged, through the intake manifold or when under pressure through the fresh air side ahead of you throttle body. It take 10-15psi in your crankcase to start causing problems and oil leaks so stop scaring people, yet that little ball inside will vent at fraction of .1psi. If you have that amount of pressure in the crankcase, you have serious problems with the piston rings. In fact HECTOR said it will vent at ANY pressure. Guess what, you have a constant fluctuation of pressure and vacuum in the crankcase. Any first year auto technician will tell you that, the key is you want a predominent negative pressure for best performance. Google "crankcase pressure wave form" and you will see. I made the same mistake when I young and dumb, until an old mechanic slapped me up side head and told me to learn and understand and test what I am doing, because these companies will lead you down the wrong path for a quick buck, and they sure did. Worse now you are spreading the same mistakes and misinformation to others. Do some testing of your own rather than talk theory. A Digital manometer only costs $35 a cap with a port on it and some tubing and you can do all the testing you want. Less than the cost of that cap.

[@randy2.0kitt]

So do I loose power with this oil cap I feel like I did

[@nelon5234]

Thank goodness someone else knows how a modern engine works. US brands are just now catching up to eloquent systems used on turbocharged Euro cars. Don't believe me, look at the LT5. M-E Wagner makes the best PCV product, but a catch can should be added.

[@nelon5234]

This product should also have a check valve, and should only be used on high boost, high HP engines that have drastically changed the engine from OEM spec. And in reality, choose a better ring pack for that high boost, high HP engine.

[@tssci6774]

@@nelon5234 I blocked off my orifice and installed Provent 150 and MEwagner dual stage valve. My intake valves are staying clear. Provent is filtering the GDI Soot, fuel vapor and no oil is getting past it.

[@nelon5234]

@@tssci6774 Hell ya, ProVents are great, even with how much the filters cost. We bought one at work for benchmarking the can we're designing.

[@jonathanpineda5477]

I love learning ! Especially on my mustang 😊

[@osiris.y]

Thanks for the lesson now I know what that mini filter is used for and mine is leaking oil I want to get a new one but I’m not sure if their universal or I have to get an specific one

[@d3klin]

So the Valve Cover Breather is better instead PCV delete method or use Oil Catch Can? Why? Isn't it better for pressure equalization and not to get oil into intake manifold use the PCV delete?

[@ndasigerry]

Have a question, is the fresh air inlet into the crankcase a one way valve(in) or is a open pathway? (air can go in or out)

[@emerica1199]

Will a catch can with one of those breather filters on top of it work as well?

[@jeremyswann2228]

Air intake one driverside, passenger side is caped by oil cap/filler. Is a catch 🛢 better in the place of the capped spot by oil fill? 2013 mustang gt procharger. Just ordered oil cap breather

[@little_xsaud6636]

I have a v6 charger 2010 but I’m not sure we’re to put it

[@HectorRodriguez-fe8xz]

I have a cherokee srt 6.4 not turbo no supercharger, only have cold air intake and repro you think i may need one?

[@Nuxx.O]

Great Explaniation Sir, Thank you.

[@Tez4816]

If you are running PCV Breathers do you still need this?

[@cfmperf]

Shouldn't disable PCV on a street car. The money you save on a catch can you'll spend on replacing prematurely contaminated oil.

[@cfmperf]

To answer your question, the more ventilation you have the better it is if you're boosted.

[@trunkslorenzana]

@@cfmperf should I run this on a FBO 2015 Mustang 5.0? Im not boosted but I do got a cobra jet and its on e85, im push 473rwhp.

[@cfmperf]

@@trunkslorenzana It is definitely not as necessary as it is with a boosted application but it won't hurt to run one.

[@trunkslorenzana]

@@cfmperf which one do you recommend?

[@JV-eb6hy]

I put a breather on scatpack by the MAF

[@Vickland5]

I understand that two are not required, but any problem with two being installed? I currently have two K&Ns one on each valve cover, but not as cool seeming as these with a valve...at least from what I can tell is they are filters that might allow air both directions(???)

[@_sj5.0_13]

Hey bro I don’t see one for 2020 gen3 10speed mustangs on the website?

[@yellowbomb1075]

I put a filter on my pcv port on my 1uz and it didn't run good I could feel the vacuum from the intake I turned the car off after a minute do u think it's fine you think I hurt my engine?

[@josebonilla5607]

More easy if you have turbo just conect de pcv valve in the intake but 1 inch after pcv breather

[@jaemedrano7318]

Hi when do you need to know the filter has to be changed plz let me know thanks

[@Itsjustac6]

What if my c6 corvette ls2 it’s FBO but haves no turbo or super charge would you still recommend it? It have a oil catch can already

[@Lg1969]

Hey Cam do you know if it fits perfectly on a 2016 Mustang Ecoboost which has cover and oil cap is kinda in so wondering is it extended long enough to close a seal??? Also you don't need like a clamps to hold th breather cap,, I see the UPR one needs a clamps ??? Great video so informative Thank You ....

[@jorgecortez7352]

What about if the car comes with a turbo (new nissan altima vc 2.0 turbo) and how will affect the the boost will it have a lag/delay ? And can u still a blow off valve 50/50? To get the stu stu turbo sound ?

[@captainkai9989]

great video; does it work for porsche cayenne? my car is releasing constant fume on idle from pcv out

[@AndyLSB]

awesome ! will help a ecoboost mustang ? (4cyl turbo) i've heard that they sometimes have problems with oil leaks on the turbo or somewhere around there, will this help with that ?

[@lUcario97676]

Andy Salinas yeah everything adds up I just bought one for my fiesta st 👍

[@MasterGunZ]

Good informative video and I learned alot. I appreciate the work that went into this video. I have a catch can and I've seen people run this on their coyotes but never understood until now. Now I know what to buy when I supercharge my car

[@carlodonnell146]

My dodge ram v8 has a breather on the passenger side of the engine between the air-box and the valve cover; is that doing the same thing that the oil-cap breather would do, and would it be a benefit to have both?

[@ApexxPredator1]

Thanks for the info. Just ordered a CFM breather and catch can for my terminator. Also thanks for the 10% code

[@zachschmittauer7044]

So i have an LS1, have the driver side valve cover capped. Valley cover running to catch can(no more breather) to intake manifold. Currently have passenger valve cover and throttle body plugged too.. my question is should I still run the (vent hose) from that passenger valve cover to throttle body or plugged okay? Also just installed this oil cap breather and deleted breather from catch can to eliminate unregulated air in.

[@kazmsorany9693]

Nice video that i get my answer about the both side of intakes , but can we say this small filter isn't necessary because it just blow air so what is the problem if isn't on it ?

[@ThomasKornegay-e4p]

How do I get that valve cover breather

[@Oatis_07]

I’m Not sure if I should run a Oil Catch Can or a Breather Kit..Help! ? I have a 21 Mustang GT

[@geneLYH]

Interesting explanation. But, even when under boost pressure, the pcv would have flow. The blowby and the rising piston will still force air out of the pcv. Because if the boost pressure is so high that the flow stops, it would need to be equal to the blowby+rising piston pressure. If that were the case the piston would stop moving which doesn't happen... So the very fact that the pistons continue to rise and fall means that there is still pcv flow. Thus negating the function of the valve cover breather.

[@TankToChest]

The whole point of modifying the breathers is to lower intake temps and stop the engine dumping oil in the cylinders. Not sure what this guys trying to do here…

[@reignstir]

i know its been a year but can i put a catch can even if i dont have a turbo setup?

[@Random.Adventures.]

Hi there I have a 2009 honda civic. It has lots of air coming out of the engine oil cap on idle once I unscrew it. Would it be better for now to just keep the engine oil cap off? I also tried to test the pcv valve and it seems like it was working. What would be the next alternative. The hoses seem fine tho if there was a rip i would think that would be able to feel the air soming out of the hose right? Thanks in advanced

[@michaelbaskinmichael9862]

Where can I gee one exactly what I need thanks

[@rog2296]

Thank you

[@geriatricginger]

Extremely laymans explanatory, which I appreciate! Now help me explain why my catch can fills up every 100mi (300ml) on a VW 2.0 TSI with 14% leak-down and 205 compression test.. lol Or why my new OEM stock PCV will syphon 1/2 qt of oil in 70 miles, and shove it down the engine's throat.. I cannot figure it out for anything..

[@sijo24]

Good stuff. So I need catch can and oil breather valve.

[@SB-gt8bi]

I have a 300 srt8 6.1 with a procharger but i have a problem when i start the car and step on the gas oil starts coming out from my header breather valve and so when i get to the stop light smokes starts coming out from the hood any suggestions to get that fixed?

[@2ndAmendProtector]

How can outside air go INTO the breather and into the valve cover? Nothing gets sucked into the crankcase, only crank case pressure getting pushed out. So, why do you need a check valve?

[@nehemiaslabrador2288]

Would a catch can be needed after this?

[@adrianaguilar9627]

I have one on my mustang and is leaks oil by the filter do u know why

[@camwhitman5425]

Excellent video and explanation! Thank you.

[@diogopaterniani4073]

Is there any issues on doing that on a stock engine?

[@albertorodriguez-wm2oc]

Love the videos keep up the good work I just got my 2017 mustang GT very exciting to start working on it and learning from your videos BTW love the ST build keep up the awesome videos 👍

[@jdmlife4ever118]

So im okay putting this on stock motor?

[@thijsrooijakkers2153]

That is a very informative video. Does the CCV on the Focus make a difference to this videos? My catch can for the pcv side is in the mail, a breather is to be advised I just learned. Will my engine not be covered in oil or other residue when the breather is letting pressure escape ?

[@noelstrailridingxperience5279]

How do you clean it??? Please respond…

[@nickl8830]

Fanstatic information thanks for sharing

[@unstabled_cc]

Could you pre oil the check valve?

[@CoyoteDAworld]

Also thought about it

[@TankToChest]

No that’s illegal

[@crazybill42]

Smear a little oil on check ball 3 weeks no issues

[@SurgeonPain]

Can I still run this breather if I have a BOV??? Im running my BOV from the sound symposer delete plate on my intake manifold.

[@kevintlaseca3980]

Me too I have this problem too

[@shadowsshadows2630]

Do you have them for the eco boost 2019

[@cfmperf]

Please send model info to [e-mail]

[@chispagiddings]

Does it let oil smell to the engine bay?

[@sambo92]

What about if you have a breather on your catch can and capped off the manifold?

[@veganqwef1162]

Do they have one for 2015 chevrolet silverado 5.3

[@edgardcolon5763]

Great video. You explained it perfectly and simple 👌 thanks

[@markcase913]

I bought one from cfm and it’s been a week and I don’t have it...how long did it take for yours to come??

[@Asian_Connection]

it comes from China, it will take 6 weeks

[@markcase913]

@@Asian_Connection It’s been a year lmao I don’t remember how long it took but wasn’t 6 weeks

[@WhiteGravey]

so how did you get it? you live in california but i tried buying one and they wouldnt sell it to me.

[@mattb12341]

It is illegal in California

[@WhiteGravey]

@@mattb12341 i found someone to send it to me

[@Krisano1]

Pretty awesome video. Thanks. Very informative

[@ahmedwwh2854]

Thank you sooo much man you are the geat🌹

[@CoyoteDAworld]

Does this work for the ecoboost mustang?

[@anthony_sasquatch8056]

Can you put one on a turbo diesel?? Like a Jetta tdi?

[@eddingtonj9909]

Well explained

[@jeremyswann2228]

It is NOT seating properly, if I could upload pictures I would. Might want to find a different brand of this product, but we will see what the customer service is like.... guess I will get some channel locks to see if I can get it to twist all the way down to seal properly, in order to keep it from popping off.

[@tillitkillsmeoutdoors1851]

Will they ship this to California?

[@cheetoshotfries2289]

Can i put this on my honda v6🥸?

[@alundrasrt]

Isn't dangerous for engine bay? I'm afraid that oil droplet and exhaust heat can start a fire under the hood. Thanks.

[@cfmperf]

That won't happen unless the engine is hurt and has a lot of blowby.

[@sategllib2191]

No, I had a oil leak on a header for awhile and would just smoke as it burned off

[@alundrasrt]

@@sategllib2191 Thanks

[@permabulk1454]

I hope those were $79 TOGETHER and not for 1. They literally sell ZZP and k&n ones for under 30 bucks… or do they not have the check ball?

[@arxcinoss]

do they have one for a gen 1 speed3? or is it the same as the gen 2?

[@cfmperf]

You would need to upgrade to a Gen 2 valve cover.