[Gato Blanco]

Hey guys hope all is well. I'm texting to see which one of the couple of valve cover breather for a Hellcat do u recommend? 🤔

 

[GreenMachine15]

I did the metco chrome top.

 

[akras]

CFM. Considered Metco, but CFM has a better check valve design (a ball).

 

[Linda's Hell Cat]

Metco Motorsports Valve Cover Breather (2015+ 6.2L Supercharged HEMI Hellcat Vehicles)

Metco Valve Cover Breather (2015 Hellcat Vehicles) - MBR0019

highhorseperformance.com

My husband @Top Cat bought the Metco Breather popped it on at the track back in 2015 and it is still there working flawlessly!

 

[Gato Blanco]

CFM. Considered Metco, but CFM has a better check valve design (a ball).

No problems with it ?

 

[akras]

No problems with it ?

CFM breather works perfectly well. I frankly don't understand why someone would design a disk-shaped check valve instead of a ball-shaped check valve for this application (unless there is some kind of patent issue). The ball will seal regardless of the temperature expansion/production tolerances, and is much less likely to get stuck (opened or closed).

CFM has ball check valve, Metco has a disk. Plus CFM has baffles to keep oil from hitting the check valve; I don't think Metco has it. I think these differences are worth the extra $10...

In my opinion, this is a s̶t̶u̶p̶i̶d̶ strange design (even if it works most of the time for most of the people). So CFM for me...

 

[GreenMachine15]

I never had any issue with the Metco breather or the check valve design.
It is a good product, I do not have any oil mist anywhere, so I am sure either is sufficient.

 

[baabootoo]

So these are vented to the atmosphere??????????

 

[SRTCVO]

So these are vented to the atmosphere??????????

Shhhhhhhh .....

 

[Gato Blanco]

CFM breather works perfectly well. I frankly don't understand why someone would design a disk-shaped check valve instead of a ball-shaped check valve for this application (unless there is some kind of patent issue). The ball will seal regardless of the temperature expansion/production tolerances, and is much less likely to get stuck (opened or closed).

CFM has ball check valve, Metco has a disk. Plus CFM has baffles to keep oil from hitting the check valve; I don't think Metco has it. I think these differences are worth the extra $10... View attachment 573095
In my opinion, this is a s̶t̶u̶p̶i̶d̶ strange design (even if it works most of the time for most of the people). So CFM for me...

Thank you for the info. I was leaning more towards CFM.

 

[baabootoo]

Well, the disc would certainly have more surface area to seal though.

 

[HemiMetal]

My CFM breather arrived last week at my cousin's place in AZ because CFM can't sell them to CA. Tomorrow I'm headed to Chandler, AZ for my one day track experience at the Radford Racing School. My cousin's place is 30 miles away.

 

[Taxinator]

My CFM breather arrived last week at my cousin's place in AZ because CFM can't sell them to CA. Tomorrow I'm headed to Chandler, AZ for my one day track experience at the Radford Racing School. My cousin's place is 30 miles away.

I’m noticing more of this with vendors, they won’t sell directly to California customers. Between CARB and sales tax, I understand why businesses refuse to get entangled with this oppressive state.

 

[akras]

Well, the disc would certainly have more surface area to seal though.

In the ideal world... A ball will seal better in the real one, that's why most of the valves (any valves) use sphere-like surfaces to close an opening.

 

[Linda's Hell Cat]

Crank Case Breathers Now Shipping

Check this, no tools required: Crank Case Breather, 2008 & Newer Challenger & Charger: Metco Motorsports

www.hellcat.org

@[email protected] is a forum vendor on here. You can also read information in their section.

Linda

 

[DEANGEL]

On my old Foxbody Mustang, valve cover breather was a bad idea due to the PCV system being a closed system. They didn't have any check valves in them back then.

For this discussion for the Hellcat, can I assume the check valve closes during normal driving to keep the PCV system closed by not allowing outside air to be sucked into the engine? Then it's allowed to open during wide open throttle when the PCV system isn't functioning due to no vacuum?

If so, that seems like a very good way to have a properly functioning PCV system during normal driving then having a way for excess crankcase pressure to escape to atmosphere during wide open throttle.

 

[DEANGEL]

There are several comments about the design of the various breathers but nobody has attempted to answer my questions above.

 

[Linda's Hell Cat]

There are several comments about the design of the various breathers but nobody has attempted to answer my questions above.

Sorry bering polite here can't compare an old Fox body to a modern Hemi.

Here is the thread when the Metco 1st came out.
I would take a look through it. Members were posting about using it and you may get the answer from the thread
My Metco breather was put on in 2015 and 0 problems.

Crank Case Breathers Now Shipping

Check this, no tools required: Crank Case Breather, 2008 & Newer Challenger & Charger: Metco Motorsports

www.hellcat.org

Linda

 

[baabootoo]

Well, they did have a check ball on some GM ones. Remember the little black plastic thing that rattled? It never vented to the atmosphere either. It was sucked in to get burned a second time, through the intake. IN high vacuum, it was closed, low as under power, open.

 

[Rockster]

There are several comments about the design of the various breathers but nobody has attempted to answer my questions above.

A factory PCV system ensures the engine crankcase runs under low pressure whenever possible. This lowers the boiling point of any water in the oil turns to vapor and flows from the crankcase out the PCV hose to the intake.

Keeping the water content down helps the oil do its job and reduces the likelihood of any sludge build up.

There is a valve that in the even of a back fire in the intake prevents the crankcase from being over pressured.

Installing a vent open to atmosphere just ensures any water in the oil and there will be water in the oil remains in the oil until the oil is changed. Not good.