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I did the metco chrome top.
 

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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...
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In my opinion, this is a s潭t潭u潭p潭i潭d潭 strange design (even if it works most of the time for most of the people). So CFM for me...
 

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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.
 

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Discussion Starter · #10 ·
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 s潭t潭u潭p潭i潭d潭 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.
 

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Charger SRT 392
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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鈥檓 noticing more of this with vendors, they won鈥檛 sell directly to California customers. Between CARB and sales tax, I understand why businesses refuse to get entangled with this oppressive state.
 

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2017 Challenger SRT Hellcat
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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.
 

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2017 Challenger SRT Hellcat
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There are several comments about the design of the various breathers but nobody has attempted to answer my questions above.
 

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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.


Linda :)
 

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2015 Charger SRT Hellcat
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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.
 

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2020 Challenger Hellraisin Scat Pack.
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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.
 
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