You said ===>. Putting in vented cap only worsens the accumulation of corrosive acids inside the engine. <===
And I say,
I disagree. Lower crankcase pressure means less "corrosive acids" inside crankcase.
The crankcase can be described as a closed container.
Piston blowby pressure, past worn rings, or piston blowby under wide open throttle, both increase crankcase pressure.
Corrosive piston blow by gasses' and resulting crankcase pressure can only escape from crankcase through two "holes"
1) the 2 mm diameter dirty side PCV orifice, (which in the 2.4 liter equinox has a tendency to plug up with oil and crankcase gunk)
the cleanside PCV "sintered" vent and breather hose assembly.
The cfm oil cap, provides a third path of venting crankcase pressure,
and venting all those gasses out old crankcase is best for longer oil life and best for the inside of engine.
Sydnesb, you said ===> That is why the FC219 has a higher crack pressure. If it vented at the slightest pressure like the CFM, the PCV system would fail at removing the unwanted gases and acids at high engine loads and speeds where it occurs most often. <=====
And I say,
the intake manifold is under high vacuum (like when you are decelerating)
then crankcase is under vacuum, as vacuum is pulled through dirty side PCV orifice( assuming no piston blowby from really bad piston rings)
both cfm and fc219 cap are both sealed and do not let "unmetered" air into crankcase.
When engine is under wide open throttle, and you have piston blowby, (even with good piston rings),
Then the crankcase has positive pressure,
the cfm oil cap immediately relieves crankcase pressure.
(thus also reducing crankcase gunk flowing out cleanside PCV breather vent.)
Higher cracking pressure of the fc219 is not as good as the lower cracking pressure in the cfm oil cap.( you get more gunk flowing out cleanside PCV breather vent at higher cracking pressure. )
The following article says the opposite of your claim that "high crankcase pressure is good. "
The following article says lower crankcase pressure has benefits.
DSportmag dot com, in an article titled
Quick Tech: benefits of lowering crankcase pressure, part 1
"When pressure in the crankcase can be reduced, taken to zero, good things happen.
Reduced crankcase pressure improves the sealing of the rings in the cylinder.
Increased differential pressure on the piston rings results in improved ring seal.
" Having zero pressure, improves the ring seal during the intake stroke"
That ^^ is what the article says .... ^^
Sydnesb, you said
====> The CFM is only band-aid. The solution is to provide adequate vacuum at all engine loads.<====
And I say,
-Kindly, Please tell me Sydnesb, How do i implement an "adequate vacuum at all engine speeds"
Tell me how to implement it on my 4 cylinder equinox
what to buy?
what hoses have to be cut during install,
where to put the device in the engine compartment?
And how to supply power to the device?
And finally Sydnesb,
-So what if CFM oil cap is a band-aide? ? ?
The cfm oil cap "band aide" prevents crankshaft rear main seal failure
and as the article in dsportmag says
"good things happen"
to your engine when you keep your crankcase at lower pressure.