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I bought an adjustable dual flow PCV valve with the inline adapter from Wagner; this valve design allows fine adjustments to be made that effect crankcase pressure and oil control. The valve is expensive at $158 but the build quality is very good and it's rebuildable with the included extra seals. The directions were followed to set up the valve using a vacuum gage (not included). Initial results are a slightly better cold idle at start up, long term should be reduced stress on the engine oil seals. https://mewagner.com
Here's the installed aluminum PCV valve plumbed to a catch can:
1) what's the point of an adjustable PCV? Isn't more flow more better?
2) Why is it inline with the catch can? That's the side that exhales. PCV would be on the side that inhales. Though it appears to be hooked to vacuum which is correct but then why the can after the valve? You don't exhale out of a PCV valve.
1. Refer to the bottom of page 5 in the directions, https://mewagner.com/wp-content/uplo...-Manual-R9.pdf I'm at #4 or 1 turn in the chart. 2. I asked them the same question; the valve works best close to the vacuum source, it will tolerate oil going through it and it can be plumbed before the catch can if desired. There's a small port on the left side of the valve as viewed in the picture where a plug is unscrewed and a barb is screwed in so a vacuum gage can be attached for calibration. If the valve was plumbed before the catch can the port would be on the right side close to the intake manifold and difficult to access. Using longer connecting hose could correct that but I wanted the shorter plumbing. I think Lowes had the black plastic 90 degree elbow at the bottom of the valve to make the short turn into the valley port.
2) Why is it inline with the catch can? That's the side that exhales. PCV would be on the side that inhales. Though it appears to be hooked to vacuum which is correct but then why the can after the valve? You don't exhale out of a PCV valve.
The flow across the valve will be the same regardless of its location (negating pressure loss effects from the catch can) as typical PCV valves are just pressure and/ore flow regulators.
Since it's a vacuum arrangement putting the valve upstream of the catch can means the valve would be subjected to all the stuff you want the catch can to "catch". Downstream of the catch can means the PCV valve will stay cleaner, and likely work better/more consistently for longer due to less gunk buildup.
The flow across the valve will be the same regardless of its location (negating pressure loss effects from the catch can) as typical PCV valves are just pressure and/ore flow regulators.
Since it's a vacuum arrangement putting the valve upstream of the catch can means the valve would be subjected to all the stuff you want the catch can to "catch". Downstream of the catch can means the PCV valve will stay cleaner, and likely work better/more consistently for longer due to less gunk buildup.
But the PCV only flows one way, so when the crank case tries to exhale here it can't.
But the PCV only flows one way, so when the crank case tries to exhale here it can't.
Do you mean this PCV valve only flows one way? My understanding of N/A PCV applications, you typically want PCV flow to only be in one direction, which is from crank case to intake (via vacuum from the intake).
Is there something wrong with OP's installation such that the flow direction is wrong?
I guess not looking again. Under part throttle, vacuum will draw the air in and WOT the crankcase pressure will just push it out, flowing in the same direction no matter what the operating conditions are. Now it makes sense why GM ditched the EGR valve when they went to the orifice in the vented valley covers. It also makes me think the adjustable PCV is that much more not needed. By default, the air will only ever flow in one direction. It's different than an old school setup plumbed to both valve covers.
A K&N 3/4" ID vent air filter/ breather was added to the oil fill cap for increased air flow, the valve cover tube hoses were left connected to filtered air.
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Installed an adjustable PCV valve
