Quick question - I have upsized my Valve cover breather outlets from stock to -10AN but using AN8 pushlok size hose. I am running dual Radium catch cans. The cold side breather comes to the inlet of the catch can and then the outlet has a Radium PCV installed on the catch can outlet to IM side. I am noticing that I am filling up the catch can at long idling sessions when I run through multiple flush cycles or tuning my cold start idle - I never had that much oil fill up with OEM breathers and 3/8 hose prior to this change. Given larger size breathers, do I need to consider opening up the baffles and stuffing steel wool scrubbers ? I did make the oem hole that crosses over in the baffle larger by drilling it out (based on advice here). The car has a built motor non turbo. Have not been on track yet with new setup but getting concerned about the fill up of oil vapor..I am running e85 for full disclosure and Amsoil synthetic 15/50.

Seeking your guidance.. Thank you all.

 

I used copper wool in mine. Steel isn’t a good idea.

Not sure of your catch can plumbing but I never had an issue with too much in the can.

 

Is there a possibility that the PCV is installed in the wrong direction? The PCV should be closed at idle.

 

It has been mentioned in the catch can megathread by people who have tried it that the Radium PCV valve flows a different volume to the stock miata and doesn’t work properly for our cars, sucking too much fluid through.

On scrubbers in the valve cover, I noticed zero difference in the amount of liquid oil being sucked through the PCV valve side before and after adding scrubbers.

 

I was not aware of the Radium PCV issue. I do see this as one of the variables that I did not have before. Now I am wondering if I get rid of Radium PCV, what can I use in it's place that can thread into the -10AN ORB.

 

PCV installed on the catch and connected to Intake manifold hose. I checked with Radium and they show the same side outlet to IM.

 

The direction of the valve wouldn’t cause oil to pool up in the catch can. If anything, installing it backwards would blow all the oil out of the baffle covers back into the engine…..and out your rear main seal!