Well...you can run the PCV valve with no breather. You can use it to pull a little bit of crankcase vacuum. That’s how I do it.
How much pan vacuum am I pulling?? At this point I have no clue. I also run a pan evac with the PCV valve so at a cruise both are pulling on the crankcase. At idle it’s mostly the PCV valve and at WOT it’s just the pan evacs.
I will be throughly flogging and data logging this on the dyno later this year, unless I have a stroke or a widow maker first. Both seem to be real possibilities.
