I have the small vent from the crank to the air intake, and a normal BT catch setup to a larger PCV. Just took the Metco breather off.. just wondering what everyone else is doing with their FI systems.
I've got a CFM Performance breather on my set up. I can really hear my engine breathing through this thing while running.
Some guys run a small K&N filter on the neck of the oil fill instead of this. Some guys run a small filter on their Catch Can. It's all about preference.
For N/A its detrimental. You want some crankcase vacuum. In a boosted set up you cannot rely upon intake manifold vacuum to supply the required vacuum to scavenge the increased crank case pressure. Thus the simple answer is vent to atmosphere. A real racing set up one would use a mechanical vacuum pump to set the proper crank case vacuum.
If you notice the line next to the oil fill goes to your intake piping. This accomplishes the same thing as those breather caps and then some.
^ good nutter info, thx. I'll run some logs without. Haven't noticed any symptoms of a vacuum leak. Though its probably not the reason, I'm having trouble getting my AFRs to register on my intune logs
On my rig(426 w/f1) im going with 2 non vented catch cans, removing the pcv valve and running both hoses to the inlet of the supercharger. Basically the way it says in the arrington ccv bible.
^ CCV bible. Weeks of finding useless info could have been saved if I had found this. Fantastic dissemination of CCV pertinent to our engines. Thx man.