I've been putting this job off for awhile now but finally got it done today.
Like most people I did the breather cap thing to allow any excess blow-by to just vent to atmosphere. This causes two problems...the most known of which is unmetered air entering the engine which leads to such things as idle issues and off/light throttle lean pops through the exhaust. The other problem is smog issues. Here where I live, having in improper PCV system (ex.using a breather cap) can land you a $300 fine so I was never comfortable using it. Taking a tip from Pro-M's tech section I went about modifying the PCV system so it would function as Ford intended. Here is the tech from the Pro-M site:
"Throw away any breather to the crankcase that does not connect to the downstream side of the Pro-M meter. If you have a turbo or Super-charged system the crankcase vent must be enlarged (5/8 inches to ¾ inches) and again plumbed between the Pro-M and the inlet of the super-charger/turbo."
I decided to go 3/4" to allow ample volume to deal with any blow-by and then made myself a 3/4" elbow out of some steel tubing which I mig welded to the side of the fill tube on the valve cover. I then made a hole in my power pipe to install a grommet and 3/4" 90* elbow I picked up at the auto parts store and then connected the two with a section of hose. Also in my PCV system I run a Tbird Turbo Coupe PCV valve that has a rubber lined orfice that seals shut whenever boost is present. I haven't tested the car yet but I don't forsee any problems other than the possibilty of oil collecting in the hose and entering the power-pipe. I plan to monitor the system closely and if that ends up being the case I'll fab up a catch can system. At least I won't have to worry about the smog cops anymore.
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