Sometime in the past, greenbird56 had a post about using a restriction in the PCV hose to control the airflow. I don’t have much luck using the search function but you might give that a try. IIRC, it went between the PCV valve and the carb.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

The PCV Valve has a Spring inside as well as a "Stepped"  restrictor which controls Air Flow. The Spring works against Engine Vacuum to keep the Valve in a Position to allow only a certain amount of Air to pass to Carburetor. If too much Air passes through at Idle you will think You have a Vacuum Leak. Rough Idle. Too much Air is causing a Lean Fuel Mixture at Idle. All PCV 's are calibrated for a Specific Application so the Trick is to find One that works Like I mentioned the last One I used was for a 78 Ford 4 Cylinder. The 302 One allowed too much Air at Idle.

  

Mark: Thanks.. Not sure what you mean by too much flow at idle, in what way?.  Further, I did some searching on PC valves & as far as I can determine, the #2072 may be from  Delco & it was indicated that it was used on smaller engines,"max size" 3.8 L V-6 or 232 inches. If that's correct (?) the one I have is way off ??. Will a unit for bigger displacement, be less likely to suck up oil or make it worse?? I'm Confused?!  


Paul

I just added a PCV System to my re-installed Engine. I used a Valve I think for a 302 Ford. I can tell already its too much Flow at Idle. The last Time I did this was 10 Years ago and ended up using One for a 78 Fairmont 4 Cylinder. Its usually a Case of experimentation. I used one of those Baffled Inserts because I am using Original Valley Pan and these Inserts are supposed to Work with a PCV. I did have to add a Grommet correct Size for the PCV Valve. Cut it down and Glued to the Baffle to hold the PCV in Place.

  

Charlie; thanks.. Does anyone know if a baffled valve will will fit over top of the original oil deflector?. Or will say an early (?) Ford 289 valve work?  Some later PC Valves have a double oulet for a closed gas vapor system connection, which isn't what I need.  Any info appreciated..    


Paul

PCV valves are application specific.  Since there is no valve specific to this application, the best chance at getting one that will work is to choose one for a similarly sized and performing engine.

If the valley cover has the baffle, then there could be something else going on.  If it doesn't or it is compromised somehow, you can try a baffled grommet to see if that helps.


Lawrenceville, GA

Have recently converted my 312 engine to a Ford Autolite 4100-1.08 carb & a PCV setup. Used a later style rear vent valley cover for the valve location. It's not a fully closed system & the air intake is thru the oil filler cap. (clean & in good shape)  We've got the carb sorted so the idle is good. At idle the PCV seems to be working fine, virtually O crankcase smoke at the fill pipe. However, after driving it briefly, it's now blowing oil smoke when accelerated. I pulled the valve out & looked into the original oil deflector underneath & found noticeable oil residue there  So, first question is, am I using an incorrect PCV valve ?  The one I have is new but I had it on hand & don't recall what it was for originally. The # on it is 2072, USA made. I read somewhere that the valves need to be sized properly for the engine ?  Is that correct?  Thanks.   


Paul