So I threw on a set of Edelbrock valve covers from Summit. On the drivers side front cover I have a standard breather cap with the holes on the bottom side. On the passenger side rear cover I have a pcv type breather with the hose going to the carb. The valve covers have factory baffles. On the driver side with the standard breather I have no oil drips. On the passenger side pcv breather, I have oil dripping out of the breather cap from inside. It is not leaking from the gasket in the actual valve cover, but oil is somehow getting up inside the pcv and then drips out slowly onto the manifold. If you look into the bottom of the pcv breather, it isn't just an open hole. It has a portion punched through and the hole is pushed up to make a baffle there also.
So how am I getting oil inside my pcv breather with baffled valve covers AND baffled breather? Everytime I shut the car off it starts drippin out the seams of the breather and smokes everywhere.
Posted By: HelleOnWheels
Re: Pcv dripping oil - 11/08/13 03:49 AM
Let me clarify.....the part that is leaking is not a true pcv valve. It is an edelbrock breather that has the post for carb vacuum line hose. I guess I could switch over to an actual pcv and see if it leaks but I just don't know why this one wont work
Posted By: RapidRobert
Re: Pcv dripping oil - 11/08/13 03:53 AM
It might be a faulty (or wrong one) PCV that's flowing too much air & that's pulling the oil up there. EDIT I missed your 2nd post, not sure what piece you have
Posted By: HelleOnWheels
Re: Pcv dripping oil - 11/08/13 04:17 AM
Posted By: HairOtheDog
Re: Pcv dripping oil - 11/08/13 04:53 AM
Typically,
Inside those types of breathers there's either a foam or other type of material, if it gets saturated with oil, it can begin to drip.
I'd recommend going to a standard PCV valve, may not be as attractive but they work.
Posted By: 80fbody
Re: Pcv dripping oil - 11/08/13 01:30 PM
You could try adding the breather grommet that has just a slit in the bottom. You'll need a new or clean breather to try it. You can flush yours thru a parts washer. Then a little brake clean & allow to dry. Sounds like you have alot of top end oiling & really good vacuum.
Posted By: jlatessa
Re: Pcv dripping oil - 11/08/13 02:25 PM
Rapidrobert is correct, that breather is not meant to be used like you have it, get a PCV valve routed to your intake.
Joe
Posted By: 80fbody
Re: Pcv dripping oil - 11/08/13 03:17 PM
If there's that much oil pulling out of the covers it will continue with a pcv correct? Just will dump into intake. Should he be concerned with it flowing back into the intake & fouling plugs, etc? Just thinking out loud here.
Maybe those baffles just don't work well.
Posted By: RapidRobert
Re: Pcv dripping oil - 11/08/13 04:42 PM
With the PCV being a small orifice it flows signficantly less than what is moving now & if that pass side breather nipple is plumbed to the carb/intake vacuum which it sounds like it is I'm surprised that it runs halfway decent at all as that is pretty much an open vacuum leak. You need a PCV on one side and a breather (either open or closed) on the other side then a fill cap to add oil. If that pass nipple is connected to the air cleaner (which it needs to be if you want a closed system) & there ain't no PCV on the other side then blowby under accelleration could be pushing oil up in to that pass breather but with that amount of oil dripping on the pass side & none on the dr side it sure sounds like that ain't the case & that just the pass nipple is improperly plumbed to manifold vacuum. EDIT I missed your last post. If you have a PCV plumbed to the carb base on one side and an open or closed breather on the other side you are all set. If there is no nipple on the air cleaner to connect the breather to the air cleaner for a closed system then yes the breather nipple can be left open (like the open breathers were in effect (no nipple) on pre '68 Mopars)
Posted By: HelleOnWheels
Re: Pcv dripping oil - 11/08/13 04:52 PM
The current breather with nipple on the passenger side is routed to the vacuum port on the carb. Originally, it had a pcv valve on that port but with the new valve covers the original pcv doesn't fit so I thought I could just use this breather type. I will change it out to a standard pcv valve on the passenger side.
So basically- put a standard pcv on the passenger port with a vacuum line to the carb port AND keep a standard breather with no nipple on the driver side? I don't have a port on my unsilenced original air cleaner.
Posted By: HelleOnWheels
Re: Pcv dripping oil - 11/08/13 04:59 PM
Headed to the parts store now......will be fixed tonight and then the fun comes....TEST DRIVE
Posted By: HairOtheDog
Re: Pcv dripping oil - 11/08/13 05:09 PM
The PCV valve is designed to allow vapors (pressure/vacuum) to be removed from the crankcase, it then passes to the air cleaner where its passed thru another filter and some is drawn back into the carb for another pass thru the cylinders.
The way you have that breather routed and hooked up to the carb vaccum, its basically acting like a straw in a soda can sucking the oil out, routing it to the air cleaner will reduce a substantial amount of vaccum and oil being drawn up/out, the PCV valve has a "stopper" in it coupled with the smaller orifice and less vaccum will reduce/eliminate that oil drip.
Now,
Depending on where you live (emissions), you could simply route that breather hose to the air cleaner and that would probably stop the oil drip as well, or just run an open breather with no nipple or hose and again, chances are good your oil drip will stop as well.