you are correct t should have the pcv on one side and the breather on the other .without it the crankcase will be under too much vacuum and it will suck in the valve cover gaskets and valve seals and will really burn oil

 

PCV valve on one valve cover, breather with a nipple or a round "air filter"looking breather on the other valve cover. PCV is hooked up to a ported vacuum nipple on your carb. Vacuum from your throttle body will pull excessive crankcase pressure out and recycle it back into your intake to get burned off. Fresh air will come through a filter style breather or from the air cleaner itself if you use a breather valve with a nipple. Overall effect is lower crankcase pressure which can lead to oil leaks, reduced emissions, and less oil mist in your valve covers.

At least this is my 30k ft understanding of the PCV system.

 

egchewy is correct. Here is a screen shot of an explanation of the PCV function I found on the interweb.

HTH

Norm

 

I know as a forum you guys have mentioned this before. I was under the impression the breathers were doing this.

If it's this easy and won't hurt anything, I will implement this tomorrow.

Thank you

Jason

 

So does the breather on the other side take care of this or do I need to connect the other non pcv breather to the air cleaner?

 

just make sure you use a filtered breather and not just a regular one. a regular breather allows positive pressure to push out through the valve cover. with a PCV system, there will be a negative pressure sucking air in through the breather, so you want to make sure it's filtered, clean air getting sucked in. that's why you need to consider either a filtered breather or a breather w/ a nipple that you can connect to your air cleaner that will filter dirt/dust out of the air before it gets into your oil.

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I put something like this Universal Car Oil Catch Can Kit Reservoir Tank 300ml with Breather Aluminum Compact Dual Cylinder Polish Baffled Engine Air Oil Separator Tank Fit (Black), Reservoirs - Amazon Canada in the PCV line to reduce the oil mist going into the intake. Stops oil coking on the intake valves.

The filtered breather will work. The reasons they normally plumb it into the air cleaner are, it is an easily accessible cleaned fresh air source and, under certain conditions, the breather will act as a vent. If you are OK with occasionally getting oil mist on your valve cover then the breather is fine.

HTH

Norm

 

Awesome

 

Also it's a good idea to periodically pull that hose off the vac port to see if there is any oil getting sucked into the intake. The problems are; 1- that there is a lot of oil mist floating around in the VCs, 2- piston ring blowby at heavy throttle opening (normal in an HP engine) can actually pressurize the crankcase which creates a really high airflow inside the engine which can push a lot of that oil mist into the intake. So you burn the oil mist. One time I had rigged a pcv on my 351 and all seemed fine until I ran an autocross. About 1/2 way thru the run it started looking like I was fogging for mosquitos. I pulled the hose off the intake, capped the nipple and ran the hose into a big rag that I wire tied to the intake so it could absorb the oil. That got me through the event and then I started making a canister system to let the air out but catch the oil and get rid of the pcv. Modern engines have this problem a lot. I started when all the manufacturers went to the 11+ to 1 CR. There is a whole world now of air/oil separator canisters for sale.

 

I still have to make sure I know which is the pcv on the carburetors. I can not find a difinitive picture.

I assume that port is a the "pcv valve" that I do not need anything else.

I will hose clamp a 3/8 hose from the carb port. Probably the front carb. To a new breather with pcv port probably the DS.

Jason

 

I think your dual quad setup complicates the issue slightly. You could be creating a tuning issue by running to one carb. The air flowing through the PCV may require slightly different carb settings on that carb as compared to the carb without the PCV.

I am no expert on dual quad setups but, I am sure with the vast knowledge and experience that is on this and the other forum, someone can give you a definitive answer.

Norm

 

Yeah railroad has been helping too. He mentioned that. I was going to connect both to the system. Maybe balance it out. But I assume there will be retunning to be done. The final tune is not yet complete

 

Anybody got a recommendation for a PCV for my similar setup so I have something to start with

 

Never mind I got some help

 

I’d be curious on your solution. I’m running dual quad Holleys. One carb plumbed to PCV on one valve cover, open element on the other valve cover. Seems to run fine to me, but always open to improvements!

 

Well I'm learning. A couple guys are helping me.

I tried to order something from Jegs. The guy tried talking me out of it. Said it was not for me. That it was going to make venting worst.

I ordered a PCV.

 

Since people might be interested. I had a hard time finding what I needed locally for my purpose.

I originally bought my breathers from Billet Specialties. (which is actually only less that an hour away, stupid covid is making them not let me go pick it up)

They sell a breather with a replaceable PCV inside a matching breather.

So that with some hard plastic 90 quick connecter to get in the tight space behind the distributor and Front carb. A Tee and some 3/8 fuel line a couple hose clamps. I will be able to install it pretty easy.

See what happens. The guy at Jegs was insistant this was a horrible idea. Lol worth checking and I can always put it back.

Monday I am suppose to take the the build back to the mechanic to replace the intake gaskets.

I was going to try to offer him a couple options. That will be uneasy since he seems stuck on the gaskets he uses which claims is the Fel pro 1250 not sure steel core or not

I have in hand the steel core version and a Mr. Gasket

Mr. Gasket SB Ford Intake Gaskets - Medium Port

Mr. Gasket SB Ford Intake Gaskets - Medium Port

www.flowtechinduction.com

To offer.

I also will have today ARP intake manifold Studs hardware to replace the Edelbrock intake bolts that came with the intake kit.

Jason

 

Sounds good Jason. Make sure the mechanic does a thorough check for an interference issue before installing the new gaskets.

Norm

 

I will thank you

 

I disconnected the pcv valve and put K&N breathers in both valve covers and it works just fine.

 

You won't be evacuating ant crankcase gas with this method. Even the old "road draft tube" idea put a slight vacuum on the crankcase.
Yours does not. You'll likely see your oil getting dirty pretty quickly.

 

Not sure what your making a comment too.

I put a PCV system in. I figure it won't hurt. I can always take it out

I went from the rear 3/8 plug on the back of the manifold. Used a straight 3/8 Male to 3/8 barb and ran it to a breather that has a PCV in it.

 

how do you e-mail pictures to this site, can't do it for some reason.

 

You can attach pics with the paper clip symbol. Try hitting the gear symbol 1st. If the pic is too large it won't let you