Breather to PCV

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70DusterBob

70DusterBob

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I got a new breather by Edelbrock that does not have a connector/tube that goes to the PCV Valve. I don't need the valve, there are plenty of them. I can't seem to find a "Mopar" accessory part that you bolt on to the breather, that you have to drill a hole in, to make the PCV vent into the breather. There are plenty of "other" brands of engines that they provide this accessory for, but not Mopar. Anyone know where to find one? Used will work. All the ones I have found have like a 3/4" tube vent that attaches to the breather, but my PCV vent tube on the PCV is only 5/8".
 
That tube does not go to the pcv valve. It goes to the breather vent so that the air cleaner can suck out the vapors. Kim
 
Okay, so the breather goes to the breather vent. I still can't find the part that connects the breather to the breather vent.
 
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Well they both provide ventilation for the crankcase. Sorry I am not perfect or use the right terms at times. I last was in auto mechanics classes in the 80's.
 
I'll click right over there and see. I know they make the vast majority of parts for Chevy, but maybe there is a Mopar one out there. What is the name of that elbow on the breather that goes to the tube that goes to the breather vent anyway?
 
It's all part of the crankcase vent system. The PCV is on one side and the crankcase vent on the other. So crankcase vent elbow? I would assume.
 
I can't find it right off. Should this work with rubber washer seals, steel washers? I don't know if they make a nut that goes on the 1/2 NPT though.
 
70DusterBob said:
This is what I have found before: Crankcase Ventilation Hose Connection Kit

I'll keep searching, maybe I'm getting close!

Here's one for Chevy all pretty like: Edelbrock 90 Deg. Polished Aluminum Waterneck for Chevy 4.3L V6 & Chevy V8
Click to expand...
Dude the Chevy part you linked too is a upper radiator hose connection on the intake manifold, it goes over the thermostat.
Wix makes a Mopar style breather that will connect to air cleaner. I have a new one if you need it. It mounts in a grommet in the valve cover.
 
512Stroker said:
This my help
Positive crankcase ventilation
Click to expand...

From the sounds of that article, I don't really need to have a breather, or can use one that just vents the crank case on the passenger side of the engine. Am I right? I thought the engine needed to vent the blow-by to prevent damaging seals and such??

Seems to me that the breather to breather vent is a constant one while the PCV is variable.

I get my car back tomorrow. It has 30 miles on the engine. It is a high performance 408. I don't want to damage it, but if the breather doesn't "NEED" to go into the air filter breather, please someone let me know! I have tried Edelbrock, Summit, Ebay, Year One, Classic Industries, and Jegs. No one has the right elbow for mopar SB.

Thanks
 
70DusterBob said:
From the sounds of that article, I don't really need to have a breather, or can use one that just vents the crank case on the passenger side of the engine. Am I right? I thought the engine needed to vent the blow-by to prevent damaging seals and such??

Seems to me that the breather to breather vent is a constant one while the PCV is variable.

I get my car back tomorrow. It has 30 miles on the engine. It is a high performance 408. I don't want to damage it, but if the breather doesn't "NEED" to go into the air filter breather, please someone let me know! I have tried Edelbrock, Summit, Ebay, Year One, Classic Industries, and Jegs. No one has the right elbow for mopar SB.

Thanks
Click to expand...
True you need to have a breather in one valve cover and a PCV in the opposite valve cover.
No the breather does not have to be directly connected to the air cleaner as long is it free flowing and unobstructed.
It does help to have it connected to the air cleaner as it can only draw filtered air into the crankcase to vent out thru the PCV.
 
512Stroker said:
True you need to have a breather in one valve cover and a PCV in the opposite valve cover.
No the breather does not have to be directly connected to the air cleaner as long is it free flowing and unobstructed.
It does help to have it connected to the air cleaner as it can only draw filtered air into the crankcase to vent out thru the PCV.
Click to expand...

I am certainly one who is not all there... lol. I had a few too many hard knocks to the head to be normal anymore. But I manage some how.

Anyway, so the breather sucks through the carb breather? Maybe not all the time like at idle, but like when you are around 5,000 rpm, I can see that it could suck through the air filter because of the lower vaccum or higher pressure above the carb and lower in the manifold. Is that how that sucker works? So while I technically don't have to have the valve cover breather sucking out of or being sucked out through the carb breather, it wouldn't hurt and could be actually better to have it that way?

In my fog I kind of remember finding that elbow somewhere on the internet and I ordered it but it hasn't gotten here yet. It was a Mopar 5/8" one. I have searched all the places I usually go looking for the order but can't find it and I didn't get an email receipt. I hate that.

Anyway, I guess it will be okay to drive it with the breather not attached to the breather, which sounds odd, but I can continue my search as time goes by. Maybe I can find one somewhere.

But just to be sure, it is okay to run it with an open valve cover breather not connected to the carb breather temporarily?

Thanks,
Bob​
 
70DusterBob said:
From the sounds of that article, I don't really need to have a breather, or can use one that just vents the crank case on the passenger side of the engine. Am I right? I thought the engine needed to vent the blow-by to prevent damaging seals and such??

Seems to me that the breather to breather vent is a constant one while the PCV is variable.

I get my car back tomorrow. It has 30 miles on the engine. It is a high performance 408. I don't want to damage it, but if the breather doesn't "NEED" to go into the air filter breather, please someone let me know! I have tried Edelbrock, Summit, Ebay, Year One, Classic Industries, and Jegs. No one has the right elbow for mopar SB.

Thanks
Click to expand...

Good grief. Do it like you want to. Leaving the breather disconnected from the air cleaner means you'll have a buildup of crankcase oil residue on the passenger side valve cover in short order. That's why you run a closed breather with a hose to the air cleaner like you've been told multiple times and refuse to understand. So have at it.
 
RustyRatRod said:
Good grief. Do it like you want to. Leaving the breather disconnected from the air cleaner means you'll have a buildup of crankcase oil residue on the passenger side valve cover in short order. That's why you run a closed breather with a hose to the air cleaner like you've been told multiple times and refuse to understand. So have at it.
Click to expand...

Well, like I have said multiple times, if I could find a dang breather elbow I would have at it. I don't "refuse" to understand. I DO understand. That is why I have been asking members where to find one and NOONE has come up with one. If your so smart you find one.
 
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70DusterBob said:
Well, like I have said multiple times, if I could find a dang breather elbow I would have at it. I don't "refuse" to understand. I DO understand. That is why I have been asking members where to find one and NOONE has come up with one. If your so smart you find one.
Click to expand...
I dont know what elbow you are in need of but if you cant buy one you need to make one.
Go to your local auto parts place and go thru there hose inventory until you find something that will work. Junk yards are great places to search for parts.
There is always more than one way to shave a Cat.
 
70DusterBob said:
I am certainly one who is not all there... lol. I had a few too many hard knocks to the head to be normal anymore. But I manage some how.

Anyway, so the breather sucks through the carb breather? Maybe not all the time like at idle, but like when you are around 5,000 rpm, I can see that it could suck through the air filter because of the lower vaccum or higher pressure above the carb and lower in the manifold. Is that how that sucker works? So while I technically don't have to have the valve cover breather sucking out of or being sucked out through the carb breather, it wouldn't hurt and could be actually better to have it that way?

In my fog I kind of remember finding that elbow somewhere on the internet and I ordered it but it hasn't gotten here yet. It was a Mopar 5/8" one. I have searched all the places I usually go looking for the order but can't find it and I didn't get an email receipt. I hate that.

Anyway, I guess it will be okay to drive it with the breather not attached to the breather, which sounds odd, but I can continue my search as time goes by. Maybe I can find one somewhere.

But just to be sure, it is okay to run it with an open valve cover breather not connected to the carb breather temporarily?

Thanks,
Bob​
Click to expand...

Yes !
I have been experimenting w/ these set ups for a while now , w/ a vacuum gauge from the valve cover to inside the car. I cant figure out for the life of me , why my engine runs like its got a vacuum leak when the air breather is hooked to a valve cover breather ,when I`m running the pvc ports on the back of my throttle body thru an oil catch can(experiment
no oil has shown up). The other side , I`ve tried the system like in the drawings RRR and 512 posted , and because st hemi`s came that way from the factory.
I currently have a screwin oil cap on one side , pcv to the throttle body on the other, and have the best crankcase vacuum that way , 5'' , up to about 4200, it should drop off at wide open throttle but I havent nailed it and tried to watch the gauge at the same time yet.
The crankcase vacuum is steady , and darn sure has helped stop my oil leaks , when I take the screw on cap off while idleing u can hear it suck in very loud and feel the pull on the cap as I remove it .
Just wondering what it will do when held at wot , like on the strip , that is where the breathe hooked up would work it seems . But cant get past the vacuum leak it has when hooked up that way .-------------------thots and comments welcome -------------
 
famous bob said:
Yes !
I have been experimenting w/ these set ups for a while now , w/ a vacuum gauge from the valve cover to inside the car. I cant figure out for the life of me , why my engine runs like its got a vacuum leak when the air breather is hooked to a valve cover breather ,when I`m running the pvc ports on the back of my throttle body thru an oil catch can(experiment
no oil has shown up). The other side , I`ve tried the system like in the drawings RRR and 512 posted , and because st hemi`s came that way from the factory.
I currently have a screwin oil cap on one side , pcv to the throttle body on the other, and have the best crankcase vacuum that way , 5'' , up to about 4200, it should drop off at wide open throttle but I havent nailed it and tried to watch the gauge at the same time yet.
The crankcase vacuum is steady , and darn sure has helped stop my oil leaks , when I take the screw on cap off while idleing u can hear it suck in very loud and feel the pull on the cap as I remove it .
Just wondering what it will do when held at wot , like on the strip , that is where the breathe hooked up would work it seems . But cant get past the vacuum leak it has when hooked up that way .-------------------thots and comments welcome -------------
Click to expand...
Wow 5 inches of crankcase vacuum?
Are those inches of water or inches of mercury?
From what point on the engine are you pulling that measurement from?
 
512Stroker said:
Wow 5 inches of crankcase vacuum?
Are those inches of water or inches of mercury?
From what point on the engine are you pulling that measurement from?
Click to expand...

5'' on a vacuum gauge , take ur pic . Pulling it out of a blank location , I drilled and tapped the black mopar performance cover BLANK spot , same side as the pcv set up, SCREWIN CAP ON THE OTHER COVER I mentioned. W/ my solid .600 lift street roller it only has roughly 8-15 '' intake vacuum depending on rpm .
I had a freind thats called (mr chevrolet) by some around here tell me to do the pcv / sealed cap deal on a hot 406 sbc engine I had once, to bring it into the 20th century ,
" food for thot! !!". -----------???
Probly going to take the oil catch can off and run it with this set up for a while , I think my rings have finally seated .
 
The breather does "not" have to be connected to the air cleaner. Install a push on, or twist on breather in the valve cover.
If you have baffles inside the valve covers, like the factory did, blow by shouldn't be an issue. Give it a wipe with a rag on occasion.

On the other valve cover you have a pcv valve. That will need to be connected to the appropriate port on the carb.

408...Can you post a pic of the said motor and valve covers ?

Picture 498.jpg
 
70DusterBob said:
Well, like I have said multiple times, if I could find a dang breather elbow I would have at it. I don't "refuse" to understand. I DO understand. That is why I have been asking members where to find one and NOONE has come up with one. If your so smart you find one.
Click to expand...

I don't need one. I have a breather with a 5/8 nipple on it. Finding those is as easy as findin a 20 dollar hooker in LA.
 
famous bob said:
5'' on a vacuum gauge , take ur pic . Pulling it out of a blank location , I drilled and tapped the black mopar performance cover BLANK spot , same side as the pcv set up, SCREWIN CAP ON THE OTHER COVER I mentioned. W/ my solid .600 lift street roller it only has roughly 8-15 '' intake vacuum depending on rpm .
I had a freind thats called (mr chevrolet) by some around here tell me to do the pcv / sealed cap deal on a hot 406 sbc engine I had once, to bring it into the 20th century ,
" food for thot! !!". -----------???
Probly going to take the oil catch can off and run it with this set up for a while , I think my rings have finally seated .
Click to expand...
5 inches of mercury equals 68 inches of water column. IMO that is excessive.
If I had to make a educated guess I would venture to say you have an internal vacuum leak causing high crankcase vacuum.
Let me ask, do you have a hard time getting the engine to idle down? Like to 750 rpm?
 
512Stroker said:
5 inches of mercury equals 68 inches of water column. IMO that is excessive.
If I had to make a educated guess I would venture to say you have an internal vacuum leak causing high crankcase vacuum.
Let me ask, do you have a hard time getting the engine to idle down? Like to 750 rpm?
Click to expand...

SURELY U JEST , NO VACUUM LEAKS , AND NO , A SOLID .600 LIFT STREET ROLLER w/ 250 duration at .050 , will not idle down to 750. I could get it to idle down a bit more , but doesn`t deem to benefit anywhere , ''vacuum leak causing hi vacuum'' , ----------you`ll have to explain that one to me .
I think the good vacuum is from the gapless rings ----------and a ''finally'' sealed up engine .
If it had a smaller cam , it could probly run power brakes , which I dont have .
It is running very well , and raps like a small block.
 
famous bob said:
SURELY U JEST , NO VACUUM LEAKS , AND NO , A SOLID .600 LIFT STREET ROLLER w/ 250 duration at .050 , will not idle down to 750. I could get it to idle down a bit more , but doesn`t deem to benefit anywhere , ''vacuum leak causing hi vacuum'' , ----------you`ll have to explain that one to me .
I think the good vacuum is from the gapless rings ----------and a ''finally'' sealed up engine .
If it had a smaller cam , it could probly run power brakes , which I dont have .
It is running very well , and raps like a small block.
Click to expand...
Bob I agree with ya crankcase vacuum is a good thing, but 5" is alot, it has to have a source creating it. The only source that can create that much vacuum is the induction system. Hence my statement " you have an internal vacuum leak causing high CRANKCASE vacuum".
My thought is that you may have an intake manifold vacuum leaking into the crankcase.
We can throw all of this out the window if you are running a vacuum pump and or a header e-vac system or just call me Nuts.
Just for conversation how much intake manifold vacuum do you have at idle? What is your current idle speed?
 
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