Oil Coming Out Of Oil Breathers Help
#2522608
07/16/18 03:42 PM
07/16/18 03:42 PM
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Joined: Dec 2006
Posts: 388 Southington, Ohio
dm69charger
OP
enthusiast
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OP
enthusiast
Joined: Dec 2006
Posts: 388
Southington, Ohio
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I am getting oil out of the oil breathers on top of the valve covers. They are located towards the front of the engine near the intake on both passenger and driver's side. The valve covers have baffles in them.
Specs: 1969 Dodge Charger, 540 cui Hemi, Megablock, 4.375 bore x 4.5 stroke, Internal pickup for oiling, Miloden oil pan with windage tray, Indy 426-1 Aluminum heads, Solid roller cam, Valve lift .61 intake and exhaust, Indy cast aluminum valve covers, Open oil breathers with baffles, Fresh build, maybe 2,000 miles on it. Some track time. Block was worked, gone through by my machinist, and final torque honed. Rings were file fit according to the instructions.
I haven't done a compression test or leak down test to know if it is blow-by. I was wondering if there was anything else I should check (consider) while I'm at it?
I did not put in the oil restrictors in the heads because I had read horror stories about not enough oil to the top end on Hemis. I was thinking that it was on the safer side to have more oil than less? Should I put them in?
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2522614
07/16/18 03:44 PM
07/16/18 03:44 PM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Do not put oil return restrictor in your heads Do you oil the rocker arms full time with your roller cam? How big are the baffles under your breather caps?
Last edited by Cab_Burge; 07/16/18 03:45 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2522650
07/16/18 04:39 PM
07/16/18 04:39 PM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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When did this start? What change (if any) was done before that?
Boffin Emeritus
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2522669
07/16/18 05:21 PM
07/16/18 05:21 PM
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Joined: Dec 2005
Posts: 11,611 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,611
Fulton County, PA
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If it was OK, and then it was not, something has changed in the engine. Leak it would be the first thing to do.
If the results don't match the theory, change the theory.
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Re: Oil Coming Out Of Oil Breathers Help
[Re: Thumperdart]
#2522765
07/16/18 08:22 PM
07/16/18 08:22 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Have you pulled the covers off yet to see if the baffles have plenty of clearance.. if they get pushed partly closed from the rockers then you will build pressure in the covers
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2522831
07/16/18 10:27 PM
07/16/18 10:27 PM
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Joined: Jan 2003
Posts: 7,495 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,495
Minnesota
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I think you did the right thing by not restricting oil to the heads. I usually groove the #4 cam journal to get more oil to the heads on a street motor with stiff roller cam springs. I've smoked too many rockers and push rods to not.
As for the blowby, I agree with Andy, this motor is going to have some. Work on better baffles.
GOod luck! Joel
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Oil Coming Out Of Oil Breathers Help
[Re: Hemi_Joel]
#2522964
07/17/18 08:39 AM
07/17/18 08:39 AM
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Joined: Mar 2010
Posts: 984 Tennessee
Hemi ragtop
super stock
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super stock
Joined: Mar 2010
Posts: 984
Tennessee
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I think you did the right thing by not restricting oil to the heads. I usually groove the #4 cam journal to get more oil to the heads on a street motor with stiff roller cam springs. I've smoked too many rockers and push rods to not.
As for the blowby, I agree with Andy, this motor is going to have some. Work on better baffles.
GOod luck! Joel I see both Andy and now Joel comment on the size of the engine "it's going to have blow by". So is a 4.375 x 4.5 Hemi going to use oil due to it's size? See my post earlier on my engine, same size, and oil consumption. Oddly enough I have no blow by, installed a trap in PVC line to check and it never collected oil?
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2522994
07/17/18 10:50 AM
07/17/18 10:50 AM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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Oh, wait - I already posted 10,000 words on this, and no one read it. My bad.
Boffin Emeritus
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2523104
07/17/18 03:25 PM
07/17/18 03:25 PM
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Joined: Jan 2003
Posts: 13,374 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,374
Marion, South Carolina [><]
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There's likely nothing wrong w/ the motor, just the nature of the beast. That big motor is gonna make a lot of crankcase pressure and there's gonna be a lot of oil mist in there. I know, my 572" hemi did it the first time I drove it w/ just two open element breathers on the valve covers. I added baffles and got the Mr. Gasket breathers that sit up above the covers w/ tubes, then added steel wool inside the tubes...which helped a lot, but still ended up leaking oil if you drove it hard. I eventually put a vacuum pump on the motor, which cured it. Having said that, I don't think you need a pump to fix it.
My other car is a wedge, but I use a pair of -10 lines from each valve cover that "tee" into a breather tank mounted beside the radiator. This setup works great, no leaks, and much less expensive than a vacuum pump. See pic...
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2523125
07/17/18 03:57 PM
07/17/18 03:57 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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If its smoking that bad you most likely have a broken ring.. OR the intake is sucking in oil that would be where I looked
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Re: Oil Coming Out Of Oil Breathers Help
[Re: dm69charger]
#2523144
07/17/18 04:24 PM
07/17/18 04:24 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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The large diameter of the systems on those NASCAR will drop the air velocity and IF your pulling oil out of the breathers it will help a ton.. it really slows the air down
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