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Vac pump breather #2720331
11/29/19 08:35 PM
11/29/19 08:35 PM
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel Offline OP
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rebel  Offline OP
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aotearoa
For those of you that run a vac pump, how do you control the oil from coming out the breather? On start up I have 3" of vac & its regulated to 10" of vac, on full rpm. There are 2x lines with baffles that pull the air from the front of the rocker covers. Every run we get maybe a tablespoon of oil from the catch can but it always has about 2x tablespoons of oil dripping off the filter. Can anyone enlighten me on how to stop the mess I have to clean after every run?

20191125_210347.jpg
Re: Vac pump breather [Re: rebel] #2720343
11/29/19 09:33 PM
11/29/19 09:33 PM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
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I baffled my overflow can with the stainless steel kitchen pan scrubbies. Still not perfect. Epoxied a lip under the filter so the oil would drain off it back inside. Finally cut off the tops of old socks and slid them over the filter. Wash it out every 20 passes or so.
Doug

Re: Vac pump breather [Re: dvw] #2720344
11/29/19 09:39 PM
11/29/19 09:39 PM
Joined: Jan 2003
Posts: 4,267
Morrow, OH
markz528 Offline
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Morrow, OH
Someone taught me years ago to put a wrist sweat band around the filter. For me it works fantastic.

Example:

https://www.amazon.com/WILLBOND-Swe...+sweatband&qid=1575077954&sr=8-4


67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
Re: Vac pump breather [Re: markz528] #2720362
11/29/19 11:13 PM
11/29/19 11:13 PM
Joined: Sep 2003
Posts: 1,049
San Jose Ca.
boatracer572 Offline
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boatracer572  Offline
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San Jose Ca.
This is what I use, my motor pulls over 20” of vacuum every run, these socks work!!

BB66F154-930C-4585-BE20-6853FEC1B762.jpeg
Re: Vac pump breather [Re: rebel] #2720366
11/29/19 11:25 PM
11/29/19 11:25 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
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Bend,OR USA
I had a long baffle welded below the vacuum pickup fitting after having the same issues on my new motor this year up I had to tie rap a rag around it at the races once this year to stop the dripping rant The old motor with a different valve cover set up never had any oil drip out of the breather, never work I use one vacuum line to the valve cover per GZ instruction with the relief valve beside it also
My motors barely have any vacuum at idle and only 5 to 6 inches revved up so the pump will go back for rebuilding this winter, I would like to see 10 to 15 inches revved up luck

Last edited by Cab_Burge; 11/29/19 11:30 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Vac pump breather [Re: Cab_Burge] #2720389
11/30/19 06:56 AM
11/30/19 06:56 AM
Joined: Jan 2003
Posts: 2,902
A shed in England
Tig Offline
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A shed in England
I see many cars with the regulator on the engine side. This means air flows through the engine drawing oil mist through. Mounting the regulator post engine will minimize flow through the engine. It's mainly water that comes out when i drain the catch can.


'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Vac pump breather [Re: Tig] #2720491
11/30/19 06:26 PM
11/30/19 06:26 PM
Joined: Feb 2003
Posts: 989
Addison,IL
OUTLAWSSAA Offline
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Addison,IL
Wrist band
[Linked Image]

Re: Vac pump breather [Re: OUTLAWSSAA] #2720910
12/02/19 03:33 PM
12/02/19 03:33 PM
Joined: Jan 2003
Posts: 19,304
Las Vegas
Al_Alguire Offline
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Las Vegas
Nothing but steam in mine. I ran it 41 passes and just drained it for the first time. A few drops of water/oil in it, maybe a tbsp. I think a lot of the large amounts of oil many see are from engine that are not sealed well or have poor oil control. FWIW I do not regulate any of mine.


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: Vac pump breather [Re: Al_Alguire] #2720926
12/02/19 04:05 PM
12/02/19 04:05 PM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Online content
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an8sec70cuda  Online Content
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Marion, South Carolina [><]
I don't have a problem w/ this either. I have a Moroso 4 vane pump and the regulator is mounted on the inlet of the pump. I use an Aerospace components catch can.
There's never much in the can, but I drain it after I get home from the track. Mostly water and a little oil.


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
Re: Vac pump breather [Re: Al_Alguire] #2720975
12/02/19 06:37 PM
12/02/19 06:37 PM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
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Originally Posted by Al_Alguire
Nothing but steam in mine. I ran it 41 passes and just drained it for the first time. A few drops of water/oil in it, maybe a tbsp. I think a lot of the large amounts of oil many see are from engine that are not sealed well or have poor oil control. FWIW I do not regulate any of mine.


Al, How do you run your rear main seal? I suspect mine pulls air there.
Doug

Re: Vac pump breather [Re: dvw] #2721096
12/03/19 09:25 AM
12/03/19 09:25 AM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Online content
I Live Here
an8sec70cuda  Online Content
I Live Here

Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
FWIW...I run a normal Fel-Pro rear main seal installed in the normal orientation. Same w/ the front seal. Some people turn them around backwards, but I've never tried it. Same w/ the SB chevy we run.


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
Re: Vac pump breather [Re: an8sec70cuda] #2721459
12/04/19 08:14 PM
12/04/19 08:14 PM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Frostbitefalls MN (Rocky&Bullw...
I run two breathers. That along with a baffled vacuum line from the front of a valvecover. I run pushrod oiling AND spraybar oiling which puts a lot of oil mist in the motor. If you have enough pump capcity to need a vacuum regulater then you are running more air through the motor and carring mist to the pump with it. Reducing pump speed till you need little or no regulater will reduce oil coming out of the pump. I don't need a regulater to get 10 inchs of vacuum, as much as i want. Not using a regulater also makes it easier to spot problems. If the vacuum is less during a run, time to look for trouble. My last outing vacuum dropped. The pan bolts were loose. No more cork gaskets for me! I had checked them twice and the gaskets still compressed more.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Vac pump breather [Re: dvw] #2721471
12/04/19 08:50 PM
12/04/19 08:50 PM
Joined: Feb 2008
Posts: 710
Central TEXAS!!!!
sr4440 Offline
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Originally Posted by dvw
Originally Posted by Al_Alguire
Nothing but steam in mine. I ran it 41 passes and just drained it for the first time. A few drops of water/oil in it, maybe a tbsp. I think a lot of the large amounts of oil many see are from engine that are not sealed well or have poor oil control. FWIW I do not regulate any of mine.


Al, How do you run your rear main seal? I suspect mine pulls air there.
Doug


I am with Al, nothing but water, have 11 inches at idle, 17 downtrack, double lip seal on the rear main (fastfish), the timing chain cover seal has 2 springs and the backside was filled with RTV (cured) before being installed. If i had a Jesel belt drive it would seal better.


Joe



Without Data, you’re just another guy with an opinion.
Re: Vac pump breather [Re: sr4440] #2721574
12/05/19 07:30 AM
12/05/19 07:30 AM
Joined: Oct 2004
Posts: 3,097
back in Georgia
dthemi Offline
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back in Georgia
I have a motor that I intentionally over oil through the pushrods, and use almost unrestricted spray bars as well. I did it t see how much better the spring life would be. Even with 2 pickup points on the covers it would flood the vacuum system with oil. I went to my default breather attachments, Z baffle burn down breathers that you see mostly on blown alky stuff. They're ugly, and stick way up, but even on that oil derrick all I get is water smoke.

These things are a cure all for oil geyser vacuum systems.

https://www.goodvibrationsmotorsports.com/Burndown-Breathers-Aluminum-Female-AN16.aspx

Re: Vac pump breather [Re: dthemi] #2721676
12/05/19 01:26 PM
12/05/19 01:26 PM
Joined: Jan 2003
Posts: 19,304
Las Vegas
Al_Alguire Offline
I Live Here
Al_Alguire  Offline
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Las Vegas
I run nothing fancy for a rear main oil seal and it is installed in the standard manner. My engine seen 19+-" of vacuum and the dragster is a tad more. These are both big stroke deals.


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: Vac pump breather [Re: Al_Alguire] #2721827
12/05/19 08:19 PM
12/05/19 08:19 PM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
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Ill air it up and check for leaks. I see no oil leaking externally. Gets about 4oz in 25 passes
Doug







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