Re: Best vac pump inlet location?
[Re: dakotahotrodder]
#2996222
12/17/21 07:22 PM
12/17/21 07:22 PM
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Joined: Feb 2004
Posts: 34,886 S.E. South Dakota !
bigdad
Still Posting A Lot
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Still Posting A Lot
Joined: Feb 2004
Posts: 34,886
S.E. South Dakota !
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I tried several things till I found the right spot ..
Middle of V/C ..intake side , I no longer have pics but, did a little fancy gizmo to make it look neat ..
Not what works for one will work for another, your lost without a gauge, took lots of trial and error
On dyno worked great if front of v/c .. at track it did not
The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6
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Re: Best vac pump inlet location?
[Re: dakotahotrodder]
#2996281
12/17/21 09:55 PM
12/17/21 09:55 PM
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Joined: Aug 2003
Posts: 43,174 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,174
Bend,OR USA
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I put mine at the front of the passenger side valve cover as far forward and on top of the cover with the bypass valve beside it per the instructions from the manufacturer. I did make and have a flat aluminum baffle welded under them, but the welds broke, and the motor didn't seem to suck any more oil into the vent tank after removing the baffle and racing it without the baffle ![shruggy shruggy](/ubbthreads/images/graemlins/custom/shruggy.gif)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Best vac pump inlet location?
[Re: dakotahotrodder]
#2996376
12/18/21 11:14 AM
12/18/21 11:14 AM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Vacuum at the valve cover interferes with oil drain from the head. Ideally, it should be in the air space above the oil in the pan.
Boffin Emeritus
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Re: Best vac pump inlet location?
[Re: Moparite]
#2996437
12/18/21 01:23 PM
12/18/21 01:23 PM
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Joined: Apr 2003
Posts: 3,510 Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,510
Tulsa, Oklahoma
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In my opinion not near as effective. What will those pull a couple of inches of vacuum as opposed as much as you want with a good pump setup. Also for what its worth I pull from the top front of the driver's side valve cover, no baffle and little oil in the tank.
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Re: Best vac pump inlet location?
[Re: dakotahotrodder]
#2996439
12/18/21 01:27 PM
12/18/21 01:27 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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IMO it depends on the heads being used. We have them in the front of the cover, top of the cover, intake side of the cover, depending on cylinder head being used. Our current engines have two in the front of the cover with no baffle and one in the top oft he cover. None of them pull any oil really usually just some condensation and maybe a drop or two of oil. But we don't have any external leaks either.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Best vac pump inlet location?
[Re: dakotahotrodder]
#2996496
12/18/21 03:54 PM
12/18/21 03:54 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
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Las Vegas
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With a =1 head and Indy oiling, which I assume you have it will make little difference where it is. We have run that combo a few different times with just a fitting in the cover with no issues at all. This was a -1 headed 446 with the fitting in the top of the cover at 11" of vacuum never any oil in the tank. ![[Linked Image]](https://i.postimg.cc/Fzznm8NW/40-B5-F149-50-A3-4-ACD-AEAC-9329967794-AA.jpg)
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Best vac pump inlet location?
[Re: dakotahotrodder]
#2997099
12/20/21 05:30 PM
12/20/21 05:30 PM
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Joined: Feb 2013
Posts: 154 Canada
cuda499
member
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member
Joined: Feb 2013
Posts: 154
Canada
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Where have you guys put your inlet for your vacuum pumps? I got an Aerospace pump for my big block and they recommend the front of the valve cover with no baffle, but I was thinking of installing it mid valve cover on the intake side. Any suggestions and pic's of your set ups would be great, thanks! Switched mine from valve cover to lifter valley, and it filled the catch can every time I stood on it lol. Switched it back to valve cover.
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Re: Best vac pump inlet location?
[Re: Ian]
#2997585
12/22/21 01:28 PM
12/22/21 01:28 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
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Posts: 19,363
Las Vegas
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FWIW I have NEVER seen the valley plate to be a good location. Alot of oil flying around in there at RPM and if you are pulling any real amount of vacuum its gonna make a mess in short order.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Best vac pump inlet location?
[Re: Al_Alguire]
#3003000
01/07/22 08:16 PM
01/07/22 08:16 PM
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Joined: Jan 2003
Posts: 10,022 MN
JERICOGTX
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I Live Here
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MN
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FWIW I have NEVER seen the valley plate to be a good location. Alot of oil flying around in there at RPM and if you are pulling any real amount of vacuum its gonna make a mess in short order. Can the valley plate area be used for the relief?
69 GTX
68 Road Runner
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Re: Best vac pump inlet location?
[Re: JERICOGTX]
#3003042
01/07/22 10:10 PM
01/07/22 10:10 PM
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Joined: Aug 2003
Posts: 43,174 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,174
Bend,OR USA
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FWIW I have NEVER seen the valley plate to be a good location. Alot of oil flying around in there at RPM and if you are pulling any real amount of vacuum its gonna make a mess in short order. Can the valley plate area be used for the relief? Why not? ![work work](/ubbthreads/images/graemlins/custom/work.gif)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Best vac pump inlet location?
[Re: JERICOGTX]
#3003198
01/08/22 03:22 PM
01/08/22 03:22 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
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Posts: 19,363
Las Vegas
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Can the valley plate area be used for the relief?
IMO no reson to regulate it unless you are the paranoid type. Especially with a 3 vane pump, in that case there is ZERO reason to run a regulator
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Best vac pump inlet location?
[Re: Cab_Burge]
#3003200
01/08/22 03:26 PM
01/08/22 03:26 PM
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Joined: Sep 2003
Posts: 19,405 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,405
north of coder
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FWIW I have NEVER seen the valley plate to be a good location. Alot of oil flying around in there at RPM and if you are pulling any real amount of vacuum its gonna make a mess in short order. Can the valley plate area be used for the relief? Why not? that kind of example would be the breather/oil fill tube on chevy engines over many years. i have even seen PVC valves plumbed into oil fill tubes [with no breather] on certain POBC engines over the years. ![beer beer](/ubbthreads/images/graemlins/custom/beer.gif)
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