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Re: oil pressure fluctuations
[Re: slickrock]
#1772474
03/05/15 07:21 PM
03/05/15 07:21 PM
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Joined: Jan 2003
Posts: 25,743
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,743
Rio Linda, CA
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Factory gauge? What RPM when the pressure drops?
The INTERNET, the MISinformation superhighway
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Re: oil pressure fluctuations
[Re: slickrock]
#1772478
03/05/15 07:29 PM
03/05/15 07:29 PM
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Joined: Nov 2003
Posts: 549
WV
JohnH
mopar
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mopar
Joined: Nov 2003
Posts: 549
WV
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If there is not one there, very could be your problem,, the higher the RPM the more wind off the crank.. It's foaming the oil.. If there is one on there you will see the side of it,, along with 2 oil pan gaskets..
Last edited by JohnH; 03/05/15 07:32 PM.
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Re: oil pressure fluctuations
[Re: Pacnorthcuda]
#1772482
03/05/15 07:47 PM
03/05/15 07:47 PM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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I like to check the simple things first.
Stock gauge or mechanical?
Have you tried a different gauge or sender unit?
Stock pan should hold 5 quarts of oil.
I always put in 6. 1 for the filter.
I have mechanical Aptitude.
I can screw up anything.
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Re: oil pressure fluctuations
[Re: slickrock]
#1772484
03/05/15 08:03 PM
03/05/15 08:03 PM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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I'd make sure the gauge is working before digging into the motor. Worth a shot, right? 
I have mechanical Aptitude.
I can screw up anything.
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Re: oil pressure fluctuations
[Re: bboogieart]
#1772485
03/05/15 08:05 PM
03/05/15 08:05 PM
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Joined: Jan 2003
Posts: 5,357
Rancho Cordova, California (Sa...
hemi71x
master
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master
Joined: Jan 2003
Posts: 5,357
Rancho Cordova, California (Sa...
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Quote:
I like to check the simple things first.
Stock gauge or mechanical?
Have you tried a different gauge or sender unit?
Stock pan should hold 5 quarts of oil.
I always put in 6. 1 for the filter.
Incorrect.
A stock pan holds 4 quarts of oil, and one for the filter.
Page 9-98 in the specifications section, of the 1970 factory service manual.
Last edited by hemi71x; 03/05/15 08:10 PM.
RF-4C Phantom 69-370 Zweibrucken, Germany
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Re: oil pressure fluctuations
[Re: slickrock]
#1772495
03/05/15 08:37 PM
03/05/15 08:37 PM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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I'd hook up a cheap after market mechanical gauge, cause it would be the easiest and cheapest to do. Wouldn't even have to mount it, if you want to keep the dash stock. If it shows the same symptoms then no need to dig into the dash to replace the factory gauge.
I'm kinda leaning towards the pick up tube next. Loose or cracked.
I have mechanical Aptitude.
I can screw up anything.
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Re: oil pressure fluctuations
[Re: JohnH]
#1772499
03/05/15 11:50 PM
03/05/15 11:50 PM
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Joined: Nov 2007
Posts: 21,818
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,818
Kirkland, Washington
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Quote:
Also, my 440 I put a "T" coming-out of the block for the oil pressure.I have the factory gage, and I also installed a direct pressure gage. The factory says 20 psi,, and the direct stays at 50psi.. But you do have two places to install oil pressure gages back there if you don't want to T it off, If you install a direct gage, which I recommend get copper tubing, don't use that plastic. I feel strongly there is no windage tray on that block,, but like every one is saying get a direct gage..
What factory (Mopar 440 equipped) gauge has PSI readings on it??? 
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Re: oil pressure fluctuations
[Re: Pacnorthcuda]
#1772500
03/06/15 01:43 AM
03/06/15 01:43 AM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,439
So Cal
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Quote:
Quote:
Also, my 440 I put a "T" coming-out of the block for the oil pressure.I have the factory gage, and I also installed a direct pressure gage. The factory says 20 psi,, and the direct stays at 50psi.. But you do have two places to install oil pressure gages back there if you don't want to T it off, If you install a direct gage, which I recommend get copper tubing, don't use that plastic. I feel strongly there is no windage tray on that block,, but like every one is saying get a direct gage..
What factory (Mopar 440 equipped) gauge has PSI readings on it???
My 70RR has PSI readings on the OE oil guage...
Just my $0.02... 
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Re: oil pressure fluctuations
[Re: Sinitro]
#1772501
03/06/15 02:13 AM
03/06/15 02:13 AM
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Joined: Nov 2003
Posts: 549
WV
JohnH
mopar
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mopar
Joined: Nov 2003
Posts: 549
WV
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Quote:
Quote:
Quote:
Also, my 440 I put a "T" coming-out of the block for the oil pressure.I have the factory gage, and I also installed a direct pressure gage. The factory says 20 psi,, and the direct stays at 50psi.. But you do have two places to install oil pressure gages back there if you don't want to T it off, If you install a direct gage, which I recommend get copper tubing, don't use that plastic. I feel strongly there is no windage tray on that block,, but like every one is saying get a direct gage..
What factory (Mopar 440 equipped) gauge has PSI readings on it???
My 70RR has PSI readings on the OE oil guage... My 69 Charger has PSI
Just my $0.02...
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Re: oil pressure fluctuations
[Re: Pacnorthcuda]
#1772502
03/06/15 02:14 AM
03/06/15 02:14 AM
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Joined: Nov 2003
Posts: 549
WV
JohnH
mopar
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mopar
Joined: Nov 2003
Posts: 549
WV
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Quote:
Quote:
Remember a 440 is a dry sump engine,
Umm, no its not.
Ummm yes it is..
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Re: oil pressure fluctuations
[Re: slickrock]
#1772505
03/06/15 05:04 AM
03/06/15 05:04 AM
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Joined: Aug 2003
Posts: 43,115
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,115
Bend,OR USA
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It sounds like it is time for you to find out exactly how much oil is in your engine now and how much it should have. Drain the oil with the motor hot or at least warm and measure it, write it down and then look at the oil pan and see if it has any numbers stamped into or on the oil pan anywhere  If it does let us know those numbers, Mopar had two different stock oil pans on the BB and Hemi motors in 1970 and 1971  The common production "402' oil pan and the 1970/71 only 426 street hemi and 440 6 pak oil pan If you oil pan doesn't have any numbers stamp into it measure the depth of it at the back of the sump where the oil drain plug is, measure from the engine block down to the bottom of the oil pan and the length and width of the center oil sump and let us know those measurements The common misconception on the proper amount of oil in the stock 402 oil pans originates from factory service manuals that said 4 quarts, they had the wrong amount in them  It show 4 quarts plus one for the oil filter, Mopar sent out several diffeent service bulletins over the years correcting that to be 5 quarts plus one for the oil filter the 1970/1971 426 street Hemi and 440- 6 pak oil pans hold 6 quarts plus one for the oil filter, that is the best stock oil pan to use in any 1966 to 1971 B and E body with a B or RB or Street Hemi motor in those cars You need the matching oil pick up also to use those pans correctly to prevent oil starvation.Let us know what you find out, I always add the proper amount of oil to the motors I build and then make sure the oil dipstick is showing full with the correct amount of oil in them, if not reading correctly I correct and calibrate the dipstick so it reads correctly I learned a very hard lesson years ago on a car I took in trade, the Mopar chrome dipstick showed the motor to be around a half a quart over full when it only had two and half quarts of oil in the oil pan  I ended up spinning a rod bearing in that motor due to oil starvation  I now drain and verify all the motors I take in that I didn't build to start with No matter who built them, verify, verify and reverify to make sure you know exactly what you have IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: oil pressure fluctuations
[Re: dynorad]
#1772508
03/06/15 04:12 PM
03/06/15 04:12 PM
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Joined: Feb 2005
Posts: 4,310
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,310
Prospect, PA
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Quote:
When the oil pressure says "0" are your rods knocking? If not that would point to incorrect pressure gauge.
if it has hydraulic lifters you would think those would be clattering pretty good....
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Re: oil pressure fluctuations
[Re: 71birdJ68]
#1772511
03/06/15 10:31 PM
03/06/15 10:31 PM
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Joined: Feb 2012
Posts: 4,446
Morristown Tn.
71birdJ68
master
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master
Joined: Feb 2012
Posts: 4,446
Morristown Tn.
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Quote:
Quote:
Quote:
Has any of the wiring from the sending unit to the harness been changed, or messed with? The resistance wire might be missing, that is if a 70 model had that feature.
There are no resistance wires in a MoPar wiring harness.
My 71 has it, and it is in the wiring diagram in the service manual. Look at the 71 Hemi engine wiring diagram.
I asked Frank Badalson about this resistance wire I was talking about, and he said all 70-71s with rally gauges have this wire to insure proper pressure indicating system operation. So, there.
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Re: oil pressure fluctuations
[Re: 71birdJ68]
#1772512
03/06/15 10:43 PM
03/06/15 10:43 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Quote:
Quote:
Quote:
Quote:
Has any of the wiring from the sending unit to the harness been changed, or messed with? The resistance wire might be missing, that is if a 70 model had that feature.
There are no resistance wires in a MoPar wiring harness.
My 71 has it, and it is in the wiring diagram in the service manual. Look at the 71 Hemi engine wiring diagram.
I asked Frank Badalson about this resistance wire I was talking about, and he said all 70-71s with rally gauges have this wire to insure proper pressure indicating system operation. So, there.
I asked Donald Duck and he said Frank who? So there.
I only have the 71 body FSM, so there are no engine compartment diagrams available to me. My 70 FSM does not show this wire, nor does my 72. And yes, I looked at the rallye cluster diagrams.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: oil pressure fluctuations
[Re: Supercuda]
#1772513
03/06/15 11:03 PM
03/06/15 11:03 PM
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Joined: Feb 2012
Posts: 4,446
Morristown Tn.
71birdJ68
master
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master
Joined: Feb 2012
Posts: 4,446
Morristown Tn.
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In the 71 Plymouth, Chrysler FSM it is in the Hemi engine wiring diagram page 8-157 Fig 13. where it shows the sending unit, and it is a separate wire that can get lost. Frank is Roger Gibsons partner, and they do some of the most accurate restorations around, and they also sell some of the most accrete repro parts there is. They sell this resistance wire. The gage can fluctuate without it. That's why I asked the OP if it was missing. And everybody knows Donald Duck is a ferry, and that Daffy Duck more of a mans duck.
Last edited by 71birdJ68; 03/06/15 11:06 PM.
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FWIW a dry sump oil system does not store or use any of the oil caught in the oil pan for pressure, the dry sump oil pump sucks all the oil out of the oil pan and blows it into a storage tank( through indidvidual exteranl oil lines) that has oil and air seperators in it and then allows the oil to be suck down into the oil pump through another hose and the pump pumps it back into the motor through another external oil line 
