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oil pressure fluctuations #1772471
03/05/15 07:14 PM
03/05/15 07:14 PM
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oklahoma
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slickrock Offline OP
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oklahoma
I have a 440 stroker in a 70 cuda that the oil pressure fluctuates in,i have tried an adjustable oil pressure regulator, and then a new melling oil pump, and different weights of oil. there seams to be no ryme or reason to it. Somedays everything is fine ,other days its good and then drops to close to 0 after reving for a while, when I go back to idle the pressure will slowly climb back up and then go back down when the engine revs again. anyone have any ideas? It has a stock oil pan.

Re: oil pressure fluctuations [Re: slickrock] #1772472
03/05/15 07:16 PM
03/05/15 07:16 PM
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Paul_Fancsali Offline
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You are sucking the pan dry or foaming the oil Is this a high volume pump?

Re: oil pressure fluctuations [Re: Paul_Fancsali] #1772473
03/05/15 07:18 PM
03/05/15 07:18 PM
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oklahoma
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slickrock Offline OP
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oklahoma
yes it is

Re: oil pressure fluctuations [Re: slickrock] #1772474
03/05/15 07:21 PM
03/05/15 07:21 PM
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Rio Linda, CA
John_Kunkel Offline
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Factory gauge? What RPM when the pressure drops?


The INTERNET, the MISinformation superhighway
Re: oil pressure fluctuations [Re: slickrock] #1772475
03/05/15 07:24 PM
03/05/15 07:24 PM
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WV
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JohnH Offline
mopar
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WV
Did you put a windage pan over the oil pan? If not that could be your problem.. Remember a 440 is a dry sump engine, The wind off the crank could be causing the oil pump to cavitate and causing it to just pump air and oil..

Re: oil pressure fluctuations [Re: John_Kunkel] #1772476
03/05/15 07:25 PM
03/05/15 07:25 PM
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oklahoma
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slickrock Offline OP
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oklahoma
factory gauge, I think it drops around 2500 or more. How many qts of oil should this engine take. I think its 493 cubic inches

Re: oil pressure fluctuations [Re: JohnH] #1772477
03/05/15 07:27 PM
03/05/15 07:27 PM
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oklahoma
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slickrock Offline OP
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I have never had the oil pan off< so I don't know about the tray

Re: oil pressure fluctuations [Re: slickrock] #1772478
03/05/15 07:29 PM
03/05/15 07:29 PM
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WV
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JohnH Offline
mopar
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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.
Re: oil pressure fluctuations [Re: JohnH] #1772479
03/05/15 07:37 PM
03/05/15 07:37 PM
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oklahoma
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slickrock Offline OP
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does anyone know how many qts of oil this engine takes?

Re: oil pressure fluctuations [Re: JohnH] #1772480
03/05/15 07:43 PM
03/05/15 07:43 PM
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oklahoma
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slickrock Offline OP
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I will take a look and see if I have a tray this weekend

Re: oil pressure fluctuations [Re: JohnH] #1772481
03/05/15 07:43 PM
03/05/15 07:43 PM
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Kirkland, Washington
Pacnorthcuda Offline
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Quote:

Remember a 440 is a dry sump engine,




Umm, no its not.

Re: oil pressure fluctuations [Re: Pacnorthcuda] #1772482
03/05/15 07:47 PM
03/05/15 07:47 PM
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bboogieart Offline
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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.
Re: oil pressure fluctuations [Re: bboogieart] #1772483
03/05/15 07:56 PM
03/05/15 07:56 PM
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oklahoma
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slickrock Offline OP
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stock gauge, I have not checked anything with the gauge

Re: oil pressure fluctuations [Re: slickrock] #1772484
03/05/15 08:03 PM
03/05/15 08:03 PM
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bboogieart Offline
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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.
Re: oil pressure fluctuations [Re: bboogieart] #1772485
03/05/15 08:05 PM
03/05/15 08:05 PM
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Rancho Cordova, California (Sa...
hemi71x Offline
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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

Re: oil pressure fluctuations [Re: slickrock] #1772486
03/05/15 08:06 PM
03/05/15 08:06 PM
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Iowa
burdar Offline
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Hook up a mechanical gauge to verify the pressure.

Re: oil pressure fluctuations [Re: bboogieart] #1772487
03/05/15 08:07 PM
03/05/15 08:07 PM
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Posts: 14
oklahoma
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slickrock Offline OP
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oklahoma
yes it is, Ill check all the suggestions and see what happens, Thanks

Re: oil pressure fluctuations [Re: burdar] #1772488
03/05/15 08:09 PM
03/05/15 08:09 PM
Joined: Sep 2007
Posts: 14,889
up yours
Supercuda Offline
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Quote:

Hook up a mechanical gauge to verify the pressure.




Do this first.

Stock gauges are not real precise, or accurate and when a stock sending unit starts going bad I've seen your symptoms.


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.
Re: oil pressure fluctuations [Re: slickrock] #1772489
03/05/15 08:09 PM
03/05/15 08:09 PM
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Posts: 4,443
Morristown Tn.
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71birdJ68 Offline
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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.

Re: oil pressure fluctuations [Re: 71birdJ68] #1772490
03/05/15 08:14 PM
03/05/15 08:14 PM
Joined: Sep 2007
Posts: 14,889
up yours
Supercuda Offline
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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.


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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