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Re: oil pressure fluctuations [Re: 71birdJ68] #1772491
03/05/15 08:14 PM
03/05/15 08:14 PM
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Posts: 14
oklahoma
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slickrock Offline OP
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oklahoma
don't know about the wiring, but ill try a stock guage

Re: oil pressure fluctuations [Re: slickrock] #1772492
03/05/15 08:17 PM
03/05/15 08:17 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

. 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.


(1) As said confirm true psi with a mech gauge (my guess bad elec gauge/sender) (2) toss in an extra 2 qts of oil on the chance the pickup is too far from the pan (not real likely but an easy check) & the extra slosh wont kill ya for a 1 day check. (3) if all good so far then the pan has to come off as zero psi (even briefly) ain't gonna cut it so you can dig in further but the ok/not ok makes me think elec gauge problem


live every 24 hour block of time like it's your last day on earth
Re: oil pressure fluctuations [Re: slickrock] #1772493
03/05/15 08:17 PM
03/05/15 08:17 PM
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Mesa, Arizona
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dart4forte Offline
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Don't rule out a possible crack in the pickup tube. They can crack from vibration.

Re: oil pressure fluctuations [Re: RapidRobert] #1772494
03/05/15 08:26 PM
03/05/15 08:26 PM
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oklahoma
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slickrock Offline OP
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oklahoma
extra oil and stock gauge are the first things ill try, hopefully one of those are the problem

Re: oil pressure fluctuations [Re: slickrock] #1772495
03/05/15 08:37 PM
03/05/15 08:37 PM
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bboogieart Offline
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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.
Re: oil pressure fluctuations [Re: bboogieart] #1772496
03/05/15 08:42 PM
03/05/15 08:42 PM
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oklahoma
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slickrock Offline OP
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sorry, I should have said aftermarket gauge, I knew what I was thinking , just not what I was saying

Re: oil pressure fluctuations [Re: slickrock] #1772497
03/05/15 08:55 PM
03/05/15 08:55 PM
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I have mechanical Aptitude.
I can screw up anything.
Re: oil pressure fluctuations [Re: bboogieart] #1772498
03/05/15 11:00 PM
03/05/15 11:00 PM
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Posts: 549
WV
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JohnH Offline
mopar
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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..

Re: oil pressure fluctuations [Re: JohnH] #1772499
03/05/15 11:50 PM
03/05/15 11:50 PM
Joined: Nov 2007
Posts: 21,808
Kirkland, Washington
Pacnorthcuda Offline
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Kirkland, Washington
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???

Re: oil pressure fluctuations [Re: Pacnorthcuda] #1772500
03/06/15 01:43 AM
03/06/15 01:43 AM
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So Cal
Sinitro Offline
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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...

Re: oil pressure fluctuations [Re: Sinitro] #1772501
03/06/15 02:13 AM
03/06/15 02:13 AM
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Posts: 549
WV
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JohnH Offline
mopar
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WV
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...



Re: oil pressure fluctuations [Re: Pacnorthcuda] #1772502
03/06/15 02:14 AM
03/06/15 02:14 AM
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Posts: 549
WV
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JohnH Offline
mopar
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Quote:

Quote:

Remember a 440 is a dry sump engine,




Umm, no its not.


Ummm yes it is..

Re: oil pressure fluctuations [Re: Supercuda] #1772503
03/06/15 03:14 AM
03/06/15 03:14 AM
Joined: Feb 2012
Posts: 4,443
Morristown Tn.
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71birdJ68 Offline
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Morristown Tn.
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.

Last edited by 71birdJ68; 03/06/15 03:36 AM.
Re: oil pressure fluctuations [Re: JohnH] #1772504
03/06/15 04:40 AM
03/06/15 04:40 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Quote:

Quote:

Quote:

Remember a 440 is a dry sump engine,




Umm, no its not.


Ummm yes it is..


Dude, do you know what a dry sump oil system is or looks like? Evindently you think you do Evidently your wrong Google it and look at it carefully and then let us know what you find out 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 The initial cost on a decent dry sump system starts around $3000.00 the last I heard Not something commonly found on mass produced automotive engines


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: oil pressure fluctuations [Re: slickrock] #1772505
03/06/15 05:04 AM
03/06/15 05:04 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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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)
Re: oil pressure fluctuations [Re: Cab_Burge] #1772506
03/06/15 01:08 PM
03/06/15 01:08 PM
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Posts: 3,398
Dandridge TN
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Dabee Offline
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Listen to what Cab is saying. He's is 100% right one. One other thing on the question of how much oil the pan holds. He said its a stroked 440, I betting he has an aftermarket pan on that engine. Most likely an 8 quart pan.

Re: oil pressure fluctuations [Re: Dabee] #1772507
03/06/15 02:48 PM
03/06/15 02:48 PM
Joined: Jan 2003
Posts: 512
Niwot, CO Formerly denn...
dynorad Offline
mopar
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Niwot, CO Formerly denn...
When the oil pressure says "0" are your rods knocking? If not that would point to incorrect pressure gauge.

Re: oil pressure fluctuations [Re: dynorad] #1772508
03/06/15 04:12 PM
03/06/15 04:12 PM
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Prospect, PA
BSB67 Offline
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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....

Re: oil pressure fluctuations [Re: BSB67] #1772509
03/06/15 05:12 PM
03/06/15 05:12 PM
Joined: Mar 2015
Posts: 14
oklahoma
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slickrock Offline OP
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I do not hear any knocking, no noticeable change in engine sounds

Re: oil pressure fluctuations [Re: BSB67] #1772510
03/06/15 10:11 PM
03/06/15 10:11 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
Circle Track
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Quote:

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....


Exactly! Ding ding ding I do believe we have a winna. they would be clattering for sure & further points to a faulty gauge/sender rather than actual psi


live every 24 hour block of time like it's your last day on earth
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