Re: Hemi Oil Pressure Range
[Re: DaveRS23]
#2994030
12/10/21 01:05 PM
12/10/21 01:05 PM
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Joined: Jun 2015
Posts: 315 Northeast Indiana
73DAD
enthusiast
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enthusiast
Joined: Jun 2015
Posts: 315
Northeast Indiana
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Think of how someone would prove this is even a real issue. It would be a pain in the butt. A sight window or sight tube on the side of the pan with a camera mounted in the engine bay, while a willing participant launches the car knowing full well they might starve their bearings and ruin the engine. I suppose someone could do it on a test stand too if they were nice enough and had extra time on their hands.
I don't know about you, but I've never heard of anybody testing this claim, and I think its perfectly reasonable to be skeptical until someone presents some evidence. Trashed bearings by themselves are not good enough. Quite a few things can ruin a bearing. Drain back problems on Hemis is a well known and proven potential problem. And many of us have 'tested' this theory. Having the oil pressure drop off on the big end or at shut down is a real world test. In addition to the factory dash gauge, I have always teed in a 15lbs pressure switch with a warning light in the dash so that I have a heads up that the oil pressure is dropping. I have had to adjust things several times on my Hemis to stop the light from coming on at the end of the track and has probably saved me an engine or two over the years. Now, I keep an accumulator plumbed in when running a stock pan which pretty much puts the issue to bed. 'Skeptical' means I'm suspicious of its veracity. Not that I disagree. I can't accept it as true without evidence. Oil subjected to the G-forces of a drag race can pile up in the back of a pan, show low oil pressure, and have nothing to do with pumping the sump dry.
Last edited by 73DAD; 12/10/21 01:05 PM.
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Re: Hemi Oil Pressure Range
[Re: dodgefarmer]
#2994035
12/10/21 01:29 PM
12/10/21 01:29 PM
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Joined: Feb 2007
Posts: 217 New Port Richey, Florida
Wolfe440
OP
enthusiast
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OP
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Posts: 217
New Port Richey, Florida
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Being recently rebuilt, would it have had a new Melling M-63 oil pump installed? If so remove the "new standard" pink spring and replace it with the older BB oil pump original standard black spring. The last 3 that I have done idle at 25-28 psi hot. If that does not work then you probably do have increased bearing clearance, which is totally understandable for a Hemi.
HTH Randy Looks like a new Melling, and that is what I did, I took out the pink spring and installed black one one from a older pump which seemed to increase the top end pressure a bit, and the speed of increase but idle pressure stayed about the same. I will try a straight 30w and see if it can give me above 20ps, I can live with that. Not high volume but changing to a high pressure pump...would that bring up the idle pressure?
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Re: Hemi Oil Pressure Range
[Re: Wolfe440]
#2994043
12/10/21 01:44 PM
12/10/21 01:44 PM
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Joined: Jan 2003
Posts: 12,295 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,295
Benton, IL.
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A high pressure pump is only one with a stiffer spring. Again, it will have no impact on your idle oil pressure. The spring simply sets the max pressure that is allowed and then all the pressure after than to sent back to the pan along with it's volume.
Master, again and still
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Re: Hemi Oil Pressure Range
[Re: DaveRS23]
#2994055
12/10/21 02:28 PM
12/10/21 02:28 PM
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Joined: Feb 2007
Posts: 217 New Port Richey, Florida
Wolfe440
OP
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OP
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Posts: 217
New Port Richey, Florida
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A high pressure pump is only one with a stiffer spring. Again, it will have no impact on your idle oil pressure. The spring simply sets the max pressure that is allowed and then all the pressure after than to sent back to the pan along with it's volume.
Ok thanks.I'm going to try the 30w and see if I can get a bump in pressure up to 20+.
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Re: Hemi Oil Pressure Range
[Re: Wolfe440]
#2994065
12/10/21 02:55 PM
12/10/21 02:55 PM
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Joined: Jan 2003
Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,427
UPPER MICHIGAN, MARQUETTE COUN...
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A high pressure pump is only one with a stiffer spring. Again, it will have no impact on your idle oil pressure. The spring simply sets the max pressure that is allowed and then all the pressure after than to sent back to the pan along with it's volume.
Ok thanks.I'm going to try the 30w and see if I can get a bump in pressure up to 20+. Is this the same engine you had lifter problems with? If so what was the pressure before you went to the solid lifters?
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Re: Hemi Oil Pressure Range
[Re: NITROUSN]
#2994072
12/10/21 03:26 PM
12/10/21 03:26 PM
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Joined: Feb 2007
Posts: 217 New Port Richey, Florida
Wolfe440
OP
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New Port Richey, Florida
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A high pressure pump is only one with a stiffer spring. Again, it will have no impact on your idle oil pressure. The spring simply sets the max pressure that is allowed and then all the pressure after than to sent back to the pan along with it's volume.
Ok thanks.I'm going to try the 30w and see if I can get a bump in pressure up to 20+. Is this the same engine you had lifter problems with? If so what was the pressure before you went to the solid lifters? Good question and yes it is the same pressure at idle, I didn't see any noticeable change and I'm using same oil Lucas Hot Rod 10W-40. Lifters now sound a lot better as solid across the rpm range.
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Re: Hemi Oil Pressure Range
[Re: Wolfe440]
#2994089
12/10/21 04:07 PM
12/10/21 04:07 PM
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Joined: Jan 2003
Posts: 17,914 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,914
S.E. Michigan
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To increase hot pressure with increased oil viscosity, we would want the second number of a multigrade to go higher. The second number of a multigrade indicates higher temp (212F) viscosity. The first number relates to viscosity below freezing temperatures Single Grade (SAE30, 40 and so on) also indicates viscosity at 212F, but cold viscosity falls wherever it may. So....to experiment with a thicker viscosity when hot, if currently using 10w40, you would generally want to go to a __w50. 15w50 and 20w50 are pretty commonly available and that's what I'd recommend trying next if you wanted to do that experiment. 5w50s are available if you're concerned about cold weather performance. I've never seen 10w50 but am aware 10w60 is a common grade in some warm weather locations outside the US.
Rich H.
Esse Quam Videri
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Re: Hemi Oil Pressure Range
[Re: Wolfe440]
#2994090
12/10/21 04:18 PM
12/10/21 04:18 PM
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Joined: Jan 2003
Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,427
UPPER MICHIGAN, MARQUETTE COUN...
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A high pressure pump is only one with a stiffer spring. Again, it will have no impact on your idle oil pressure. The spring simply sets the max pressure that is allowed and then all the pressure after than to sent back to the pan along with it's volume.
Ok thanks.I'm going to try the 30w and see if I can get a bump in pressure up to 20+. Is this the same engine you had lifter problems with? If so what was the pressure before you went to the solid lifters? Good question and yes it is the same pressure at idle, I didn't see any noticeable change and I'm using same oil Lucas Hot Rod 10W-40. Lifters now sound a lot better as solid across the rpm range. Before I would waste a dime make sure that gauge is 100 percent correct. I would try another one just to be sure. Or you might be able to test it with air pressure along with a regulator and gauge. You would be pretty upset if you found it 5psi or more incorrect.
Last edited by NITROUSN; 12/10/21 04:19 PM.
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Re: Hemi Oil Pressure Range
[Re: Wolfe440]
#2994092
12/10/21 04:26 PM
12/10/21 04:26 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Being recently rebuilt, would it have had a new Melling M-63 oil pump installed? If so remove the "new standard" pink spring and replace it with the older BB oil pump original standard black spring. The last 3 that I have done idle at 25-28 psi hot. If that does not work then you probably do have increased bearing clearance, which is totally understandable for a Hemi.
HTH Randy Looks like a new Melling, and that is what I did, I took out the pink spring and installed black one one from a older pump which seemed to increase the top end pressure a bit, and the speed of increase but idle pressure stayed about the same. I will try a straight 30w and see if it can give me above 20ps, I can live with that. Not high volume but changing to a high pressure pump...would that bring up the idle pressure? i wouldn't chase high pressure by itself. large rotor pump has more displacement which should get you to relief pressure sooner. do the 30wt and look for a filter that is 95% efficient rather than 99%, and don't get lost in the brand name; this is just an economical test. i like the black springs for higher pressure but don't think anybody makes them anymore.
Last edited by lewtot184; 12/10/21 04:26 PM.
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Re: Hemi Oil Pressure Range
[Re: Wolfe440]
#2994112
12/10/21 05:18 PM
12/10/21 05:18 PM
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Joined: Jan 2003
Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,427
UPPER MICHIGAN, MARQUETTE COUN...
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Good suggestion trying a second gauge to insure accuracy, and I do have a second gauge and worth giving it a try. Its bran new in the box, just have to find it.... Main reason is I have seen many people here as well as other sites chase a problem only to find out it was a gauge accuracy issue. About the simplest and cheapest repair/test at this point. If the pressure is the same I would remove the pump and measure everything or just buy a new pump as they are cheap and easy to swap out. Heavier oil is just a band aid in my opinion.
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Re: Hemi Oil Pressure Range
[Re: NITROUSN]
#2994651
12/12/21 02:59 PM
12/12/21 02:59 PM
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Joined: Feb 2007
Posts: 217 New Port Richey, Florida
Wolfe440
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OP
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Posts: 217
New Port Richey, Florida
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Good suggestion trying a second gauge to insure accuracy, and I do have a second gauge and worth giving it a try. Its bran new in the box, just have to find it.... Main reason is I have seen many people here as well as other sites chase a problem only to find out it was a gauge accuracy issue. About the simplest and cheapest repair/test at this point. If the pressure is the same I would remove the pump and measure everything or just buy a new pump as they are cheap and easy to swap out. Heavier oil is just a band aid in my opinion. I got a new gauge, its showing 30lbs at idle and its hitting almost 70lbs by 2000rpm. Silly me, trusting an old test gauge, I won't make that mistake again. Got a lot of good info from this thread, thank you all for the help! Wolf
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Re: Hemi Oil Pressure Range
[Re: Wolfe440]
#2994792
12/12/21 10:50 PM
12/12/21 10:50 PM
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Joined: Jan 2003
Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,427
UPPER MICHIGAN, MARQUETTE COUN...
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Good suggestion trying a second gauge to insure accuracy, and I do have a second gauge and worth giving it a try. Its bran new in the box, just have to find it.... Main reason is I have seen many people here as well as other sites chase a problem only to find out it was a gauge accuracy issue. About the simplest and cheapest repair/test at this point. If the pressure is the same I would remove the pump and measure everything or just buy a new pump as they are cheap and easy to swap out. Heavier oil is just a band aid in my opinion. I got a new gauge, its showing 30lbs at idle and its hitting almost 70lbs by 2000rpm. Silly me, trusting an old test gauge, I won't make that mistake again. Got a lot of good info from this thread, thank you all for the help! Wolf Wow that's good to hear. Almost unbelievable. To many times we are like horses with blinders on. Glad it worked out. I know I would be as happy as a Clam..
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Re: Hemi Oil Pressure Range
[Re: lewtot184]
#2994925
12/13/21 02:24 PM
12/13/21 02:24 PM
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Joined: Sep 2003
Posts: 19,633 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,633
north of coder
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i think i would try a third gauge if one were available. now with that said, a hemi is an expensive piece of iron, so i would want to be absolutely, positively certain i could trust any information a specific gauge was telling me. in a perfect world, an expensive gauge "would" be better than a cheapo version, but our world isn't exactly perfect by any stretch of the imagination. figure this response another imperfect answer.
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