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Old 02-03-2019, 12:57 PM
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High Volume Oil Pump??

In another recent thread, one poster stated that if he were to replace his oil pump as part of a RMS replacement, that he'd replace it with a high volume Melling pump. What advantage might a high volume oil pump have for a stock motor? Is there any downside?

Since the size of the oil passages within the motor will remain constant, I'm thinking that the higher volume will create a higher pressure. The only place I can think of where the higher pressure from a high volume pump comes in contact with any seal is the RMS.
It's my thought that the higher pressure against a stock RMS could easily cause an oil leak there.

Does anyone have any experience with using a high volume oil pump in a 4.0 or 4.2 Jeep engine? Or, any other engine?

Good Luck, L.M.

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Old 02-03-2019, 01:04 PM   #2
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No experience other than in some drag cars but that's a whole other thread. To be honest though I can't see the advantage in a 4.0/4.2 unless you're running a turbo that needs the extra or maybe a passive/active pre-head filtration system. The factory pump on mine right now runs 80psi at WOT, 40psi at idle and somewhere in between the rest of the time. High volume simply means more pressure when the fluid hits the factory sized passages.

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Old 02-03-2019, 02:06 PM   #3
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No personal experience either.
Based on things I have read, like this link, a stock 4.0 oil pump is more than enough. My engine stays below 2,000rpm 99% of the time, so the 10 psi per 1000rpm perameter is like the hot dog down the hallway comparison.
https://www.enginebuildermag.com/201...ight-oil-pump/
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Old 02-03-2019, 03:55 PM   #4
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I dont mind blowing money on my jeep and i would have paid more for the high volume (and almost did). But when i started researching it, it seemed like there were only negatives to running one on a stock engine. Maybe if i had a turbo or something but i dont.... And you will have to clearance the oil pan to fit one from everything i have seen. To much work for negative gain (heating the oil up) so i passed on it.
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Old 02-03-2019, 04:22 PM   #5
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I've used HV in several rebuilds, all Fords. I did notice a slight increase in oil pressure in all applications, but not near what a high pressure pump will do. My thought back then was to get as much oil through the engine as possible.
When I rebuilt the 283 in my YJ I talked it over with the machinist that did the work. He also builds race motors and does some racing himself.
His suggestion, on a very near stock motor, was to stick with the standard oil pump, and not go high volume. He suggested that the HV pump needlessly puts more pressure on the pump drive system, and also robs power (though I would think that to be pretty minimal) for little gain.
I stayed with the std pump on his advise and run about 60 lbs. I have no regrets with staying stock.
Just something to think about.
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Old 02-03-2019, 04:39 PM   #6
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Originally Posted by 283 YJ View Post
I've used HV in several rebuilds, all Fords. I did notice a slight increase in oil pressure in all applications, but not near what a high pressure pump will do. My thought back then was to get as much oil through the engine as possible.
When I rebuilt the 283 in my YJ I talked it over with the machinist that did the work. He also builds race motors and does some racing himself.
His suggestion, on a very near stock motor, was to stick with the standard oil pump, and not go high volume. He suggested that the HV pump needlessly puts more pressure on the pump drive system, and also robs power (though I would think that to be pretty minimal) for little gain.
I stayed with the std pump on his advise and run about 60 lbs. I have no regrets with staying stock.
Just something to think about.

yeah thats another reason i didn't get the high volume i forgot about that one.
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Old 02-03-2019, 08:47 PM   #7
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Funny thing, I just bought a new oil pump Thursday as part of pan gasket, rear main seal and timing chain replacement. I kept debating back and forth on a HV pump or not. All the research and reading lead me to sticking with a standard pump of good quality. So I got a Melling.

My motor is running at the very minimum allowable oil pressure, around 13-15psi at warm idle and anything above 2k rpm around 25-30 psi reaching 40 psi at higher rpms. And it sounds like a Diesel. LOL. And that was the reason I was thinking of going with a HV pump.

Funny thing is that when I did a compression test last week it was pretty good, 150-125, highest to lowest. Doesn’t burn or use any oil. Runs pretty well and passed a smog check well within spec. But dam is it a noisy motor. I’ll check the bottom end and piston clearance when I have the pan off.
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Old 02-03-2019, 08:53 PM   #8
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Quote:
Originally Posted by vmxwinn View Post
Funny thing, I just bought a new oil pump Thursday as part of pan gasket, rear main seal and timing chain replacement. I kept debating back and forth on a HV pump or not. All the research and reading lead me to sticking with a standard pump of good quality. So I got a Melling.

My motor is running at the very minimum allowable oil pressure, around 13-15psi at warm idle and anything above 2k rpm around 25-30 psi reaching 40 psi at higher rpms. And it sounds like a Diesel. LOL.

Funny thing is that when I did a compression test last week it was pretty good, 150-125, highest to lowest. Doesn’t burn or use any oil. Runs pretty well and passed a smog check well within spec. But dam is it a noisy motor. I’ll check the bottom end and piston clearance when I have the pan off.

If you replace the pump you have to buy a new pickup tube/screen too. They are a press fit and can not be reused because you do not want it sucking air instead of oil. You are not supposed to twist them back and forth to install them either just tap it straight in.

I did not want to buy an expensive oil pump install tool so i made my own out of a piece of pipe welded to a split collar for less than $10.
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Old 02-03-2019, 11:11 PM   #9
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Quote:
Originally Posted by vmxwinn View Post
Funny thing, I just bought a new oil pump Thursday as part of pan gasket, rear main seal and timing chain replacement. I kept debating back and forth on a HV pump or not. All the research and reading lead me to sticking with a standard pump of good quality. So I got a Melling.

My motor is running at the very minimum allowable oil pressure, around 13-15psi at warm idle and anything above 2k rpm around 25-30 psi reaching 40 psi at higher rpms. And it sounds like a Diesel. LOL. And that was the reason I was thinking of going with a HV pump.

Funny thing is that when I did a compression test last week it was pretty good, 150-125, highest to lowest. Doesnt burn or use any oil. Runs pretty well and passed a smog check well within spec. But dam is it a noisy motor. Ill check the bottom end and piston clearance when I have the pan off.
Those specs would concern me. Really low pressure, likely a result of bearing wear. In most engines the last bearing the oil passes through is the cam bearings. If they're warn, you'll never get good pressure. And I say "most" engines, as that's what I've worked on, don't know about the Jeep.
In your circumstances, and assuming you're only looking for a short term solution, the HV pump might not be a bad idea - but only as a band-aid.
If you can, plasti-gauge a couple of bearings when you get the pan off and see what might be dealing with.
Good luck
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Old 02-03-2019, 11:35 PM   #10
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I like the heck out of LM so I'd never give him the LMGTFY link but I DID google it in hopes that someone else would have a great explanation n save me typos er I mean typing...

Are high volume oil pumps OK to run on the street?

.

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Old 02-03-2019, 11:41 PM   #11
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Yeah the oil pressure is concerning. We’ll see if I can plasti gauge the bearings or not. Since it runs well at 160k I want to limp it along as long as I can. Looking for a cheap 4.0 core that I can rebuild at my leasure.
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Old 02-04-2019, 12:03 AM   #12
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Quote:
Originally Posted by vmxwinn View Post
Yeah the oil pressure is concerning. Well see if I can plasti gauge the bearings or not. Since it runs well at 160k I want to limp it along as long as I can. Looking for a cheap 4.0 core that I can rebuild at my leasure.
Plasti gauging a couple of rod end bearing wouldn't be too difficult to do, and maybe that will tell you what you need to know. I think if I were in your shoes, and didn't want to get too deep into it yet, I'd consider the high volume. Don't even consider high pressure - that'll cause more problems than you'll want to deal with. Honestly, the four HV pumps I used in the past caused me no ill issues and might be your best bet.
Good luck.
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Old 02-06-2019, 08:02 PM   #13
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I had the high volume pump in my 4.2l. I had about 5psi at idle measured on an actual oil pressure checker and not relying on the guage. My bearing clearances checking with plastigauge were about .002 on the rod bearings and .0015 on the main bearings before I rebuilt it so the high volume oil pump helped keep my oil pressure okay until I rebuilt it. The 4.2l by nature is not a high revving motor so I never worried about oil pan cavitation and I never exceeded 60 psi even at high revs (about 4000 rpms). If you have at least 10-15 psi at idle (13psi at 600 rpms is minimum spec), I wouldn't consider one.

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