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Heavy Duty or High Volume oil pump: which is "better"? #1394133 02/26/13 11:19 PM 02/26/13 11:19 PM
Joined: Jan 2013 Posts: 77 Louisiana R rnch OP member
rnch OP member R Joined: Jan 2013 Posts: 77 Louisiana	for my street driven '85 ram 150, 318 engine, torqueflite tranny? I'm looking for the most oil pressure I can have below 2500 rpm.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394134 02/27/13 03:24 AM 02/27/13 03:24 AM
Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif. B bigblock340power master
bigblock340power master B Joined: Aug 2004 Posts: 8,087 Elk Grove, Calif.	I've always used Melling high volume, high pressure pumps. I've used them in my 416 stroker, and in more subdued builds. Never disappointed me yet! Just my

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394135 02/27/13 03:30 AM 02/27/13 03:30 AM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	What kind of pressure #'s are you looking for ?...and WHY high pressure at lower rpms ?

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: dOc !] #1394136 02/27/13 08:08 AM 02/27/13 08:08 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	standard only pumps for me. Iv learned my lesson with hi volume/hi pressure pumps.. They are not needed.... I am truckless..

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394137 02/27/13 08:47 AM 02/27/13 08:47 AM
Joined: May 2003 Posts: 3,265 Pyeongtaek, South Korea 69HemiGTX master
69HemiGTX master Joined: May 2003 Posts: 3,265 Pyeongtaek, South Korea	High pressure and/or volume aren't really necessary for 2500 RPM. The factory pump is more than adequate. OIF V and OEF X veteran and proud of it!

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: 69HemiGTX] #1394138 02/27/13 10:35 AM 02/27/13 10:35 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	just replace it with a stock over the counter oil pump from napa. I have used a lot of the melling M72 pumps on new engine builds as well as high milage engines. if I use a HV/HP pump on a new build I drill the oil pump/main cap/block to 1/2" add 4 more holes in the oil filter adaptor, drill the feeds to lifter galleys to 9/32,matching/blending all mating surfaces and rounding any turns i can reach. other wize it uses a stock pump with stock engine specs.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: dOc !] #1394139 02/27/13 12:49 PM 02/27/13 12:49 PM
Joined: Jan 2013 Posts: 77 Louisiana R rnch OP member
rnch OP member R Joined: Jan 2013 Posts: 77 Louisiana	Quote: What kind of pressure #'s are you looking for ?...and WHY high pressure at lower rpms ? I recently bought a higher mileage 318 powered ram, looks like oil hasn't been changed in a L O N G time due to a rounded off, stuck oil pan drain filler plug. The oil pressure gauge still reads slightly below half scale all the time, no engine noise that I would associate with low oil pressure. I'm going to be swapping oil pans soon, thought it might be a good prevenative measure to change the pump out with the pan off? Perhaps I will just clean the pick up screen and let it go.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394140 02/27/13 01:09 PM 02/27/13 01:09 PM
Joined: Aug 2006 Posts: 8,064 Iowa 76dodgeboy master
76dodgeboy master Joined: Aug 2006 Posts: 8,064 Iowa	Wouldnt hurt to put a new pump in if you have the pan off. Oil pump and timing chain always get changed if I have that area open enough to do so

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: 69HemiGTX] #1394141 02/27/13 02:12 PM 02/27/13 02:12 PM
Joined: Jan 2013 Posts: 77 Louisiana R rnch OP member
rnch OP member R Joined: Jan 2013 Posts: 77 Louisiana	Quote: High pressure and/or volume aren't really necessary for 2500 RPM. The factory pump is more than adequate. Good to know! This truck ('85 ram 150, 318 & torqueflite) will be my back up vehicle; used mainly for trips to home depot or lowes to get stuff that I feel guilty about putting in the carpeted trunk of my new car; will seldom experience more than 65 mph on the occassional interstate run to work....slowly trying to fix what the previous owner deferred doing.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394142 02/27/13 02:17 PM 02/27/13 02:17 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	A stock pump is the best for your application. Yes, this advice has changed from years ago. The horsepower that it takes to drive the pump varies DIRECTLY with either flow or pressure. Increase both and it varies by the product of the two. Having 50psi at idle for example, just twists your camshaft and puts more load on the oil pump drive. R.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394143 02/27/13 09:38 PM 02/27/13 09:38 PM
Joined: Dec 2007 Posts: 1,357 central Florida VL21 pro stock
VL21 pro stock Joined: Dec 2007 Posts: 1,357 central Florida	Quote: The oil pressure gauge still reads slightly below half scale all the time Don't go by the gauge, it just serves in an advisory capacity. Merely something to give you something to look at. My '85 is VERY slow to start any reading, even with a new sender unit to replace the leaker. And I think there is also a light? Seem to remember one ... It is probably about as accurate as the temp gauge. 7606069-7465539-001.JPG (17 downloads) It takes gasoline to interest me.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: VL21] #1394144 03/01/13 01:01 AM 03/01/13 01:01 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	The high pressure pump has a stiffer release spring. At low RPM if you are dealing with low OP that won't help. The relief valve is already closed. The high volume pump will move more oil at low RPM and may help oil pressure. The only application I can think of where a high pressure/std volume pump may help is a super high RPM race engine (>7,000 RPM). Otherwise the HV/std pressure may help a low OP situation at low RPM... and as many have posted the std volume/std pressure setup is usually fine with a stock or near stock engine.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: 340SHORTY] #1394145 03/01/13 11:37 AM 03/01/13 11:37 AM
Joined: Mar 2007 Posts: 9,336 South-Central (Sebring), FL Commando1 master
Commando1 master Joined: Mar 2007 Posts: 9,336 South-Central (Sebring), FL	Quote: standard only pumps for me. Iv learned my lesson with hi volume/hi pressure pumps.. They are not needed.... You nailed it!!!

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394146 03/01/13 07:25 PM 03/01/13 07:25 PM
Joined: Jan 2003 Posts: 859 VA A AtomicDog super stock
AtomicDog super stock A Joined: Jan 2003 Posts: 859 VA	I use the high volume Melling oil pump in my small block motors, along with the Mopar Performance oil pump drive, which has a hardened tip and the shaft pinned to the gear. Also, usually used with a deep oil pan and windage tray, too. Works great for my needs.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394147 03/19/13 09:40 PM 03/19/13 09:40 PM
Joined: Jan 2013 Posts: 77 Louisiana R rnch OP member
rnch OP member R Joined: Jan 2013 Posts: 77 Louisiana	Quote: Quote: High pressure and/or volume aren't really necessary for 2500 RPM. The factory pump is more than adequate. Good to know! This truck ('85 ram 150, 318 & torqueflite) will be my back up vehicle; used mainly for trips to home depot or lowes to get stuff that I feel guilty about putting in the carpeted trunk of my new car; will seldom experience more than 65 mph on the occassional interstate run to work....slowly trying to fix what the previous owner deferred doing. I replaced the oil pump (and oil pan and gasket) this weekend with a standard pressure Melling oil pump. The oil pressure gauge reads somewhat higher, a bit more than half scale, but does build up pressure quicker than before.

Re: Heavy Duty or High Volume oil pump: which is "better"? [Re: rnch] #1394148 03/19/13 10:20 PM 03/19/13 10:20 PM
Joined: Dec 2010 Posts: 1,035 Missouri U.S.A. 7 71yelladustr super stock
71yelladustr super stock 7 Joined: Dec 2010 Posts: 1,035 Missouri U.S.A.	As mentioned before, Dont go off of the p.o.s. factory gauge in the dash for any precise oil pressure readings. They are generally way off. Put you a MECHANICAL gauge under the dash if you are that concerned about it. FWIW, mopars usually carry very good oil pressure, even at lower speeds with the STOCK pump. They ain't a SB chebby that can just barely muster 30 psi cold. 392 gen III hemi on E-85 727 trans Dana 60 10.02@134

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