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#1
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High Pressure of High Volume oil pump?
Ok engine set up is a 440
.30+ Ross Nitrous Pistons Eagle H-beams Rods Edelbrock Performer RPM heads Hughes Roller tipped adjustable rocker arms Mechincal Mopar performance Pushrods Cam+Tappets undecided/ don't have yet, probably roller with a streetable cam Nitrous is planned on being used Should I go with a High pressure or High Volume oil pump, high volume correct? |
#2
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Which pump?
I would go with the high volume. The volume will assure lubrication while the high pressure demands more power to open the spring. I'm sure there is much more to this but this is the simplistic view.
Just thinking out loud again. |
#3
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high volume Oil pump
It's probably better to go with a new oil pump. but the difference between a high volume and a regular oil pump is a $3.00 spring. I found this out after buying a new unit of course. You can buy a regular oil pump and get the spring from the mopar performance catalog. my pump runs at 70 psi. Hope this helps.
Go With The Flow |
#4
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With all due respect,
The high pressure is just a spring. The high volume has larger pump rotors.
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#5
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ok...do what i did with my 340...
get a high volume pump, and put a high psi spring in it! after i installed the new spring, the psi on startup went from about 65, to 110! this was also with messed up bearings, and straight 50W oil..... we're going to use probably straight 30W, or 20W-50 again cause of the high psi...don't wanna blow my oil filter off.... my dad has done that before in his sprint car motor, but he was using straight 90W oil... |
#6
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As engine RPMs increase, oil volume requirements increase as well. This coupled with passage losses requires more volume.
I would not use the high volume unless you plan to run 7000+RPM. All you are going to do at lower RPM is continually bypass the oil in the pump and build up heat. I assume your bearing and lifter bore clearances are OK. The same with a high pressure pump, why do you want more than 10 lbs. of pressure per 1000 RPM? Any more than that and you just overstress your bearings and cause premature wear. I'm a racer not a street guy but if it were me I would clean up the passages and use a GOOD standard rotor pump and adjust pressure with springs/shims. |
#7
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TwiZtiD440, please fix your email address!
All your mail is bouncing!
__________________
Chairman of the "Board" - MoparChat.com The place that MOPAR enthusiasts call home! |
#8
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OK, So.........
SO my 360 idles with 10-15psi (800RPM) this is ok???
I was thinking it was way to low. 1972 roadrunner; !ARE YOU NUTS!?!?!?!?! Straight 30W with HV pump AND a high press spring?!?!?!?!? you will blow your filters apart! I have seen it happen with my own two eyes. Its catastrophic! and dont ever run 90W in an engine. it would take 50HP to turn the pump. |
#9
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Yeah, I'm from the old school too. 10-15PSI sounds too low. But is probably OK-But I would prefer 20-25 PSI when the oil is hot.
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#10
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Re: OK, So.........
Quote:
hey, i ALREADY have straight 50W in the drain pan...thats what i HAVE BEEN running.... we figured strait 30 would be easier on it..... course, we might not decide to run straight 30, but 20W-50 instead... and to answer your question................umm.................no, i don't THINK i'm....crazy......but then again i did paint my riding lawn mower like my car, call it the LawnRunner and put 400cc letters on the side (like my 340 on the front fender...) |
#11
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I have the Melling High Volume pump from Summit Racing, only $43. It will pump 70+ PSI with a hot running engine.
I put some 15w-50 Castrol synthic oil in it and it pumps near 90 PSI cold! I think I'll go back to a 10w-40 or thinner oil. The Oil pan/pickup is the Milodon 7qt low profile pan with 1/2" pickup. I have been doing allot of 7,000 RPM chassis Dyno pulls with the engine, and racing it too (shifting around 6,400 RPM), and also putting allot of street miles on the car and so far I have had no oiling problems. |
#12
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All currently available high volume pumps come with the high pressure spring.
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#13
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My opinion is, that the power requirement to turn a high volume pump is meaningless on a street engine, considering the insurance it gives you. Race car only would be different.
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#14
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I agree with Doug Wilson. fancy names and ideas don't matter as much as good engineering. |
#15
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oil pressure
Oil pressure as a general rule 10 lbs for every 1000 rpm.
This has been the standard for many years. It is a good bench mark to go by. However it was not indended to be aplyed to idle. this was for higher rpm operation. If you have oil pressure of less then 20psi at idle then change to a heavier oil. If this does not raise you pressure above 19 psi you better get your wrenches in a row. |
#16
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Oil pressure is one thing and volume another...
Usually we drill out the 3/8 oil pickup and tap out to 1/2 oil pickup from a hemi. Next we used the high volume mopar pump and spring, oil pressure is usually steady @ 80 lBs w 10/40.. |
#17
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Oil pressure/volume depends on engine use and design. My 383 runs big clearances (no street use) and I use a high volume pump. This pump with the clearances I have gives me 80 PSI @ 7400 RPM and 35-40 @ idle (1500 RPM) with 20-50 oil.
A common mistake is too much pressure. This creates excessive oil spraying around in the motor (windage), robs power to drive the pump (I read somewhere that a stock oil pump in a small block Chevy consumes 45 HP at average highway speed), and can shorten the life span of your engine. If you contact Melling or any other oil pump builders, they will reccomend a pump, but they are going to ask you the intended application and what your design bearing clearances are. Give them the info and you will get the right part the first time. Hope this helps a little. |
#18
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One problem if you get a high volume pump is getting the oil back to the pan. Has your lifter valley been smoothed or painted to help the flow back to the pan? And don't forget your windage tray!! Oil pressure is not as important as flow.
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