Oil pressure is crazy high!

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Chained_360 said:
Huh. That's interesting. I didn't mean to challenge your oil choice, it just didn't make sense to me. If it works, and especially if an experienced engine builder advised it, then I wouldn't listen to some stranger on the internet :)

(Hell, I wouldn't listen to me period)
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I am an amateur myself so I don't know if he is right or wrong. That is the nice thing about this website, lots of different opinions and facts. No worries about challenging my oil choice. I am always interested in hearing someone else's logic.
 
brian6pac said:
Get rid of the filter and run a fram HP-1, don't believe me call fram tech on monday
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I was told by a friend that was a Chrysler service tech that fram filters don't have a check valve in them so the oil will bleed down out of the oiling system and causes dry starts. Is there any truth to this or is it just myth?
 
The dyno operator said that the faulty oil pump cost me around 20hp because the motor was fighting to turn the pump with such high pressure. Is he correct? Anyone with any experiences like this?
 
As far as filters go Fram hp-1 has a check valve and the pressure relief valve is set at 22psi differential, standard fram ph-8 is set at 12 psi, HP-1 has a less micron filter to pass the heaver oil at higher pressure, like I said every company has a tech line you can call and ask questions.
 
My 340 had readings of nearly 100 cold, and almost 50 hot with 10w30. This for the first years of running. This was with a Mellings HV pump and using a Stewart Warner gauge (one of the less expensive ones.) About two years back I changed to an Autometer gauge and readings since have been closer to 50 cold and about 20 warm, less at hot idle.

Definitely a huge change in readings when I swapped the gauge!!!
 
nm9stheham said:
With the big drop between the HV and STD pumps, then the problem is likely in the pump being wrong (HP as suggested) or the relief valve was stuck in the HV, or the wrong spring was installed or the piston was installed backwards. The 2 types should make the same pressure when revved on the same oil; they only are different at lower RPM's.
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Finally some one mentioned the spring and valve ! use mopar filters and no problems on that end. Sounds like the wrong spring to me !
 
yellow rose said:
I have tested and there isn't 5 HP between a HV and a standard pump.

Again, who says what is standard and what is high volume? I've lost power with a standard volume pump. Lower engine speeds it didn't have enough volume to feed the rockers and they grabbed the shaft.

There is way more power to be had in controlling windage than there ever will be in oil pressure or volume.
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And I did some rough calculations and came out with a difference in the 1 HP range or so at higher RPM's. The rotor height difference is only 20%... and the turning torque/power is proportional to the rotor height. So if you reached an RPM where there was a true 5 HP difference in HV versus STD in the SBM pumps, then that would occur at an RPM when the STD was using up about 25 HP and the HV would use up about 30 HP.... which is all nonsense. Unless something is going on with the bypass function that changes all that....but both will be bypassing at higher RPM's.
 
Budgetmoparman said:
2 different gauges and same thing. Using napa gold filter.
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Probably why it didn't blow open with 140 psi....that is a LOT in this system! I've had a filter base seal blow out with less. BTW the pressure sensor port is AFTER the filter, so a filter media or media collapse problem would only drop the pressure, not raise it.
 
Here are the numbers. I wasn't going to share them originally because I am not impressed but maybe I can walk away with some insight for next time. There are a couple things that were against me on the dyno- first off the oil pump issue didn't help. Second, the thick oil itself probably didn't help any. Third, I have been told by a couple people that this dyno is not (user friendly) meaning that it always puts out lower numbers than other dynos around the area. I realize it is just a number and the real proof will come when it hits the streets this summer.

image.jpeg
 
the numbers arent bad. the most important thing to me about a dyno is knowing how the engine runs and fixing any issues that you find now. maybe that dyno is just a more realistic number. i have heard of people messing with the numbers to get more business. no proof though. im sure once its in the car you will forget all about the numbers ;) but that oil psi would worry me to
 
What are your clearences- rod,main,rod side clearence?
 
Dana said:
What are your clearences- rod,main,rod side clearence?
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I don't remember exactly. I have slowly been putting the motor together over the past summer. I did check with plastigauge and it was within specs. If I remember correctly it was on the tight side.
 
Factory specs are tight to begin with IMO. One way to add pressure is to restrict flow. The engine with its original specs was meant to operate on 1O/30 at best in your region. Now I,m not going to get into oil viscocity being measured differently between types and manufacturers. Now you are forcing a "thicker oil" through a clearance designed for 10/30 summer time.
 
Dana said:
Factory specs are tight to begin with IMO. One way to add pressure is to restrict flow. The engine with its original specs was meant to operate on 1O/30 at best in your region. Now I,m not going to get into oil viscocity being measured differently between types and manufacturers. Now you are forcing a "thicker oil" through a clearance designed for 10/30 summer time.
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I hear what you are saying. When I changed the oil pump I put 10/30 back in it.
 
It seems like, hang on a second........:soapbox: OK. It seems like the hv pump is considered a no brainer on any rebuild! Could someone please explain? Folks are buying HV before disassembly??? I have seen no reason to question chrysler engineers, and oil has only gotten better. A buddy of mine is building a 56 belair right now. He asked me the other day: What hv pump should i get? To which i said: Are you running a stock pan? YES How high are you gonna buzz it? 5500-6000. What are your oil clearances? DON'T KNOW. What oil are you gonna run? NOT SURE, i was thinking about blah,blah,blah. Talk about monkey see monkey do! I don't know about BB chevies, maybe they have some kind of oiling issue from the factory. Then he'll be whining because he can't keep the damn thing sealed up! I'll get down off the box now. I just thought it was all about demand and supply.
 
^^^^^^^^^^^^^^^^^^^^^^^

The faulty pump was replaced the oil used is fine the current pressures are fine! Move on to to some seat time and smile!!
 
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