Re: Mopar Street Big Block Oil Pressure
[Re: AndyF]
#2094726
06/20/16 12:32 AM
06/20/16 12:32 AM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
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Posts: 43,127
Bend,OR USA
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You could put the HV pump in there to see what it does. That is a fairly simple experiment to run. Sometimes the best solution is a HV pump with a standard spring, other times you need the black spring. Way better to have to much volume and pressure than needed I would install the high volume pump as is but inspect and clean it before use, and then see what pressures you end up with I normally use that pump on all my Hi Po BB builds, I will trim some coils off the black spring if needed, IE a street and strip motor that will see 6500 RPM max I will shoot for 65 lbs at 6500 RPM with hot oil(160F+) on the dyno or in the car On your deal if you decide to reduce the pressure on the high volume pump do as AndyF suggested, remove the black spring and put in the other spring from the standard pump to see what that does for you I have added shims(thin flat washers that will fit in the bypass valve cup between the srping and cup) to a standard pump to icrease the bypass pressure. Let us know what you decide and find out, it will help others on here
Last edited by Cab_Burge; 06/20/16 12:34 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2094770
06/20/16 01:39 AM
06/20/16 01:39 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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Can I run the standard MP oil pump distributor gear with the HV pump? Do I need to pull the distributor and oil pump gear to replace the pump. Or can I just pull the oil pump? (1) I believe so but wait for the BB guys to chime in. (2) I would have the pump bolts barely snug then insert the intergear then final torque the pump bolts for dead on hex alignment. I want to ask what weight of oil are you running? I would want the lightest weight you can get by with & still have adequate psi
live every 24 hour block of time like it's your last day on earth
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2094803
06/20/16 03:18 AM
06/20/16 03:18 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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Alright & I ain't enough of an oil guy to know if that is thin or thick oil (or somewhere in between)
live every 24 hour block of time like it's your last day on earth
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2094880
06/20/16 11:33 AM
06/20/16 11:33 AM
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Joined: Jan 2003
Posts: 12,028 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,028
Benton, IL.
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I run a stock drive on my HV pumps with no problems at all. And go ahead and try installing the new pump with the drive in place. Spin the pump back and forth as you slide it up into place so that the hex can align. If it fights you, you can always bump the engine over a bit to help align the hex.
Question; Does the HV pump have that much more resistance to turning than the std pump? It would seem that the pressure would impact the resistance more. At say 60# pressure, how much harder do you think it would be to spin an HV pump over a std pump?
Master, again and still
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Re: Mopar Street Big Block Oil Pressure
[Re: lewtot184]
#2094941
06/20/16 01:13 PM
06/20/16 01:13 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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me to for higher RPM/spirited driving I think adequate area on the suction side is important (1/2 pickup & a bit more mods upstream). I want adequate area (pressure side as well)/correct bearing clearances/correct (as light as possible) oil weight/bypasses as some journals can be starving tho the gauge at the beginning of the system (rear of the block) shows an adequate number) THEN see how much pump/spring I need to obtain enough psi
live every 24 hour block of time like it's your last day on earth
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095076
06/20/16 04:14 PM
06/20/16 04:14 PM
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Joined: Jan 2003
Posts: 30,998 Oregon
AndyF
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Oregon
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Hey RapidRobert, I am running 15w50 15w50 oil? That seems a bit overkill. I'd put some 10w30 in there and see where you're at. The thick oil is hard to pump so the engine doesn't get as much oil flow.
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Re: Mopar Street Big Block Oil Pressure
[Re: AndyF]
#2095086
06/20/16 04:37 PM
06/20/16 04:37 PM
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Joined: Nov 2007
Posts: 21,819 Kirkland, Washington
Pacnorthcuda
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Hey RapidRobert, I am running 15w50 15w50 oil? That seems a bit overkill. I'd put some 10w30 in there and see where you're at. The thick oil is hard to pump so the engine doesn't get as much oil flow. He'll have less pressure with 10w30. 10w30 and a HV pump might be the perfect combination though.
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Re: Mopar Street Big Block Oil Pressure
[Re: lewtot184]
#2095147
06/20/16 06:31 PM
06/20/16 06:31 PM
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Joined: Feb 2003
Posts: 16,133 Mesa, Arizona
dart4forte
I Live Here
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I Live Here
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Posts: 16,133
Mesa, Arizona
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Same issue. Stock melling pump with the heavier spring. Running 15/40 Idles at 20pds hot and cruises around 6o-70 hot
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095167
06/20/16 07:12 PM
06/20/16 07:12 PM
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Joined: Jan 2003
Posts: 74,978 U.S.S.A.
JohnRR
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You'll be fine with the 3/8 pick up.
If you insist on running the thicker oil then I would seriously consider upgrading to the HD oil pump drive ... i would do it no matter what oil ... it's cheaper than the cost of rebuilding the motor if the hex shears off.
running up my post count some more .
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095327
06/20/16 11:42 PM
06/20/16 11:42 PM
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Joined: Feb 2007
Posts: 749 NY
Beep Beep
OP
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OP
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095412
06/21/16 01:18 AM
06/21/16 01:18 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
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Balt. Md
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Re: Mopar Street Big Block Oil Pressure
[Re: lewtot184]
#2095469
06/21/16 07:16 AM
06/21/16 07:16 AM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
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West Plains, MO
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(i will never believe side clearance doesn't effect pressure. it's a hole, it's a leak!) You may believe it or not, but the laws of physics don't change for your beliefs You do realize that the oil "leaking" from those gaping side-clearances had to come from the oil passage in the journal, pass through the much smaller bearing clearance, then exit via the side clearance? It's a series circuit and the vast majority of the resistance (to fluid flow, just as with electricity) comes from the most restrictive part which is the bearing clearance...
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Re: Mopar Street Big Block Oil Pressure
[Re: 62maxwgn]
#2095504
06/21/16 09:47 AM
06/21/16 09:47 AM
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Joined: Jan 2003
Posts: 74,978 U.S.S.A.
JohnRR
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You'll be fine with the 3/8 pick up.
If you insist on running the thicker oil then I would seriously consider upgrading to the HD oil pump drive ... i would do it no matter what oil ... it's cheaper than the cost of rebuilding the motor if the hex shears off. John,if you knew what I have been running in my bird for 33 yrs you would be Bill you're crazier than me He asked for opinions and I gave mine to his situation and the small cost outweighs the cost of a full rebuild. 53psi at 6000 rpm is a little risky to me.
running up my post count some more .
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095506
06/21/16 09:49 AM
06/21/16 09:49 AM
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Joined: Jan 2003
Posts: 74,978 U.S.S.A.
JohnRR
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Thanks everyone for all the great feedback. I will try the HV pump with 10w40. I ran 10w40 with the current pump and yes the oil psi was even lower.
Does anyone know if the Mopar Performance Distributor gear is a good match these HV pumps. The MP catalog does mention that it's hardened, or should I just order the Milodon distributor gear? Any other distributor gears that you guys recommend with HV pumps? Pick your poison
running up my post count some more .
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Re: Mopar Street Big Block Oil Pressure
[Re: DrCharles]
#2095536
06/21/16 10:57 AM
06/21/16 10:57 AM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
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(i will never believe side clearance doesn't effect pressure. it's a hole, it's a leak!) You may believe it or not, but the laws of physics don't change for your beliefs You do realize that the oil "leaking" from those gaping side-clearances had to come from the oil passage in the journal, pass through the much smaller bearing clearance, then exit via the side clearance? It's a series circuit and the vast majority of the resistance (to fluid flow, just as with electricity) comes from the most restrictive part which is the bearing clearance... no disrespect, but i don't agree. my real world experiences say side clearance is a leak.
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Re: Mopar Street Big Block Oil Pressure
[Re: lewtot184]
#2095550
06/21/16 11:15 AM
06/21/16 11:15 AM
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Joined: Jan 2003
Posts: 74,978 U.S.S.A.
JohnRR
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(i will never believe side clearance doesn't effect pressure. it's a hole, it's a leak!) You may believe it or not, but the laws of physics don't change for your beliefs You do realize that the oil "leaking" from those gaping side-clearances had to come from the oil passage in the journal, pass through the much smaller bearing clearance, then exit via the side clearance? It's a series circuit and the vast majority of the resistance (to fluid flow, just as with electricity) comes from the most restrictive part which is the bearing clearance... no disrespect, but i don't agree. my real world experiences say side clearance is a leak. Side clearance is a clearance just like bearing clearance, the wider the gap ....
running up my post count some more .
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Re: Mopar Street Big Block Oil Pressure
[Re: JohnRR]
#2095570
06/21/16 11:52 AM
06/21/16 11:52 AM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
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West Plains, MO
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Side clearance is a clearance just like bearing clearance, the wider the gap .... Yes, and so is header clearance. Not the point. Please go back and read my post more carefully ... where does the oil (that's escaping from those side clearances) come from? That's right, it's already been through the tightest restriction, the bearing clearance. It is NOT an "independent" leak stealing oil directly from the pressurized galleries and dripping it back to the pan! So the effect of a wide side clearance is very small (if not absolutely negligible) compared to bearing clearance. As many guys who have put Chevy-width rods on Mopar-width cranks have discovered, with plenty of oil pressure. Meanwhile, go on believing as you please. No point in trying to teach something to people who already "know".
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Re: Mopar Street Big Block Oil Pressure
[Re: lewtot184]
#2095573
06/21/16 11:57 AM
06/21/16 11:57 AM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
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master
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West Plains, MO
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no disrespect, but i don't agree. my real world experiences say side clearance is a leak. So you have some identical engines that differ solely in the rod side clearances, and the ones with tighter clearances have more oil pressure? NOTHING is different but that? Same operating temps, oil viscosity, brand, etc. etc. Please provide more info here... If I'm wrong, I'd love to know why other than just claiming "real world experiences". (The plural of "anecdote" is NOT "data"). Also no disrespect intended, of course, but I've met far too many people in my life who know things that just ain't so...
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Re: Mopar Street Big Block Oil Pressure
[Re: DrCharles]
#2095637
06/21/16 02:03 PM
06/21/16 02:03 PM
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Joined: Jan 2003
Posts: 5,137 East Aurora (Buffalo) NY
RoadRunner
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East Aurora (Buffalo) NY
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Side clearance is a clearance just like bearing clearance, the wider the gap .... Yes, and so is header clearance. Not the point. Please go back and read my post more carefully ... where does the oil (that's escaping from those side clearances) come from? That's right, it's already been through the tightest restriction, the bearing clearance. It is NOT an "independent" leak stealing oil directly from the pressurized galleries and dripping it back to the pan! So the effect of a wide side clearance is very small (if not absolutely negligible) compared to bearing clearance. As many guys who have put Chevy-width rods on Mopar-width cranks have discovered, with plenty of oil pressure. Meanwhile, go on believing as you please. No point in trying to teach something to people who already "know". Correct. The governing pressure drop is going to be the tightest (smallest area) flow in the system. Once the oil has squeezed through the bearing faces, it is basically open to the internal of the engine. If the side clearance was zero, there would be no flow but you may not necessarily see infinite pressure because of oil flowing through other parts of the engine (the next largest open areas). Once the side clearance is equal to the bearing clearance or greater, it no longer has a significant impact on pressure drop.
68 Road Runner (383/4speed, post car w/decor pkg) - Major Project 69 Road Runner w/472 Hemi & 4 speed. 70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project 2023 Ford Mach 1
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Re: Mopar Street Big Block Oil Pressure
[Re: AndyF]
#2095706
06/21/16 03:50 PM
06/21/16 03:50 PM
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Joined: Nov 2012
Posts: 53
Torq37
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Higher oil pressure from thicker oil isn't necessarily a good thing. The higher pressure just means that the oil isn't flowing thru the engine very well. The pressure rise is due to reduced oil flow which isn't necessarily a good thing. The bearings need some oil flow across them to carry away the heat so less flow could be bad.
60 psi with thick oil and a standard pump could be a lot less oil volume than 60 psi with thin oil and a HV pump. People tend to focus on oil pressure since almost everyone has an oil pressure gauge but oil flow is also important. By this logic (which I agree with) is 53 psi necessarily a bad thing? From my limited understanding of journal bearings, as long as there is enough oil present to support a hydrodynamic layer, the feed pressure isn't that critical. It's hard to picture a bearing being starved at 53 psi or for that matter 30 psi.
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Re: Mopar Street Big Block Oil Pressure
[Re: JohnRR]
#2095780
06/21/16 06:13 PM
06/21/16 06:13 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
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master
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Blair County,PA
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You'll be fine with the 3/8 pick up.
If you insist on running the thicker oil then I would seriously consider upgrading to the HD oil pump drive ... i would do it no matter what oil ... it's cheaper than the cost of rebuilding the motor if the hex shears off. John,if you knew what I have been running in my bird for 33 yrs you would be Bill you're crazier than me He asked for opinions and I gave mine to his situation and the small cost outweighs the cost of a full rebuild. 53psi at 6000 rpm is a little risky to me. Now you can point your finger and laugh,65 Race Hemi rods and main bearings,standard crank,from 20/50 Kendall GT1 in the early 80's to Brad Penn 20/50 now,65 psi at idle hot and roughly 75 + at 3K,never had a problem,thats how we did things 30 yrs ago.This is what it looked like after 30 yrs when I changed the intake gasket last year.
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095994
06/22/16 01:05 AM
06/22/16 01:05 AM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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I think NASCAR engines run 9000rpm @ 50 psi oil pressures.
Volume peeps, volume.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2096012
06/22/16 01:36 AM
06/22/16 01:36 AM
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Joined: Sep 2015
Posts: 1,096 Australia
ozymaxwedge
super stock
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super stock
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So I will be happy with my 20lb - 60lb hot
1963 Plymouth Max Wedge 1971 Barracuda
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Re: Mopar Street Big Block Oil Pressure
[Re: DARTH V8Я]
#2096188
06/22/16 12:46 PM
06/22/16 12:46 PM
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Joined: Jun 2015
Posts: 313 Northeast Indiana
73DAD
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Northeast Indiana
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I think NASCAR engines run 9000rpm @ 50 psi oil pressures.
Volume peeps, volume. Aren't they running that with a mere half thousandth of bearing clearance and oil as thin as water?
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2096260
06/22/16 03:08 PM
06/22/16 03:08 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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To the OP and everyone else who tried answering without thinking things through: 15psi at idle and 53psi at 00 rpm are very much in line with the old "10psi per thousand rpm" rule of thumb. Why change anything? Your question seems to be based in ignorance. The first responders should have gone there first. Another thing: bearing clearances. I didn't see any bearing clearances that were out of line with what's been suggested here lately.
If you must do anything, add a high volume pump, you can do that from the outside. No need to mess with the spring. No need to disassemble the engine and add a 1/2" pickup. Maybe that's worthwhile on Hemis running 7000rpm for hours, NASCAR 1960s style, but for a street engine it seems to be just another way to screw up a perfectly good block.
IF you have all the money in the world, eliminate the internal pickup and use an external pickup setup, but it is clearly not needed on an engine that just the way it sits has 53psi hot oil pressure at 5000 rpm.
I don't care what oil pump you run, I'd change the pump drive/distributor gear to one that doesn't have a sharp step between the shaft and the hex. That is a stress riser or concentrator. Just from the mechanical design alone it is wrong.
As to the other items that popped up, fluid dynamics is not intuitive. That's why I had to take it twice. The second time through it popped into focus. Then I spent 19 years designing pump systems.
R.
Last edited by dogdays; 06/22/16 03:08 PM.
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