Your thoughts on my oil pressure with this weight oil
#2389866
10/19/17 03:41 PM
10/19/17 03:41 PM
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Joined: Jan 2003
Posts: 12,076 Benton, IL.
DaveRS23
OP
Special needs idiot
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OP
Special needs idiot
Joined: Jan 2003
Posts: 12,076
Benton, IL.
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540 Hemi in a mostly street car that sees occasional 7,000RPM passes at the local 1/8th. My hot oil pressure is high 20s at idle (900+/-) and maxes in the high 60s just after 3,000RPM. That is more pressure than I need, isn't it? Are most of you comfortable with 10+PSI at idle and 60PSI max? I have been running VR-1 20/50 for years now with no issues. But VR-1 is only available in 20/50 and 10/30. I am thinking about trying the 10/30 VR-1, but just want to make sure that I am not taking any undue risk doing it. I would appreciate your thoughts and opinions on this.
Master, again and still
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Re: Your thoughts on my oil pressure with this weight oil
[Re: DaveRS23]
#2389868
10/19/17 03:49 PM
10/19/17 03:49 PM
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Joined: May 2003
Posts: 96,661 On The Boat, On The Lake, Wa. ...
amxautox
Still Retired. Still Posting on Moparts. A Lot.
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Still Retired. Still Posting on Moparts. A Lot.
Joined: May 2003
Posts: 96,661
On The Boat, On The Lake, Wa. ...
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how many miles on the motor?
Tom
"Everyone should believe in something; I believe I'll go fishing."
-Henry David Thoreau
Men and fish are alike. They both get into trouble when they open their mouths
author unknown
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Re: Your thoughts on my oil pressure with this weight oil
[Re: Pacnorthcuda]
#2389919
10/19/17 05:44 PM
10/19/17 05:44 PM
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Joined: Jan 2003
Posts: 12,076 Benton, IL.
DaveRS23
OP
Special needs idiot
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OP
Special needs idiot
Joined: Jan 2003
Posts: 12,076
Benton, IL.
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Valid points on the cold weather thing. I don't start it below maybe 50* or so. And I have an Accusump that I prime with to help.
So far, it's about even between 'leave it alone' vs 'try the 10/30'.
I've heard two conflicting rumors about Hemi oiling; one is that you want a heavier oil to cushion between the crank and the heavy recip assembly. Although mine is lighter than stock being Barton pieces. The second is that a lighter weight oil flows more, particularly over the valve springs, thereby cooling them better.
I don't have any issue leaving well enough alone (meaning staying with the 20/50) if that is what is best for this engine. But if there were any real advantages to going a lighter weight, then I would certainly do that.
If there were a 15/40 VR-1, I would be comfortable trying that as it's not as drastic a step as going to 10/30.
Here's another question; the oil pressure tops at about 68lbs just past 3,000RPM. So doesn't that mean that any volume after that is just bypassed back to the pan?
Wouldn't a lighter weight oil that doesn't by-pass until higher PRM be flowing more?
Master, again and still
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Re: Your thoughts on my oil pressure with this weight oil
[Re: NANKET]
#2389973
10/19/17 07:23 PM
10/19/17 07:23 PM
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Joined: Jan 2003
Posts: 12,076 Benton, IL.
DaveRS23
OP
Special needs idiot
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OP
Special needs idiot
Joined: Jan 2003
Posts: 12,076
Benton, IL.
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What are your bearing clearances? Frankly, I don't remember. We checked the clearances and balance before assembly. They were good.
What does Barton recommend? He didn't want to get into oil since it always causes lengthy discussions.
How hot do you get this engine on the street? It is steady at 180*.
Do you hot lap it at the track? Occasionally
Your pressure does not seem too high like some with 80 psi.
I don't go along with the thick oil group.
Master, again and still
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Re: Your thoughts on my oil pressure with this weight oil
[Re: Cuda340]
#2390019
10/19/17 09:10 PM
10/19/17 09:10 PM
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Joined: Jan 2011
Posts: 15,859 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,859
Central Florida
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I was told you want to use 20-50 in the hemi's because the thicker oil will stay up in the top of the head longer to lubricate the intake rockers. I think the oil pressure you have is perfect. Me too!
Facts are stubborn things.
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Re: Your thoughts on my oil pressure with this weight oil
[Re: larrymopar360]
#2390033
10/19/17 09:39 PM
10/19/17 09:39 PM
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Joined: Jun 2009
Posts: 644 Minnesota
Barnstorm
mopar
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mopar
Joined: Jun 2009
Posts: 644
Minnesota
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10/30 Mobil 1. We use it in everything incuding SS Hemis
The little old lady from Pasadena is back!
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Re: Your thoughts on my oil pressure with this weight oil
[Re: DaveRS23]
#2390055
10/19/17 10:39 PM
10/19/17 10:39 PM
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Joined: Dec 2014
Posts: 5,813 ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,813
ohio
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For reference, I used to run 20-50 in myb383. Took forever for the pressure to come down enough that I felt comfortable driving.
Dropped to 10-30, better warm up, no difference in pressure.
Dropped to 5-30, Even better warm up and still no drop in hot pressure.
I've considered trying 0-20. It's just an oil change and if it doesn't work drain and refill.
I have a high volume pump and deep Moroso pan but only run 6 qts.
Angry white pureblood male
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Re: Your thoughts on my oil pressure with this weight oil
[Re: ruderunner]
#2390119
10/20/17 12:32 AM
10/20/17 12:32 AM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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I ran 5W20 WT standard non synthetic Valvoline that Wal Mart stocked in my old pump gas Duster, it would have right at 18 to 20 lbs at 850 RPM in gear with 180+ F oil temps., 30+ lbs at 1200 RPM and 65 lbs. above 3000 RPM with the same oil temps. That motor made 727 HP and 700 + Ft lbs. on pump Oregon 91 octane pump gas the last time I had it on a DTS engine dyno with that oil and oil temps. I would shift the motor at or a little above 7000 RPM with 65 lbs. pressure, no problems with the bearings or any other parts in that motor, solid roller cam with full time oiling to the Harland Sharp roller rockers with a .040 restrictor to each side 250 Lbs. pressure on the seats and 650 lbs. open pressures Lots of myths on oil and every other part found in our Hi Po motors, not every one agrees on any of them
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Your thoughts on my oil pressure with this weight oil
[Re: DaveRS23]
#2390163
10/20/17 02:14 AM
10/20/17 02:14 AM
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Joined: Sep 2015
Posts: 1,096 Australia
ozymaxwedge
super stock
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super stock
Joined: Sep 2015
Posts: 1,096
Australia
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I'd be happy with those numbers and I would stay with the 20/50 mineral , what could possibly be achieved buy going to a thinner oil. I always get heat into my engines before they get a beating.
1963 Plymouth Max Wedge 1971 Barracuda
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Re: Your thoughts on my oil pressure with this weight oil
[Re: ozymaxwedge]
#2390178
10/20/17 02:48 AM
10/20/17 02:48 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I would for sure try the thinner oil. I'd want the thinnest oil that maintains the psi I am OK with. I may be off base on this & I do not know Hemis but I don't think using a heavier oil cuz it stays up top later is valid, I'd want the thin oil continually flowing. Nascar goes with thinner oil for a reason.
live every 24 hour block of time like it's your last day on earth
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Re: Your thoughts on my oil pressure with this weight oil
[Re: ozymaxwedge]
#2390193
10/20/17 05:09 AM
10/20/17 05:09 AM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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what could possibly be achieved buy going to a thinner oil. I always get heat into my engines before they get a beating. I switch from straight 30wt oil to 5W20Wt oil do to seeing right at 8HP gain running the oil temps on the engine dyno testing from 130 F to 160 F I then tried 10W30WT and saw 3 HP difference going from 130 F to 170 F. The next engine I tested was with 5W20WT and I saw no differences in HP going from 80F to 200 F oil temps on a roller cam bracket race motor Oil does two things in our motors, it lubricates and cools the parts it touches The sooner it is lubricating it is also cooling resulting in less wear and tear on our parts
Last edited by Cab_Burge; 10/20/17 05:10 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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