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Is my oil pressure too high? #2746253
02/24/20 10:04 PM
02/24/20 10:04 PM
Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles Offline OP
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West Plains, MO
I'm seeing about 55 psi hot idle (1200 rpm) and 75-80 psi at speed. Another 10 psi cold.

Think I have a Melling 63 HV pump but out of town right now, so can't check the pump height.

Isky nodular iron rockers, no oil restrictor, 430# open spring pressure (mushroom cam) so I want plenty of oil upstairs and on the lobes.

Oil is 15W-50 Mobil 1 because it has the right amount of ZDDP without resorting to additives.
Should I run a lighter oil, change the relief spring, or just not worry about it? shruggy

Re: Is my oil pressure too high? [Re: DrCharles] #2746259
02/24/20 10:24 PM
02/24/20 10:24 PM
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Posts: 103
chicago il
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ides Offline
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too many variables,try 10 w 30 if its a big block

Re: Is my oil pressure too high? [Re: ides] #2746261
02/24/20 10:26 PM
02/24/20 10:26 PM
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usa
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lewtot184 Offline
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it's easy to play with pressure if you have doubts. I don't use that much pressure.

Re: Is my oil pressure too high? [Re: lewtot184] #2746262
02/24/20 10:31 PM
02/24/20 10:31 PM
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West Plains, MO
DrCharles Offline OP
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Originally Posted by lewtot184
it's easy to play with pressure if you have doubts. I don't use that much pressure.


no worries, I know how to change the pressure (as mentioned, bypass spring or lighter oil)... what I don't want to do is find out the hard way I lowered it too much! smile
It is a big block (451 low deck). Occasional blasts up into the high 6000's. Mostly cruising, 3000 or less.

Re: Is my oil pressure too high? [Re: DrCharles] #2746267
02/24/20 10:49 PM
02/24/20 10:49 PM
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Cincinnati, Ohio
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chargincharles Offline
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Cincinnati, Ohio
Rule of thumb is 10psi per 1000 rpm. So minimum would be 30psi cruising 60psi for your blasts to 6000 rpm.
Being a big block they tend to favor the mains over heads. Unless you modified the oil passages in the block I'd say your ok. Better too much than too little.

Just my pennies...
CC.

Re: Is my oil pressure too high? [Re: DrCharles] #2746268
02/24/20 10:52 PM
02/24/20 10:52 PM
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Kirkland, Washington
Pacnorthcuda Offline
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I wouldn’t run 15w-50 unless the motor needed it, and yours most assuredly doesn’t.

Re: Is my oil pressure too high? [Re: Pacnorthcuda] #2746273
02/24/20 11:04 PM
02/24/20 11:04 PM
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West Plains, MO
DrCharles Offline OP
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It has 1200/1300 ppm of zinc and phosphorus, and a lot of oils (including the rest of the Mobil 1 lineup) do not.
In fact the Mobil application chart specifically recommends it for flat tappet applications... shruggy

I could run a 10w-30 or 10w-40 with the right amount of ZDDP... looks like Valvoline VR-1 has it too.
The engine was broken in on regular oil + zinc additive, incidentally. Rings are seated, no burning oil.

How would you determine that an engine needed it? work

Re: Is my oil pressure too high? [Re: DrCharles] #2746276
02/24/20 11:11 PM
02/24/20 11:11 PM
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North Dakota
Azzkikrcuda Offline
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You could try Valvoline VR1 racing oil, they have 10W30. It has around 1200 ppm zinc from the oil samples I have done.


The only Carbs I care about are under the hood!
Re: Is my oil pressure too high? [Re: DrCharles] #2746283
02/24/20 11:29 PM
02/24/20 11:29 PM
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Usa
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Ran both my 472 and 451 with 75-80lbs anything off idle, 15w40 Brad Penn with an in unmodified HV63 and 3/8" pickup. 6900-7000k trap rpm without issue. Never ate a pushrod, a rocker, bearing, or ever ran the pan dry. I have an OE 440 in a street car, same setup.


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Re: Is my oil pressure too high? [Re: A39Coronet] #2746292
02/25/20 12:11 AM
02/25/20 12:11 AM
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Auburn WA
Dave_J Offline
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Running that pressure may not hurt anything except the Horsepower output. Oil pumps draw a lot of power and have been known to twist the oil pump drive shaft off.
I'd change to a 10W30 or so with the ZDDP levels


Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

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65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: Is my oil pressure too high? [Re: A39Coronet] #2746293
02/25/20 12:12 AM
02/25/20 12:12 AM
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Grand Prairie,Texas
stumpy Offline
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How new is the motor? Has it been broken it good yet.

Re: Is my oil pressure too high? [Re: DrCharles] #2746311
02/25/20 02:49 AM
02/25/20 02:49 AM
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Bend,OR USA
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Cab_Burge Offline
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I use to run straight non synthetic petroleum 5W20Wt Valvoline in my old pump gas Duster with no additives in that 518 C.I. solid roller cam pump gas motor, work good, lasted a long time up
On your deal with the solid flat lifters I would use Valvoline VR1 10x30 Wt. racing oil with no additional additives twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Is my oil pressure too high? [Re: Cab_Burge] #2746315
02/25/20 03:57 AM
02/25/20 03:57 AM
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Posts: 3,122
Auburn WA
Dave_J Offline
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Originally Posted by Cab_Burge
I use to run straight non synthetic petroleum 5W20Wt Valvoline in my old pump gas Duster with no additives in that 518 C.I. solid roller cam pump gas motor, work good, lasted a long time up
On your deal with the solid flat lifters I would use Valvoline VR1 10x30 Wt. racing oil with no additional additives twocents


The 410 stroker I'm building will be broken in using 10W30 but its a Magnumn Hyd roller block so no need for ZDDP. Then I will run 5W20 and have two used oil analysis's done. I am running a Melling 72HV with the cover plate replaced with a direct pickup in 1/2 id. Stock pickup shown for reference, will be removed and port plugged.

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Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: Is my oil pressure too high? [Re: DrCharles] #2746346
02/25/20 10:08 AM
02/25/20 10:08 AM
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Benton, IL.
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DaveRS23 Offline
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Another vote for the 10w30 VR1. I switched to that from the 20w50 in my Hemi with a FTS cam and my pressure is good. The 10# per 1,000RPM is a good target.


Master, again and still
Re: Is my oil pressure too high? [Re: DaveRS23] #2746392
02/25/20 12:36 PM
02/25/20 12:36 PM
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So. Burlington, Vt.
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fast68plymouth Offline
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I’m happy with 70-80psi at the top end with a BBM.

I wouldn’t change anything.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Is my oil pressure too high? [Re: Pacnorthcuda] #2746401
02/25/20 01:17 PM
02/25/20 01:17 PM
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Central Florida
larrymopar360 Offline
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Originally Posted by Pacnorthcuda
I wouldn’t run 15w-50 unless the motor needed it, and yours most assuredly doesn’t.
I think this sums it up.


Facts are stubborn things.
Re: Is my oil pressure too high? [Re: larrymopar360] #2746406
02/25/20 01:26 PM
02/25/20 01:26 PM
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Posts: 352
Stoney Creek, Ontario, Canada
76Beeper Offline
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Amsoil Z rod 10W-30 is specifically designed for flat tappet engines.

Re: Is my oil pressure too high? [Re: 76Beeper] #2746420
02/25/20 01:48 PM
02/25/20 01:48 PM
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Downtown Roebuck Ont
Twostick Offline
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Downtown Roebuck Ont
You could try Mobil1 Delvac 5w40. The last analysis I saw on Bobistheoilguy showed around 1100 ppm so you should be more than good for a flat tappet.

Kevin

Re: Is my oil pressure too high? [Re: Dave_J] #2746421
02/25/20 01:48 PM
02/25/20 01:48 PM
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Fulton County, PA
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CMcAllister Offline
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Originally Posted by Dave_J
I am running a Melling 72HV with the cover plate replaced with a direct pickup in 1/2 id. Stock pickup shown for reference, will be removed and port plugged.


Plenty of pressure and plenty heavy on the oil unless this thing is going to be run hard in summer heat. I assume the clearances are real big (>.003"). Get some good 10w30 with Zinc and see what you end up with.


If the results don't match the theory, change the theory.
Re: Is my oil pressure too high? [Re: CMcAllister] #2746549
02/25/20 09:42 PM
02/25/20 09:42 PM
Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles Offline OP
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West Plains, MO
I built the short block a long time ago and don't remember what clearances, but not race-big.
It does get pretty hot in southern MO summers...

Anyway I agree that oil's a bit heavier than I need. Will try 10w-30.
Thoughts on synthetic vs. mineral oils? popcorn

Two people now are really sure I don't need synthetic oil. Again, please tell me why not, and in your opinion what DOES need synthetic oil? shruggy

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