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Abscate
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Joined: October 05, 2014
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Location: NYC/Upstate/ROW
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 Posted: Thu Apr 15, 2021 1:46 am Post subject: Re: Too Much Oil Pressure!! |
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My Dad was the structural dynamics guru in aerospace for decades. I went with him an strip once as a young kid, back when kids were allowed into classified areas.  He got called into a vibration problem once on a “ large structure’ drive 200 miles, listened to it vibrate, then said he was going for lunch.
“While I’m at lunch, you eight guys sort out which one has the uncalibrated tool.”
It was running smoothly when we came back.
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MarkWard
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Joined: February 09, 2005
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Location: Retired South Florida
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| Posted: Wed Apr 14, 2021 9:05 am Post subject: Re: Too Much Oil Pressure!! |
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Its not unheard of to add a ground wire to the sender body with a hose clamp to secure it to the sender.
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valvecovergasket
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Joined: October 10, 2018
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Location: pnw
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| Posted: Wed Apr 14, 2021 9:03 am Post subject: Re: Too Much Oil Pressure!! |
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| djkeev wrote: |
I wonder if the SunPro sender was giving false readings without having a good ground?
For a test I'm going to wire the SunPro gauge to the JEGS sender. Just curious about the non mechanical senders.
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yeah was just going to comment that you might want to ensure that all the gauges are powered off the same source - or at least getting roughly similar input voltage stuff at the dash can be pretty variable unless youve confirmed theyre close - and grounded properly, including the senders.
is the sender range the same on the sunpro?
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Last edited by valvecovergasket on Wed Apr 14, 2021 9:15 am; edited 1 time in total |
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djkeev
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Joined: September 30, 2007
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djkeev
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MarkWard
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Joined: February 09, 2005
Posts: 17155
Location: Retired South Florida
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| Posted: Tue Apr 13, 2021 4:00 pm Post subject: Re: Too Much Oil Pressure!! |
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I’ve had good service from Autometer gauges in my race car. The actual value is not so important. It’s repeatability and the ability to show a sudden loss of pressure.
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DanHoug
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| Posted: Tue Apr 13, 2021 3:58 pm Post subject: Re: Too Much Oil Pressure!! |
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nothing worse than 3 variate data points. bottom line is your OP is fine and now you just need to watch trends.
of course, i'll be cruising around with my accurate vintage VDO sender and matched gauge, both made in Germany, while you don't know which end is up. <evil grin>
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-dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
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djkeev
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Joined: September 30, 2007
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Location: Reading Pennsylvania
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| Posted: Tue Apr 13, 2021 3:36 pm Post subject: Re: Too Much Oil Pressure!! |
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It was a BEAUTIFUL day in the neighborhood!
I crawled under and pulled a plug on my GlowShift plate and screwed in my mechanical gauge.
Now I have a third set of numbers!
At idle the JEGS gauge is reading about 12psi higher than my mechanical gauge.
At higher RPM's, about 3,000 the JEGS gauge difference is much small, 6-7 psi higher than the mechanical gauge.
None the less, I have adequate oil pressure even if I subtract 15 off of every number!
But, is the mechanical gauge correct!?
Who knows...... three gauges, three different numbers all of which say I have good oil pressure.
A little knowledge is a dangerous thing!
I'll be contacting JEGS and see what they have to say.
When I removed the mechanical gauge I screwed a temperature sender into the outlet.
I'll be able to see what my oil temperatures are.
Dave
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djkeev
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Wildthings
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| Posted: Sun Apr 11, 2021 11:17 am Post subject: Re: Too Much Oil Pressure!! |
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| djkeev wrote: |
Went fir another ride, the pressures are still high, really no difference between the 19w and 15w oils.
Looking at oil weight vs temperature charts, at my mean temperatures in the 40’s and 50’s there really shouldn't be a difference.
The lower numbers really come into play when it gets COLD outside!
In theory, (as I understand it) any multi weight should have the same viscosity at a given temperature above their low range.
Be it 0w, 5w, 10w or 15w ..... at 50° they should all be the same viscosity.
Dave |
The low numbers followed by the "W" are the cold cranking and cold pumping specificataions of the oil, for a 0W oil they are in the -40°C range IIRC. They are not the same as rating a straight weight oil at 40°C or 100°C.
Your internal temps on a hot engine aren't even close to 50°C or to 50°F for that matter and thus the 0w, 5w, 10w or 15w have little to no bearing on your hot oil pressure, as I said above it is the second number that affects hot oil pressure. VW specs an oil pressure of 29 psi at 80°C and 2000 rpm so should it would be less at 90 or 100°C and the same rpm. |
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djkeev
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Wildthings
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| Posted: Sat Apr 10, 2021 5:10 pm Post subject: Re: TOO MUCH OIL PRESSURE!! |
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| djkeev wrote: |
I do KNOW that 10w or 15w made little difference in the oil pressure.
I've changed the oil so much already, I just may pick up a jug of 0w and see how it reads.
Dave |
Lowering the first number will lower the cold oil pressure and lowering the second number will lower the hot oil pressure, though there is some grey area here.
As far as the effect up running too high an oil pressure, when the oil is going back to the pan through the relief valve the flow of oil to the bearings is reduced as is the cooling effect of the higher oil volume flowing through the bearings and being splashed around the crankcase. |
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djkeev
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AtlasShrugged
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| Posted: Sat Apr 10, 2021 4:31 pm Post subject: Re: TOO MUCH OIL PRESSURE!! |
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Find and use some Rotella 0w40, that should shave about 2 to 5 psi hot oil pressure
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Wildthings
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| Posted: Sat Apr 10, 2021 4:31 pm Post subject: Re: TOO MUCH OIL PRESSURE!! |
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For years with a factory new engine I ran 10w30 in the winter and 30wt during the summer. Never put a gauge on it though, but the oil light worked at expected. I later moved to running a 5w40 "diesel" oil, but over the last year many of these oils have dropped their rating for use with a gasoline engine.
Today on an engine with tight bearings I would be likely be running a synthetic 5w30 year around. |
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dhaavers
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| Posted: Sat Apr 10, 2021 4:20 pm Post subject: Re: TOO MUCH OIL PRESSURE!! |
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So...all these high readings are on the JEGS digital gauge...???
- Dave
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djkeev
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djkeev
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DanHoug
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| Posted: Fri Apr 09, 2021 2:46 pm Post subject: Re: TOO MUCH OIL PRESSURE!! |
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i run 15-40 Rotella T4 and my pressure is a tad higher <nyah, nyah> at speed but slightly lower at idle (around 20). what's your oil temp?
i also run an oil cooler which accounts for the higher at speed OP. you're totally fine, stop bragging <grin>.
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-dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
www.thefixitworkshop.com |
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valvecovergasket
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Joined: October 10, 2018
Posts: 1492
Location: pnw
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| Posted: Fri Apr 09, 2021 2:31 pm Post subject: Re: TOO MUCH OIL PRESSURE!! |
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| djkeev wrote: |
What harm (if any) will the unusually high oil pressure (if it is really high and not a false reading) do to the engine? |
my only experience is with losing a couple of oil pumps on the inline motors. youll know its too high when all of the oil comes out of the engine at the filter seal in about half a second.
(relief valve stuck closed)
otherwise i think youre in good shape.
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