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Oil Pressure #745788
March 01st 2019 1:32 am
March 01st 2019 1:32 am
Joined: Feb 2019
Posts: 79
Arkansas
Lister Offline OP
journeyman
Lister  Offline OP
journeyman
Joined: Feb 2019
Posts: 79
Arkansas
When I start my van, it sits almost at the max which on my gauge is 60. I think its starts around 55ish
I've noticed many gauges on G20s go to 80 but mines definitely 60

After a while it settles down a bit and hangs around 45ish. is this normal? I mean 60 isnt that much really, it just freaks me out to see any gauge near its limit


[Linked Image]
93 Chevy G20 Explorer
Re: Oil Pressure [Re: Lister] #745789
March 01st 2019 2:18 am
March 01st 2019 2:18 am
Joined: Jun 2010
Posts: 14,403
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,403
Van Diego California
Yes your oil's cold N doesnt flow well at 1st.


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Oil Pressure [Re: Lister] #745790
March 01st 2019 2:34 am
March 01st 2019 2:34 am
Joined: Apr 2010
Posts: 2,678
San Diego
W
wrcsixeight Offline
veteran
wrcsixeight  Offline
veteran
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Joined: Apr 2010
Posts: 2,678
San Diego
Cold oil will pretty much always hit the bypass limit of the oil pump, at any RPM

On my Dodge when cold the max oil pressure I will see is 68, and this is cold or 3k rpm.
When it is hot, the ma pressure lowers to 62PSI, but it takes much more rpm to reah this maximum.

Thicker oils will raise oil pressure when hot, at lower rpms, compared to a thinner oil.

A quick difference in oil pressure readings for the same general temperature and rpm might be related to a failed oil filter or perhaps the oil itself got diluted with fuel making it thinner, or several other less likely possibilities.

They say as long as you have more than 10PSI per 1K rpm that is enough

it is NOT oil pressure keepinng metal fro metal in the bearings, it is the oil film strength. Oil pressure is more an indication of the rate at which oil is being pumped through the engine, and more is not always better. If it was we should all run 80w-90 gear oil and have the oil pump in bypass the whole time at 60+ PSI.

The seting of the oil bypass can be changed with either high FLow or high PSI pumps. High flow pumps pump more oil per revolution, high PSI pumps might do that and also have a higher bypass rating, the high flow pump could have the stock oil pressure PSI rating, it just gets there at lower rpm.

Re: Oil Pressure [Re: Lister] #745799
March 01st 2019 12:05 pm
March 01st 2019 12:05 pm
Joined: Feb 2019
Posts: 79
Arkansas
Lister Offline OP
journeyman
Lister  Offline OP
journeyman
Joined: Feb 2019
Posts: 79
Arkansas
Very interesting, good info thanks

tis strange my gauge only goes to 60 when I see others go to 80

I'll do an oil change at the weekend and see what happens


[Linked Image]
93 Chevy G20 Explorer
Re: Oil Pressure [Re: Lister] #745801
March 01st 2019 12:41 pm
March 01st 2019 12:41 pm
Joined: Jun 2010
Posts: 14,403
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,403
Van Diego California
Mobil 1 N a new filter .... do the switch over.... ell worth it, IF your going to keep it.


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Oil Pressure [Re: Lister] #745803
March 01st 2019 1:02 pm
March 01st 2019 1:02 pm
Joined: Apr 2010
Posts: 2,678
San Diego
W
wrcsixeight Offline
veteran
wrcsixeight  Offline
veteran
W
Joined: Apr 2010
Posts: 2,678
San Diego
Dont discount oil pressure gauge inaccuracies.

I installed a mechanical gauge just because my stock gauge was reading low.

Mechanical gauge reveals good pressure.

I t'd the line so oem gauge still works. Very little correlation between the two.


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