 Oil Pressure vs Oil Level |
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| vesnyder |
 May 18 2008, 05:57 PM
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#1
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Senior Member  Group: Members Posts: 680 Joined: 14-April 05 From: Cleveland, OH Member No.: 3,933  |
Is there any correlation between the oil level and the oil pressure? Will the oil pressure go down as the oil level goes down?
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Replies(1 - 7)
| r_towle |
May 18 2008, 06:04 PM
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#2
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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yes
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| Joe Bob |
May 18 2008, 06:05 PM
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#3
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
yes, II
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| pin31 |
May 18 2008, 06:14 PM
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#4
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Member Group: Members Posts: 398 Joined: 30-January 07 From: Newport, Rhode Island Member No.: 7,492 Region Association: North East States |
Makes sense don't it.
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| bperry |
May 18 2008, 06:40 PM
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#5
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Lurker Group: Members Posts: 477 Joined: 16-February 04 From: Dallas, Tx Member No.: 1,661 |
Not sure I follow this one.
Why would the pressure be lower? Aren't the relief pistons and springs there to maintain pressure? Ok, I could see it if there is cavitation inside the pump, foaming in the oil, thinner oil because lower oil levels makes the oil run hotter, or perhaps that the pump runs dry during high revs or long turns, but why in general would the pressure drop just because the oil level was lower? --- bill |
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| Dave_Darling |
May 18 2008, 07:06 PM
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#6
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914 Idiot Group: Members Posts: 15,200 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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The pressure will vary depending on the level only if the level drops enough that the pickup tube starts sucking oil...
Alternately, if having less oil in the sump makes the oil heat up more, the heat will thin the oil out so the pressure will drop. Otherwise, no. The oil level has no direct relation to the oil pressure. --DD |
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| ConeDodger |
May 18 2008, 07:33 PM
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#7
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Apex killer! Group: Members Posts: 24,099 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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I agree with Dave. Oil level does not effect pressure until the pick up tube starts sucking air. Viscosity changes as the oil heats up and this effects pressure. Oil temperature has a more direct relationship to oil level. Less oil doing the cooling work of optimum level will have a higher temperature.
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| r_towle |
May 18 2008, 07:42 PM
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#8
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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how many quarts does a 914 hold.....
I answered simple. If he is low, the sump will suck air...the pump will cavitate and the oil pressure will be lower. Rich |
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