It's a function of the "lifting" capacity of the pump. The lower the level
of oil, in relation to the location of the oil pump, the greater the "lift"
the pump has to make, to draw the oil into it. This translates to less
pressure on the discharge side of the pump.
Although I had to learn all about this in my day job, years ago, I never
equated it to automotive oil pumps until the late 356 engine guru, Harry
Pellow, called it to my attention. It's real and it happens, for sure.
Some pumps are more prone to pressure drop due to lower oil levels than
others, but, nonetheless it happens.
Bud
-----Original Message-----
From: Spridgets [mailto:spridgets-bounces@autox.team.net] On Behalf Of
rrengineer.mike
Sent: Wednesday, August 13, 2014 5:56 AM
To: spridgets@autox.team.net
Subject: [Spridgets] Oil Pressure vs Quantity
My first Bugeye with the original 948 motor that I owned back in 1971 was
kind of strange when it came to oil pressure. B While driving, the oil
pressure would drop from 60 psi to 40 psi after a week or two. B Upon
checking the oil, it was down a quart. B I would add a quart of oil and the
pressure went back up to 60 psi! B I have always wondered about this. Oil
pressure should have nothing to do with oil quantity. B Any ideas of the
mechanics of this? B Mike MacLean
60 Sprite
56 BN2
Sent via the Samsung GALAXY SB. 5, an AT&T 4G LTE smartphone
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