As Carter said, the pressure will go to the path of least resistance.
So which ever bearing has the largest clearance that's where the oil will
go.
Pressure wise in a Spit the top half of the engine gets it's pressure from
the end of the cam shaft, I believe it's the journal at the back of the
engine. The bottom of the engine receives most of it's pressure from the
pump itself.
If you have less oil being pumped up to the cam due to large gaps somewhere
else means less upstairs.
The pump pressure goes directly to the Filter before it goes into any
journals.
-----Original Message-----
From: Tburke4@aol.com [mailto:Tburke4@aol.com]
Sent: Tuesday, May 09, 2000 11:51 AM
To: clshore@yahoo.com; CraigS@iewc.com; jmcneal@ohms.com;
spitlist@gte.net; trunnell@mindspring.com
Cc: spitfires@autox.team.net
Subject: Re: Oil preferences
Carter (and everyone else)
Speaking of loose bearings, I wonder if a wide pressure range like this
could
be a indication of a worn or lost thrust washer? I've seen wide oil pressure
ranges certainly on very worn engines, but, maybe a drifting crankshaft
could
also cause such readings and, conversely, such a wide range could be an
indicator of a thrust washer problem?
Any thoughts on that?,
Tom Burke
80 Spit (engine is out, getting a new thrust washer among other things)
In a message dated 05/09/2000 9:00:01 AM Pacific Daylight Time,
clshore@yahoo.com writes:
<< The pressure will be a function of viscosity, and the
bearing with the loosest clearance. The loosest one is
often the camshaft bearing(s). The loosest bearing
will also flow more oil, robbing flow to the other
bearings (remember fixed volume per RPM). And since
the amount of cooling by oil is a function of flow
volume, this then reduces cooling to the rest of the
bearings, etc. >>
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