Most of the 3.9/5.2/5.9L engines idle at about 15-20psi (oil pressure)
and run at 60-70psi at 3000+rpm. The bypass valve is there in case the
filter gets plugged...then it will open and bypass (no filtration).
On using the Mopar filters (as Gary mentioned)...the Anti-Drainback
Valve is much better. Mopar uses a heavier duty valve (anti-drainback)
to prevent the annoying lifter-clack in the mornings (applies to
3.0/3.3/3.9L and can apply to the 5.2/5.9L as well). FYI: Mopar filters
are built by WIX.
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
raymond.irons@gm.com
Sent: Thursday, January 30, 2003 6:56 AM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: Magnum Engines Oil Filtration System WAS: Re: DML:
Trasko Oil Filter - 1/10th of Micron cleaning
I think the pressure the book is referring to is the pressure internal
to the oil filter. If the system pressure is 30 psi and the oil filter
becomes clogged, the oil pressure on the entire system will increase due
to a detected blockage. If the system senses an increase of 9-15 PSI at
the filter, the bypass valve opens and oil flow goes around the filter
thus assuring an adequate supply of oil to the engine.
Anybody else have an idea if this is correct?
Ray Irons
Dover, DE
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