Has anyone ever tried to tap into an oil galley to monitor oil pressure? It
might be interesting to monitor both the pressure at the filter housing and
pressure at the 'end o' the line'.
A large pressure difference between the two might indicate excessive bearing
clearance, while less difference would indicate less wear in the
bearings.... Each lubricated journal is in effect a 'leak', as far as the
pressurized oil line is concerned. After the oil has passed a leak, its
pressure is reduced by an amount related to the amount of oil which bled off
through the clearance between journal and bearing. Large clearance=lots of
oil bleed down=larger pressure drop. Of course this becomes harder to
assess if they used a lot of flow restrictors in the line....
Your thoughts?
-----Original Message-----
From: Tony Rhodes [mailto:ARhodes@compuserve.com]
Sent: Wednesday, November 10, 1999 12:33 PM
To: Power British Performance Parts, Inc.; Triumph List
Subject: RE: Lubricants
Message text written by INTERNET:triumphs-owner@autox.team.net
" As liquids (including oils) are generally considered to be not
compressible
materials, the pressure in the oiling system should be constant throughout
the system."
Brian, I hate to disagree with you here. Yes, oil is essentially
incompressible, but
that does not mean that the oil system must be at the same pressure
throughout.
Think of your garden hose. Your tap has 20 or 30 psi going to it. Now you
open it
part way and let the water flow freely from the open end of the hose. What
is the
pressure of the water at the open end? Not much. What is the pressure
behind
the tap? 20 or so psi.
I would agree that BEHIND the flow limiting orifice, the pressure is
constant. After
that orifice, the pressure may well be very low.
In my old engine, where is the flow limiting orifice? Ilike to think it is
the bearnigs, etc.
But it might be the pressure relief valve!!!! I may have VERY low pressure
at the bearings!?
Hopefully very soon my engine will indeed have 70 psi all the way to the
bearings!
-Tony
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