Hmmm, apart from the last one I'd say the readings are fine and don't
indicate a problem with the relief valve, or the gauge or sender for that
matter. The last one indicates loss of viscosity, which could mean the oil
is getting very hot or is poor quality or old. Is the oil cooler in
circuit? I believe Abingdon started putting these in all cars because of
concerns with hot idle pressures. On the V8 in ambients of 50F I can go for
a spirited drive and it idles at 35 immediately afterwards. If I do the
same test in summer the immediate idle is about 25, and if left to idle so
the fans cycle on and off it can drop as low as 15, which is lower than I
would like. But the V8 is known to be a 'high flow' oil system and not a
'high pressure' because of the number of places it escapes from, including
16 hydraulic tappets. When did you last change the oil and what did you
use?
PaulH.
----- Original Message -----
From: "Thomas J Pokrefke" <pokrefke1@comcast.net>
To: <mgs@autox.team.net>
Sent: Sunday, March 28, 2004 5:05 PM
Subject: RE: Oil Pressure Question
> Did a little more testing. At cold startup, the oil pressure was 55lbs @
> idle.
>
> When temp guage was 1/2 way between "C" and "N", the pressure was 40 @
idle.
>
> When temp guage was at "N", the pressure was 35 @ idle.
>
> After a quick spirited drive, the pressure was 13 @ idle.
>
> Would this fit the bill for a relief valve that has failed?
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