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Re: Oil Pressure Question

To: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>
Subject: Re: Oil Pressure Question
From: pokrefke1@comcast.net
Date: Mon, 29 Mar 2004 16:33:48 +0000
The last oil change was about 50 miles ago and I used fully synthetic Valvoline 
20W-50 with a Fram PH43 filter.  There is an oil cooler fitted. 

> 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.
> 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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