Today's Message Index:
----------------------
1. 05:10 AM - Re: Engines-List Digest: 3 Msgs - 09/01/05 (Gary Casey)
2. 06:15 AM - Oil pressure relief valve? (Grant Corriveau)
3. 02:58 PM - Re: Oil pressure relief valve? (Gilles St-Pierre)
Message 1
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| Subject: | Re: Engines-List Digest: 3 Msgs - 09/01/05 |
--> Engines-List message posted by: Gary Casey <glcasey@adelphia.net>
> Another question that maybe some of you have experience with: What
> can
> most likely be the causes for an increase in oil pressure(also
> Lycoming
> O-540)from normally about 80 psi to suddenly near 100 with the same
> oil
> temperature and other conditions like same weight/brand of oil, power
> settings and RPM, etc? It has been suggested that a main bearing could
> have rotated and blocked flow, but I would think the oil pressure
> relief
> valve would still hold the pressure stable by relieving the excess
> pressure caused by reduced total oil flow?
Yes, in theory the pressure regulator will hold a fixed pressure, but
in practice the pressure of the system is dependent on oil flow -
restrict the oil flow and the regulator will allow a higher
pressure. It just isn't a sophisticated enough design to be very
accurate. If all the conditions you described really stayed the
same, but the oil pressure suddenly changed, either up or down, I
would be very worried about something in the system that has
changed. It could be something in the regulator itself, or it could
be a doomsday scenario as you suggested. I would start with the
externally-accessible devices first - regulator, filter, cooler,
vernatherm. If none of these have any obvious plugging or other
defect - and an oil analysis shows metal, it is probably time to go
in. But I'm not any kind of expert - that's just what I would do.
I've found that things important, like airplane engines, don't change
characteristics without a cause. As my old boss in the transmission
development shop in GM said as he stood over the smoldering ruins of
my experimental transmission, "I think it's trying to tell us
something..."
Gary Casey
Message 2
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| Subject: | Oil pressure relief valve? |
--> Engines-List message posted by: Grant Corriveau <grantc@ca.inter.net>
> check the relieve valve spring for binding..Could be wise to put a new one
> in
> gilles st pierre
I have a CAM100 (Honda 1.5L conversion) and my oil pressure this year has
crept slightly above the max limit during warmup... (up from 60 to 63
psi...)
If this is a trend, where/how would I find and correct an oil pressure
relief valve? Is there one installed in every engine? OR is it a feature
incorporated into the oil filter??
Thanks in advance
--
Grant Corriveau
C-GHTF / HDS / CAM100
Message 3
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| Subject: | Oil pressure relief valve? |
--> Engines-List message posted by: "Gilles St-Pierre" <ranchlaseigneurie@hotmail.com>
Normaly located at the base where the oil filter screws
gilles
>From: Grant Corriveau <grantc@ca.inter.net>
>Reply-To: engines-list@matronics.com
>To: <engines-list@matronics.com>
>Subject: Engines-List: Oil pressure relief valve?
>Date: Fri, 02 Sep 2005 09:14:11 -0400
>
>--> Engines-List message posted by: Grant Corriveau <grantc@ca.inter.net>
>
>
> > check the relieve valve spring for binding..Could be wise to put a new
>one
> > in
> > gilles st pierre
>
>I have a CAM100 (Honda 1.5L conversion) and my oil pressure this year has
>crept slightly above the max limit during warmup... (up from 60 to 63
>psi...)
>
>If this is a trend, where/how would I find and correct an oil pressure
>relief valve? Is there one installed in every engine? OR is it a feature
>incorporated into the oil filter??
>
>Thanks in advance
>--
>Grant Corriveau
>C-GHTF / HDS / CAM100
>
>
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