Well, I put one on a new engine (less than 500 miles) just because I was
replacing the spring anyway. So far, it just gives me perhaps an increase
of 10 psi when it peaks, around 3000 rpm. Its normal now to see 75-80 psi
instead of 60-70 psi. I'm not sure if it will help at all if the bearings
are knackered. The relief valve just "releases" once a certain pressure is
achieved so if the bearings are shot, I don't think that release pressure
is ever achieved. And it doesn't look like the relief spring effects the
idling oil pressure at all, which is why I replaced it on mine. So in
short, as near as I can tell, I don't think there is any real advantage of
uprated versus standard except maybe in high rpm racing applications.
On a related note, my very first MGB was a 1965, ran a maximum 40 psi at
speed and idled at 10. One of the first things I did was to replace the oil
pressure relief spring and as I recall, there either was no difference or a
very minimal difference (this was almost 30 years ago). The rod bearings
were shot and only the eventual engine overhaul was going to fix it. I
don't think an oil pressure relief spring or an uprated one will solve or
mask the problem at all.
David Councill
67 BGT
72 B
At 04:50 PM 3/29/2004 +0100, Paul Hunt wrote:
>Give you artificial peace of mind if the bearings are knackered? Con a
>prospective purchaser? I have seen it writ that it is a *bad* thing on an
>engine with good bearings, the increased pressure can cause bearing erosion.
>
>PaulH.
>
>----- Original Message -----
>From: "Paul M." <rowman22001@yahoo.com>
>To: <mgs@autox.team.net>
>Sent: Monday, March 29, 2004 4:00 PM
>Subject: Re: Oil Pressure Question
>
>
> > What is the theroetical (and real) advantage of
> > fitting the uprated oil pressure relief spring?
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