By what all the local racers say in my neck of the woods,
" A pressure is what your after "
As long as you have a pressure your good to go at idle.
Running pressure is a little more important, an engine at high revs needs
the circulation of the oil, one of the major reasons for oil in an engine is
for cooling, of course the lubrication is part of it but with just
lubrication and no cooling any engine will eventually get too hot.
A major problem of high revving engines is oil foaming, foamed oil carries
air, air is not good in a lubrication or cooling of an engine that is under
a lot of stress. The racer on the list probably have oil pans customized to
reduce the foaming of the oil.
So all that junk said, a positive pressure is needed, a HIGH pressure is
bad.
Make sense ?
-----Original Message-----
From: Jeff McNeal [mailto:jmcneal@ohms.com]
Sent: Tuesday, May 09, 2000 10:05 AM
To: Joe Curry; trunnell@mindspring.com
Cc: spitfires@autox.team.net
Subject: Re: Oil preferences
According to my specs, Mk3 engines (1296) should run at about 50psi at 2,000
RPM. If you're only running 45 psi at 3,500-4,500 RPM, I think that Joe
might be onto something,
Best wishes,
Jeff in San Diego
'67 RHD Spitfire Mk3 aka "Mrs. Jones"
Jeff's Classic '67 Spitfire Mk3 site & Vintage Spitfire Webring
http://www.ohms.com/spitfire/spitfire.shtml
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----- Original Message -----
From: Joe Curry <spitlist@gte.net>
To: <trunnell@mindspring.com>
Cc: <spitfires@autox.team.net>
Sent: Tuesday, May 09, 2000 7:19 AM
Subject: Re: Oil preferences
>
> Glenn,
> My oil pressure does not have the drop that you mention. I use the same
oil you do. The difference may be in the engine. As the
> thing heats up, tolerances become wider, oil galleries and bearings widen
and more oil flows causing the pressure to drop. How long
> has it been since the engine was overhauled? This might be an omen of an
impending overhaul in your future.
>
> Joe
>
>
> Glenn wrote:
> >
> > Hi,
> >
> > Since I installed my oil pressure gauge I am amazed at how much the
viscosity drops during highway driving especially on hot days. I am
currently running Castrol GTX 20-50. After driving about 40 miles to work
at about 65- 75 mph the oil pressure will drop to about 45 psi at speed and
about 15 psi at idle. Around town the pressure drop is not as bad. Has
anyone had better success with a different brand of oil. I don't have an oil
cooler, but it's looking like I might need one.
> >
> > Thanks,
> > Glenn
>
>
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