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Re: oil pressure fluctuations

To: MG List <>
Subject: Re: oil pressure fluctuations
From: Max Heim <>
Date: Fri, 29 Jun 2001 17:41:11 -0700
Hmm, in 4th OD I am usually cruising at 3000rpm... <g>... at which point I
am showing about 70psi warm. I don't think 45 means anything is wrong,
though, given the margin of error in the gauge calibration.

I have heard that the oscillation may be due to the oil pressure relief
valve opening and closing, when by pure chance the current pressure is right
at the threshold. Seems plausible, and I have observed this phenomenon
myself occasionally, although usually at idle in my case.

on 6/29/01 9:17 AM, DenverD at wrote:

> cruising at 2000 RPM, 4th gear + overdrive..
> before the oil is warmed good the oil pressure is 60+ PSI and
> steady..
> as it heats it drops to about 45 or so...
> and usually stays steady..
> but sometimes, (and i can't pin it to anything--like going up or
> down a hill, around a curve etc) the oil pressure fluctuates from
> 40 to 60 back and forth, back and forth....maybe taking a second
> and a half from 40 to 60 and back to 40..
> the needle swings smoothly up and back..
> it may do that for a minute or two and then smooth out again at
> about 45..
> the dip stick shows oil right up to the full mark..
> ideas?
> what should a "good" '71 engine have for PSI at 2000 RPM, 72 degree
> day, 5w40 synthetic oil? (i STILL have not received my books
> ordered 8 weeks ago)
> DenverD - A Texan in Denmark
> 65B # GHN3L/33680; engine 18V581-H193


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.

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