Sound wrong on two counts - shouldn't be that low at idle and shouldn't rise
linearly.
Book states 10 to 25 at hot idle and I think this should be considered an
absolute minimum, mine only gets as low as 25 if left to idle for a long
time in ambients of 80F or so, normally it is around 35 to 40. Hot running
is quoted as 50 to 80 (mine is about 60), but this should be achieved at
quite low revs, say about 2000, and not rise very much after that as it
should be controlled by the pressure relief valve. Sounds like your valve
may be stuck open.
Tip: When you remove it refit the cap *without* the spring, and mark the
cap and block where the threads just start to engage. Then fit the spring,
position the cap so its mark is just before the block mark, then you know
you only have to turn the cap a few degrees whilst fighting spring pressure
to get it started.
PaulH.
----- Original Message -----
From: "Thomas J Pokrefke" <pokrefke1@comcast.net>
To: <mgs@autox.team.net>
Sent: Sunday, March 28, 2004 2:55 PM
Subject: Oil Pressure Question
> After warmed up (measurements taken after a 15 mile high speed tollway
> trip), my MGB shows about 10psi for each 1,000 prm while driving. This
> holds true for idling as well: i show about 10psi for an 950rpm idle.
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