Can't say I've ever noticed the pressure going *up* on either of mine as the
oil warms, 10W/40 or 20W/50. The V8 takes a while to get there, a slow and
steady rise, but it does that regardless of temperature. That used to be my
daily driver, kept outside in all weathers, several periods of well below
freezing. Rarely take the roadster out in freezing weather, only it's not
been out for a month because of the weather, and then only on the salt-free
roads in the immediate locality.
The gauge is easy to check - simply try another one and tube on the engine.
It's possible it's nothing more than a pinched or gunged oil gauge pipe
severely restricting how quickly cold oil can move up the pipe to move the
pointer. With air in the pipe the oil has to move several inches. I've
seen recommendations to bleed the pipe, which does greatly reduce the
distance the oil has to move, but then it has the friction of the whole pipe
to contend with. I've tried both ways on my V8 and it made no noticeable
difference at all.
I can't see the pressure relief valve being the problem, if that were
sticking when cold pressure would be high, not low. I can imagine very
thick oil being difficult for the pump to pull through a restriction and
causing low pressure, but 10W/40 shouldn't be that thick, so it would have
to be a significant restriction. I could imagine that on one engine, less
so on two. If it is a restriction causing pressures to be that low it's
flow through the bearings that would be the concern. But the bottom line is
that those pressures on the 64 are on the low side anyway.
PaulH.
----- Original Message -----
> So the problem is what happens in cold weather. I had to evict the 64B
> from the garage while doing some work on the 72B and when I start the 64B
> at temperatures below maybe 20-25 degrees, the pressure only comes up to
> 10 psi and stays there for 2-3 minutes until the engine starts warming up
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