real oil gauge readings

hi,

part of rebuilding my s/c 95 m-ed was to replace the idiot oil
pressure guage with a real one from an earlier car, (93 i think).
went it is fairly cold, the gauge reads 30 + to almost 60# on higher
rev's but once hot, it reads less than 30 and as low as ~10#.

does this sound right?

i also found the water temp sender on ther left side of the back side
of the motor, so my water gauge works now too...next is the a/c
trouble shooting, (elec i think)
tia,
peter

In article
>,
peter > wrote:

> part of rebuilding my s/c 95 m-ed was to replace the idiot oil
> pressure guage with a real one from an earlier car, (93 i think).
> went it is fairly cold, the gauge reads 30 + to almost 60# on higher
> rev's but once hot, it reads less than 30 and as low as ~10#.
>
> does this sound right?

Normal pressures using the recommended 10W30 vary with oil temperature
and rpm.

Cold idle 50-60 psi, cold 4000 rpm 80-90 psi.
Hot idle 20-30 psi, hot 4000 rpm 50-60 psi.

10 psi seems a little low, but as long as it comes up with rpm I
wouldn't worry. Miata gauges aren't terribly accurate anyway.

--
Lanny Chambers
St. Louis, MO
'94C

On Aug 19, 8:06*pm, Lanny Chambers > wrote:
> In article
> >,
>
> *peter > wrote:
> > part of rebuilding my s/c 95 m-ed was to replace the idiot oil
> > pressure guage with a real one from an earlier car, (93 i think).
> > went it is fairly cold, the gauge reads 30 + to almost 60# on higher
> > rev's but once hot, it reads less than 30 and as low as ~10#.
>
> > does this sound right?
>
> Normal pressures using the recommended 10W30 vary with oil temperature
> and rpm.

castrol 5w30

>
> Cold idle 50-60 psi, cold 4000 rpm 80-90 psi.
> Hot idle 20-30 psi, hot 4000 rpm 50-60 psi.
>
> 10 psi seems a little low, but as long as it comes up with rpm I
that is a guess butt...

> wouldn't worry. Miata gauges aren't terribly accurate anyway.

maybe that is why they went to the idiot-style gauge, eh

thanks lenny

On Wed, 19 Aug 2009 18:31:31 -0700 (PDT), peter >
wrote:

>On Aug 19, 8:06*pm, Lanny Chambers > wrote:
>> In article
>> >,
>>
>> *peter > wrote:
>> > part of rebuilding my s/c 95 m-ed was to replace the idiot oil
>> > pressure guage with a real one from an earlier car, (93 i think).
>> > went it is fairly cold, the gauge reads 30 + to almost 60# on higher
>> > rev's but once hot, it reads less than 30 and as low as ~10#.
>>
>> > does this sound right?
>>
>> Normal pressures using the recommended 10W30 vary with oil temperature
>> and rpm.
>
>castrol 5w30
>
>>
>> Cold idle 50-60 psi, cold 4000 rpm 80-90 psi.
>> Hot idle 20-30 psi, hot 4000 rpm 50-60 psi.
>>
>> 10 psi seems a little low, but as long as it comes up with rpm I
>that is a guess butt...
>
>> wouldn't worry. Miata gauges aren't terribly accurate anyway.

i'm assuming that your oil is topped off and the oil was changed
recently. my gauge will occasionally show lower pressure when i'm a
quart low and that goes away when the oil is topped off and/or when
the oil is changed.

>maybe that is why they went to the idiot-style gauge, eh
>
>thanks lenny


--------
"any words spelled incorrectly are probably typing errors"

On Aug 20, 2:12*pm, barry > wrote:
> On Wed, 19 Aug 2009 18:31:31 -0700 (PDT), peter >
> wrote:
>
>
>
> >On Aug 19, 8:06*pm, Lanny Chambers > wrote:
> >> In article
> >> >,
>
> >> *peter > wrote:
> >> > part of rebuilding my s/c 95 m-ed was to replace the idiot oil
> >> > pressure guage with a real one from an earlier car, (93 i think).
> >> > went it is fairly cold, the gauge reads 30 + to almost 60# on higher
> >> > rev's but once hot, it reads less than 30 and as low as ~10#.
>
> >> > does this sound right?
>
> >> Normal pressures using the recommended 10W30 vary with oil temperature
> >> and rpm.
>
> >castrol 5w30
>
> >> Cold idle 50-60 psi, cold 4000 rpm 80-90 psi.
> >> Hot idle 20-30 psi, hot 4000 rpm 50-60 psi.
>
> >> 10 psi seems a little low, but as long as it comes up with rpm I
> >that is a guess butt...
>
> >> wouldn't worry. Miata gauges aren't terribly accurate anyway.
>
> i'm assuming that your oil is topped off and the oil was changed
> recently. my gauge will occasionally show lower pressure when i'm a
> quart low and that goes away when the oil is topped off and/or when
> the oil is changed.

excellent point, it is a new motor so i did not check but i wont
forgot this idea.
peter

> "any words spelled incorrectly are probably typing errors"

~10 psi --That's low for a motor in good condition with low mileage.

"excellent point, it is a new motor so i did not check but i wont
forgot this idea.
peter"

"peter" > wrote in message
...
On Aug 20, 2:12 pm, barry > wrote:
> On Wed, 19 Aug 2009 18:31:31 -0700 (PDT), peter >
> wrote:
>