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FWIW, my BN2 and BJ8 show oil pressure within 3 seconds of a cold start,
a little longer if I've just changed the oil. But, I usually have to
crank them for 5-10 seconds before they fire, and that should get the
pressure buildup started.
Bob
On 9/1/2016 12:21 AM, Oudesluys wrote:
> Nothing to do with the air in the line to the oil pressure gauge. Air
> in the line is needed to even out vibrations of the needle due to the
> small pressure pulses from the oil pump. It is not uncommon that
> pressure build up is delayed. How and why this happens and why within
> the same make and type of engine it occurs or not is often unclear.
> On my car (Jensen Healey) I can have pressure from cold (or hot for
> that matter) practically instantaneous or it can last up to half a
> minute or more. Most JH's/Lotus 907 engines show this delay and it is
> the most extreme in any engine I have encountered.
> Always start the engine without revving it. Leave it idling and do not
> drive away until you have oil pressure.
> It does not seem to harm the engine as on my first JH I did over
> 160.000mls without any degradation of the oil pressure and/or bearings.
> Kees Oudesluijs
>
> Op 31-8-2016 om 21:47 schreef Stephen Hutchings:
>> Again, thanks to everyone who replied to the BJ8 oil pressure survey-
>> interesting variety of responses.
>> My oil pressure figures fall well within the acceptable figures, but
>> what I'm wondering about is the time it takes for the needle on the
>> gauge to come up.
>>
>> I haven't actually timed this, but mine seems to take an
>> uncomfortable length of time to come up on a cold start. Could this
>> just be air in the line delaying the response of the gauge- the
>> pressure relief valve...ideas?
>> Whenever I change the oil filter it's full, so I don't think it's the
>> filter filling up. I understand that this is a vague question until
>> I've actually timed it, but I wondered if anyone else had had the
>> same concern.
>> Thanks,
>>
>> Stephen, BJ8
>>
>>
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FWIW, my BN2 and BJ8 show oil pressure within 3 seconds of a cold
start, a little longer if I've just changed the oil. But, I usually
have to crank them for 5-10 seconds before they fire, and that
should get the pressure buildup started.<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 9/1/2016 12:21 AM, Oudesluys wrote:<br>
</div>
<blockquote
cite="mid:ab963c40-3900-8cc0-d50d-2c9cafa6cb55@chello.nl"
type="cite">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
<div class="moz-cite-prefix">Nothing to do with the air in the
line to the oil pressure gauge. Air in the line is needed to
even out vibrations of the needle due to the small pressure
pulses from the oil pump. It is not uncommon that pressure build
up is delayed. How and why this happens and why within the same
make and type of engine it occurs or not is often unclear.<br>
On my car (Jensen Healey) I can have pressure from cold (or hot
for that matter) practically instantaneous or it can last up to
half a minute or more. Most JH's/Lotus 907 engines show this
delay and it is the most extreme in any engine I have
encountered.<br>
Always start the engine without revving it. Leave it idling and
do not drive away until you have oil pressure. <br>
It does not seem to harm the engine as on my first JH I did over
160.000mls without any degradation of the oil pressure and/or
bearings.<br>
Kees Oudesluijs<br>
<br>
Op 31-8-2016 om 21:47 schreef Stephen Hutchings:<br>
</div>
<blockquote
cite="mid:1243071703.2755766.1472672863475@mail.yahoo.com"
type="cite">
<meta http-equiv="Context-Type" content="text/html; ">
<div>
<div id="yui_3_16_0_ym19_1_1472672124595_8935">Again, thanks
to everyone who replied to the BJ8 oil pressure survey-
interesting variety of responses.</div>
<div id="yui_3_16_0_ym19_1_1472672124595_9012">My oil pressure
figures fall well within the acceptable figures, but what
I'm wondering about is the time it takes for the needle on
the gauge to come up.</div>
<div id="yui_3_16_0_ym19_1_1472672124595_9056"><br>
</div>
<div id="yui_3_16_0_ym19_1_1472672124595_9057">I haven't
actually timed this, but mine seems to take an uncomfortable
length of time to come up on a cold start. Could this just
be air in the line delaying the response of the gauge- the
pressure relief valve...ideas?</div>
<div id="yui_3_16_0_ym19_1_1472672124595_9105">Whenever I
change the oil filter it's full, so I don't think it's the
filter filling up. I understand that this is a vague
question until I've actually timed it, but I wondered if
anyone else had had the same concern.</div>
<div id="yui_3_16_0_ym19_1_1472672124595_9178">Thanks,</div>
<div id="yui_3_16_0_ym19_1_1472672124595_9219"><br>
</div>
<div id="yui_3_16_0_ym19_1_1472672124595_9220">Stephen, BJ8<br>
</div>
</div>
<br>
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