Subject: Re: [Healeys] Oil pressure gauge response

From: Oudesluys <[email-masked]>
Date: Thu, 1 Sep 2016 09:21:29 +0200

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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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    <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:[email-masked]"
      type="cite">
      <meta http-equiv="Context-Type" content="text/html; charset=UTF-8">
      <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>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
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_______________________________________________
Archive: http://www.team.net/archive

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---

From: Bob Spidell <[email-masked]>
Date: Thu, 1 Sep 2016 04:33:56 -0700

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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.
>> 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?
>> 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:[email-masked]"
      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:[email-masked]"
        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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[email-masked]

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From: "J. Scott Morris" <[email-masked]>
Date: Thu, 1 Sep 2016 14:17:21 +0000 (UTC)

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HelloStephen; =C2=A0=C2=A0=C2=A0A longtime ago, back on October 15 2001, Ad=
nan Merchant asked about a delay in oilpressure: =E2=80=9CIf there is a del=
ay, might it imply that there is air in the line orsome other restriction s=
omewhere?=E2=80=9D=C2=A0In response, Michael Salter wrote: =C2=A0=E2=80=9CH=
i Adnan,=C2=A0 There is a restrictor at the block on the oil pressure line.=
 If the line is full of air the pressure takes some time to build on the ga=
uge, particularly when cold, because sufficient oil has to pass through the=
 restrictor to compress the air in the line to the indicated pressure.=C2=
=A0 If the line is bled at the gauge, to remove all the air, the pressure r=
eading should be almost instantaneous because, of course, oil is not very c=
ompressible.=E2=80=9D=C2=A0This may help you figure it out.=C2=A0--Scott Mo=
rris; Simcoe, Ontario, Canada=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 - Keep Smiling, Murphy Lives=20

    On Wednesday, August 31, 2016 9:30 PM, Stephen Hutchings <s.hutchings@r=
ogers.com> wrote:
=20

 Again, thanks to everyone who replied to the BJ8 oil pressure survey- inte=
resting variety of responses.My oil pressure figures fall well within the a=
cceptable figures, but what I'm wondering about is the time it takes for th=
e needle on the gauge to come up.
I haven't actually timed this, but mine seems to take an uncomfortable leng=
th of time to come up on a cold start. Could this just be air in the line d=
elaying the response of the gauge- the pressure relief valve...ideas?Whenev=
er I change the oil filter it's full, so I don't think it's the filter fill=
ing up. I understand that this is a vague question until I've actually time=
d it, but I wondered if anyone else had had the same concern.Thanks,
Stephen, BJ8

[email-masked]

@yahoo.com

  =20
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</div><div id=3D"yui_3_16_0_ym19_1_1472734905540_23319" style=3D"background=
:white"><span id=3D"yui_3_16_0_ym19_1_1472734905540_23320" style=3D"font-si=
ze:11.0pt">Hello
</span><span id=3D"yui_3_16_0_ym19_1_1472734905540_23321" style=3D"font-siz=
e:11.0pt;mso-fareast-font-family:&quot;Times New Roman&quot;;color:black;ms=
o-fareast-language:EN-CA">Stephen; <span id=3D"yui_3_16_0_ym19_1_1472734905=
540_23322" style=3D"mso-spacerun:yes">&nbsp;&nbsp;&nbsp;</span></span><span=
 id=3D"yui_3_16_0_ym19_1_1472734905540_23323" style=3D"font-size:11.0pt">A =
long
time ago, back on October 15 2001, Adnan Merchant asked about a delay in oi=
l
pressure: =E2=80=9CIf there is a delay, might it imply that there is air in=
 the line or
some other restriction somewhere?=E2=80=9D</span></div>

<pre id=3D"yui_3_16_0_ym19_1_1472734905540_23324" style=3D"tab-stops:91.6pt=
 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 54=
9.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span id=3D"yui_3_16_0_ym19_1_147273=
4905540_23325" style=3D"font-size:11.0pt;font-family:&quot;Times New Roman&=
quot;,&quot;serif&quot;">&nbsp;</span></pre><pre id=3D"yui_3_16_0_ym19_1_14=
72734905540_23326" style=3D"tab-stops:91.6pt 137.4pt 183.2pt 229.0pt 274.8p=
t 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 7=
32.8pt"><span id=3D"yui_3_16_0_ym19_1_1472734905540_23327" style=3D"font-si=
ze:11.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">In res=
ponse, Michael Salter wrote: <span id=3D"yui_3_16_0_ym19_1_1472734905540_23=
328" style=3D"mso-spacerun:yes">&nbsp;</span>=E2=80=9CHi Adnan,<span id=3D"=
yui_3_16_0_ym19_1_1472734905540_23329" style=3D"mso-spacerun:yes">&nbsp; </=
span>There is a restrictor at the block on the oil pressure line. If the li=
ne is full of air the pressure takes some time to build on the gauge, parti=
cularly when cold, because sufficient oil has to pass through the restricto=
r to compress the air in the line to the indicated pressure.<span id=3D"yui=
_3_16_0_ym19_1_1472734905540_23330" style=3D"mso-spacerun:yes">&nbsp; </spa=
n>If the line is bled at the gauge, to remove all the air, the pressure rea=
ding should be almost instantaneous because, of course, oil is not very com=
pressible.=E2=80=9D</span></pre><pre id=3D"yui_3_16_0_ym19_1_1472734905540_=
23331" style=3D"tab-stops:91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 36=
6.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><spa=
n id=3D"yui_3_16_0_ym19_1_1472734905540_23332" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Times New Roman&quot;,&quot;serif&quot;">&nbsp;</span></pre=
><pre id=3D"yui_3_16_0_ym19_1_1472734905540_23333" style=3D"tab-stops:91.6p=
t 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 5=
49.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span id=3D"yui_3_16_0_ym19_1_14727=
34905540_23334" style=3D"font-size:11.0pt;font-family:&quot;Times New Roman=
&quot;,&quot;serif&quot;">This may help you figure it out.</span></pre><div=
 id=3D"yui_3_16_0_ym19_1_1472734905540_23214">&nbsp;</div><div id=3D"yui_3_=
16_0_ym19_1_1472734905540_23234" class=3D"signature">--Scott Morris; Simcoe=
, Ontario, Canada&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - Keep Sm=
iling, Murphy Lives</div> <div class=3D"qtdSeparateBR"><br><br></div><div s=
tyle=3D"display: block;" class=3D"yahoo_quoted"> <div style=3D"font-family:=
 garamond, new york, times, serif; font-size: 16px;"> <div style=3D"font-fa=
mily: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-=
serif; font-size: 16px;"> <div dir=3D"ltr"><font face=3D"Arial" size=3D"2">=
 On Wednesday, August 31, 2016 9:30 PM, Stephen Hutchings &lt;s.hutchings@r=
ogers.com&gt; wrote:<br></font></div>  <br><br> <div class=3D"y_msg_contain=
er"><div id=3D"yiv2518868263"><div><div style=3D"color:#000;background-colo=
r:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif;font-size:16px;"><div id=3D"yiv2518868263yui_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=3D"yiv2518=
868263yui_3_16_0_ym19_1_1472672124595_9012">My oil pressure figures fall we=
ll 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=3D"yiv2518868=
263yui_3_16_0_ym19_1_1472672124595_9056"><br></div><div id=3D"yiv2518868263=
yui_3_16_0_ym19_1_1472672124595_9057">I haven't actually timed this, but mi=
ne 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- th=
e pressure relief valve...ideas?</div><div id=3D"yiv2518868263yui_3_16_0_ym=
19_1_1472672124595_9105">Whenever I change the oil filter it's full, so I d=
on't think it's the filter filling up. I understand that this is a vague qu=
estion until I've actually timed it, but I wondered if anyone else had had =
the same concern.</div><div id=3D"yiv2518868263yui_3_16_0_ym19_1_1472672124=
595_9178">Thanks,</div><div id=3D"yiv2518868263yui_3_16_0_ym19_1_1472672124=
595_9219"><br></div><div id=3D"yiv2518868263yui_3_16_0_ym19_1_1472672124595=
_9220">Stephen, BJ8<br></div></div></div></div><br>________________________=
_______________________<br>Support Team.Net <a href=3D"http://www.team.net/=
donate.html" target=3D"_blank">http://www.team.net/donate.html</a><br>Sugge=
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><br><br><br><br></div>  </div> </div>  </div></div></body></html>
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