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I've had my HD8 carbs out/apart a few times for rebuilds or for head
work, etc., and I've not seen any evidence that--for my carbs,
anyway--the oil is lost by any means other than exiting the vent in the
cap (two oily splotches on the underside of the bonnet). The vacuum seal
around the piston in the vacuum chamber has to be all but airtight, and
I'm told they are custom machined and fitted to each other (i.e. you
don't want to swap parts in SUs).
On 6/18/2021 6:58 AM, i erbs via Healeys wrote:
> Seems oil could leave arournd threads of dashpots or out vent holes in
> dashpots
>
> Ira Erbs
> 1959 AH 100-6
> 1967 MGB
> Milwaukie, OR
>
> On Fri, Jun 18, 2021, 6:46 AM healeyguy--- via Healeys
>
> Bob etal
> Contemplating the damper oil loss. What is the path of the engine
> vacuum that allows/causes the oil to disappear.
> If the engine is not running there is no vacuum, therefore no way
> for oil loss in an SU carb.
> Engine running, engine vacuum could potentially pull at carb parts
> interface that control the oil reservoir at two locations,
> That being the fit of the damper plunger tip to the tube in the
> piston or the fit of the outside of the piston tube to the chamber.
> Suspect that oil loss is a result of a poor fit at these locations.
> P
>
> -----Original Message-----
> To: Michael Salter <michaelsalter@gmail.com
> Sent: Thu, Jun 17, 2021 11:16 pm
> Subject: Re: [Healeys] HD8 Su's
>
> Yeah ... I overfill a little and let them find their level.
>
> On 6/17/2021 9:34 AM, Michael Salter wrote:
> Actually Bob even that is too much ... resistance just before the
> cap reaches the threads is sufficient. At that level I find that
> the oil never goes away.
>
>
>
> On Thu., Jun. 17, 2021, 10:34 a.m. Bob Spidell,
>
> My observation as well. I fill them until you feel resistance
> when the cap is about a half inch from the top of the carb.
>
>
> On 6/16/2021 10:47 PM, Alan Seigrist via Healeys wrote:
>> Roger -
>>
>> you don't need that much oil in the HD8 pistons for this to
>> work correctly. HD8s throw all excess oil out the vent... so
>> if you are overfilling it will all go out anyway.
>>
>> The main thing to check is to take the dampers out and slide
>> them back in with the shaft straight up, and if you feel
>> resistance toward the bottom.... you don't need to refill. I
>> suspect you are overthinking it. I used to think HD8s use too
>> much oil until I realised they don't need all that much to
>> work correctly.
>>
>> Cheers,
>>
>> Alan
>>
>> On Thu, Jun 17, 2021 at 12:59 AM Roger Grace via Healeys
>>
>> Ok have spoken to Joe who was most helpful.
>> We did some measurements together over the phone and
>> established that my dampers are correct.
>> He says that he has encountered this before but not sure
>> of the reason.
>> Suggests that I run the dashpots dry then start again.
>> In meantime he will do more research.
>> rg
>>
>>
>
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I've had my HD8 carbs out/apart a few times for rebuilds or for head
work, etc., and I've not seen any evidence that--for my carbs,
anyway--the oil is lost by any means other than exiting the vent in
the cap (two oily splotches on the underside of the bonnet). The
vacuum seal around the piston in the vacuum chamber has to be all
but airtight, and I'm told they are custom machined and fitted to
each other (i.e. you don't want to swap parts in SUs).<br>
<br>
<br>
<div class="moz-cite-prefix">On 6/18/2021 6:58 AM, i erbs via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABXhz891FcXVYtUggMA0V2d_P=UjkSnL0TVLtO1pcO4aDH8__w@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">Seems oil could leave arournd threads of dashpots
or out vent holes in dashpots<br>
<br>
<div data-smartmail="gmail_signature">Ira Erbs<br>
1959 AH 100-6<br>
1967 MGB<br>
Milwaukie, OR</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jun 18, 2021, 6:46 AM
healeyguy--- via Healeys <<a
href="mailto:healeys@autox.team.net";
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="color:black;font:10pt Arial,Helvetica,sans-serif">Bob
etal
<div>Contemplating the damper oil loss. What is the path of
the engine vacuum that allows/causes the oil to
disappear. </div>
<div>If the engine is not running there is no vacuum,
therefore no way for oil loss in an SU carb.</div>
<div>Engine running, engine vacuum could potentially pull at
carb parts interface that control the oil reservoir at two
locations, </div>
<div>That being the fit of the damper plunger tip to the
tube in the piston or the fit of the outside of the piston
tube to the chamber. </div>
<div>Suspect that oil loss is a result of a poor fit at
these locations.</div>
<div>P<br>
<br>
<div
style="font-family:arial,helvetica;font-size:10pt;color:black"><font
size="2">-----Original Message-----<br>
From: Bob Spidell <<a
href="mailto:bspidell@comcast.net"; target="_blank"
rel="noreferrer"
moz-do-not-send="true">bspidell@comcast.net</a>><br>
To: Michael Salter <<a
href="mailto:michaelsalter@gmail.com";
target="_blank" rel="noreferrer"
moz-do-not-send="true">michaelsalter@gmail.com</a>><br>
Cc: <a href="mailto:healeys@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys@autox.team.net</a>
<<a href="mailto:healeys@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys@autox.team.net</a>><br>
Sent: Thu, Jun 17, 2021 11:16 pm<br>
Subject: Re: [Healeys] HD8 Su's<br>
<br>
<div id="m_4835443311576230233yiv9259953231">
<div> Yeah ... I overfill a little and let them find
their level.<br clear="none">
<br clear="none">
<div
id="m_4835443311576230233yiv9259953231yqtfd17584">
<div>On 6/17/2021 9:34 AM, Michael Salter wrote:<br
clear="none">
</div>
<blockquote type="cite"> </blockquote>
</div>
</div>
<div
id="m_4835443311576230233yiv9259953231yqtfd65316">
<div>
<div>Actually Bob even that is too much ...
resistance just before the cap reaches the
threads is sufficient. At that level I find
that the oil never goes away.
<div><br clear="none">
</div>
<div><br clear="none">
</div>
</div>
<br clear="none">
<div>
<div dir="ltr">On Thu., Jun. 17, 2021, 10:34
a.m. Bob Spidell, <<a rel="nofollow
noopener noreferrer noreferrer"
shape="rect"
href="mailto:bspidell@comcast.net";
target="_blank"
moz-do-not-send="true">bspidell@comcast.net</a>>
wrote:<br clear="none">
</div>
<blockquote style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div> My observation as well. I fill them
until you feel resistance when the cap is
about a half inch from the top of the
carb.<br clear="none">
<br clear="none">
<br clear="none">
<div>On 6/16/2021 10:47 PM, Alan Seigrist
via Healeys wrote:<br clear="none">
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">Roger -
<div><br clear="none">
</div>
<div>you don't need that much oil in
the HD8 pistons for this to work
correctly. HD8s throw all excess
oil out the vent... so if you are
overfilling it will all go out
anyway.</div>
<div><br clear="none">
</div>
<div>The main thing to check is to
take the dampers out and slide
them back in with the shaft
straight up, and if you feel
resistance toward the bottom....
you don't need to refill. I
suspect you are overthinking it.Â
I used to think HD8s use too much
oil until I realised they don't
need all that much to work
correctly.</div>
<div><br clear="none">
</div>
<div>Cheers,</div>
<div><br clear="none">
</div>
<div>Alan</div>
</div>
<br clear="none">
<div>
<div dir="ltr">On Thu, Jun 17, 2021
at 12:59 AM Roger Grace via
Healeys <<a rel="nofollow
noopener noreferrer noreferrer"
shape="rect"
href="mailto:healeys@autox.team.net";
target="_blank"
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br clear="none">
</div>
<blockquote style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>Ok have spoken to Joe who
was most helpful.<br
clear="none">
</div>
<div>We did some measurements
together over the phone and
established that my dampers
are correct.</div>
<div>He says that he has
encountered this before but
not sure of the reason.<br
clear="none">
</div>
<div>Suggests that I run the
dashpots dry then start again.</div>
<div>In meantime he will do more
research.</div>
<div>rg<br clear="none">
</div>
</div>
<div
id="m_4835443311576230233yiv9259953231m_-1209655407184456216gmail-m_-7533876899210611790DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br
clear="none">
</div>
</blockquote>
</div>
</div>
<br clear="none">
</blockquote>
<br>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</font></div>
</div>
</div>
</blockquote>
</div>
</blockquote>
<br>
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