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<p>But that membrane is part of the jet if I am not mistaken.
Nothing to do with the needle.<br>
<br>
About the fuel: I have used E5, E10 and E15 for many years in a
variety of (classic) cars. E15 was available here for more than 20
years until all fuel became E10 some years ago. I have used E15 in
my J-H without any problems in the steel petrol tank (winter
storage), SU AUF301 fuel pump, DellOrto carbs of any metal or
rubber fuel lines/hoses. Rubber parts/hoses have to be renewed
once in a while, that was the case 50 years ago and it is no
different today. However I do not know the intervals. My SU pump
still has the original diaphragm that is now over 50 years old but
I replaced the valve seals and the cork membrane under the large
domed cover in 2008. The cork membrane may perhaps be the only
part that is not compatible with E5/10/15 as I have seen a fair
amount of these failing. If it needs attention in the future I
would probably replace that with PET cut from some suitably shaped
bottle. <br>
</p>
<p>I rebuild the carbs in 2008 and at the same time replaced the 50
years old rubber petrol hoses and the hoses are still supple and
crack free. I have had no problems with E10 or E15 whatsoever,
being degradation of rubber parts, corrosion of aluminium
carb/pump parts, corrosion in the tank or separation of the fuel.
The only thing may have been an adjustment of the idling jets. <br>
</p>
<p>In our more modern daily cars (my newest car is from 2007) I did
not encounter any problems either.</p>
<p><br>
</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 7-5-2023 om 15:29 schreef
<a class="moz-txt-link-abbreviated" href="mailto:josef-eckert@t-online.de">josef-eckert@t-online.de</a>:<br>
</div>
<blockquote type="cite"
cite="mid:1683466145328.171459.9d6f4d79277d3a92b5b650374278e27d061de689@spica.telekom.de">
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<title></title>
<p style="margin: 0px;"><span
style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none">Kees,<br>
</span></p>
<p style="margin: 0px;"><span
style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none">SU
HD-carbs have diaphragms, better membranes. </span><span
class="Y2IQFc" lang="en">The membranes eventually crack and
break after </span></p>
<p style="margin: 0px;"><span class="Y2IQFc" lang="en">many years
of usage. But that depends very much on the type of fuel used.
<br>
A friend of mine went on a larger tour of Scandinavia with his
Jaguar XJ6 a few years ago and <br>
filled up with the E10+ fuel that is common there in Sweden.
That was fatal for the <br>
carburetor membranes and also for the fuel pumps. When trying
to restart after the Winter <br>
break, nothing worked on the car. Carburetters, starter
(choke) carb, fuel piumps, all membranes werebroken and shot.<br>
</span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span class="Y2IQFc" lang="en">Josef</span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span
style="font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;text-decoration:none"> </span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;">-----Original-Nachricht-----</p>
<p style="margin: 0px;">Betreff: Re: [Healeys] HD6 jets</p>
<p style="margin: 0px;">Datum: 2023-05-07T14:46:58+0200</p>
<p style="margin: 0px;">Von: "Kees Oudesluijs via Healeys"
<a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a></p>
<p style="margin: 0px;">An: <a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net">"healeys@autox.team.net"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"> </p>
<div style="position: relative; color: #000000; font: 12px
Arial,Helvetica,sans-serif;">
<p style="margin: 0px;">SU and diaphragms???? </p>
<p style="margin: 0px;">May be meant for Stromberg carbs? </p>
<p style="margin: 0px;">The needle in SU's is not in contact
with the jet so if the carbs are set up properly the needles
don't wear.</p>
<p style="margin: 0px;">Kees Oudesluijs</p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"> </p>
<div class="moz-cite-prefix">Op 7-5-2023 om 10:57 schreef Simon
Lachlan via Healeys:</div>
<blockquote
cite="mid:000001d980c1$ec143110$c43c9330$@alexarevel.plus.com">
<div class="WordSection1">
<p class="MsoNormal">I was a bit startled by something I
read the other day. It was to the effect that it’s
sensible to change the jets in HD carbs every 5 years
because the diaphragms harden and leak. Every 5 years?</p>
<p class="MsoNormal">Mine have been in since 2011…………I’ve 3,
so it’ll be quite a business.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Another topic…my copy of Roger’s book
has arrived. Excellent. Anyhow, the front cover…..where
was that taken?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Simon</p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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