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But that membrane is part of the jet if I am not mistaken. Nothing to do
with the needle.
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.
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.
In our more modern daily cars (my newest car is from 2007) I did not
encounter any problems either.
Kees Oudesluijs
Op 7-5-2023 om 15:29 schreef josef-eckert@t-online.de:
>
> Kees,
>
> SU HD-carbs have diaphragms, better membranes. The membranes
> eventually crack and break after
>
> many years of usage. But that depends very much on the type of fuel used.
> A friend of mine went on a larger tour of Scandinavia with his Jaguar
> XJ6 a few years ago and
> filled up with the E10+ fuel that is common there in Sweden. That was
> fatal for the
> carburetor membranes and also for the fuel pumps. When trying to
> restart after the Winter
> break, nothing worked on the car. Carburetters, starter (choke) carb,
> fuel piumps, all membranes werebroken and shot.
>
> Josef
>
> -----Original-Nachricht-----
>
> Betreff: Re: [Healeys] HD6 jets
>
> Datum: 2023-05-07T14:46:58+0200
>
> Von: "Kees Oudesluijs via Healeys" <healeys@autox.team.net>
>
> An: "healeys@autox.team.net" <healeys@autox.team.net>
>
> SU and diaphragms????
>
> May be meant for Stromberg carbs?
>
> 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.
>
> Kees Oudesluijs
>
> Op 7-5-2023 om 10:57 schreef Simon Lachlan via Healeys:
>
> I was a bit startled by something I read the other day. It was to
> the effect that itâ??s sensible to change the jets in HD carbs every
> 5 years because the diaphragms harden and leak. Every 5 years?
>
> Mine have been in since 2011â?¦â?¦â?¦â?¦Iâ??ve 3, so itâ??ll be quite a
> business.
>
> Another topicâ?¦my copy of Rogerâ??s book has arrived. Excellent.
> Anyhow, the front coverâ?¦..where was that taken?
>
> Simon
>
>
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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.=C2=A0 <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=3D"moz-cite-prefix">Op 7-5-2023 om 15:29 schreef
<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:josef-eckert@t-o=
nline.de">josef-eckert@t-online.de</a>:<br>
</div>
<blockquote type=3D"cite"
cite=3D"mid:1683466145328.171459.9d6f4d79277d3a92b5b650374278e27d061de689@s=
pica.telekom.de">
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF=
-8">
<title></title>
<p style=3D"margin: 0px;"><span
style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:#00000=
0;text-decoration:none">Kees,<br>
</span></p>
<p style=3D"margin: 0px;"><span
style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:#00000=
0;text-decoration:none">SU
HD-carbs have diaphragms, better membranes. </span><span
class=3D"Y2IQFc" lang=3D"en">The membranes eventually crack and
break after </span></p>
<p style=3D"margin: 0px;"><span class=3D"Y2IQFc" lang=3D"en">many yea=
rs
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=3D"margin: 0px;">=C2=A0</p>
<p style=3D"margin: 0px;"><span class=3D"Y2IQFc" lang=3D"en">Josef</s=
pan></p>
<p style=3D"margin: 0px;">=C2=A0</p>
<p style=3D"margin: 0px;"><span
style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:#00000=
0;text-decoration:none">=C2=A0</span></p>
<p style=3D"margin: 0px;">=C2=A0</p>
<p style=3D"margin: 0px;">=C2=A0</p>
<p style=3D"margin: 0px;">-----Original-Nachricht-----</p>
<p style=3D"margin: 0px;">Betreff: Re: [Healeys] HD6 jets</p>
<p style=3D"margin: 0px;">Datum: 2023-05-07T14:46:58+0200</p>
<p style=3D"margin: 0px;">Von: "Kees Oudesluijs via Healeys"
<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:healeys@autox.tea=
m.net"><healeys@autox.team.net></a></p>
<p style=3D"margin: 0px;">An: <a class=3D"moz-txt-link-rfc2396E" href=
=3D"mailto:healeys@autox.team.net";>"healeys@autox.team.net"</a>
<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:healeys@autox.tea=
m.net"><healeys@autox.team.net></a></p>
<p style=3D"margin: 0px;">=C2=A0</p>
<p style=3D"margin: 0px;">=C2=A0</p>
<p style=3D"margin: 0px;">=C2=A0</p>
<div style=3D"position: relative; color: #000000; font: 12px
Arial,Helvetica,sans-serif;">
<p style=3D"margin: 0px;">SU and diaphragms???? </p>
<p style=3D"margin: 0px;">May be meant for Stromberg carbs? </p>
<p style=3D"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=3D"margin: 0px;">Kees Oudesluijs</p>
<p style=3D"margin: 0px;">=C2=A0</p>
<p style=3D"margin: 0px;">=C2=A0</p>
<div class=3D"moz-cite-prefix">Op 7-5-2023 om 10:57 schreef Simon
Lachlan via Healeys:</div>
<blockquote
cite=3D"mid:000001d980c1$ec143110$c43c9330$@alexarevel.plus.com">=
<div class=3D"WordSection1">
<p class=3D"MsoNormal">I was a bit startled by something I
read the other day. It was to the effect that it=E2=80=99s
sensible to change the jets in HD carbs every 5 years
because the diaphragms harden and leak. Every 5 years?</p>
<p class=3D"MsoNormal">Mine have been in since 2011=E2=80=A6=E2=
=80=A6=E2=80=A6=E2=80=A6I=E2=80=99ve 3,
so it=E2=80=99ll be quite a business.</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Another topic=E2=80=A6my copy of Roger=
=E2=80=99s book
has arrived. Excellent. Anyhow, the front cover=E2=80=A6..whe=
re
was that taken?</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Simon</p>
</div>
<br>
<fieldset class=3D"moz-mime-attachment-header"></fieldset>
<pre class=3D"moz-quote-pre">____________________________________=
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