This is a multi-part message in MIME format.
--===============7067453642680495303==
boundary="------------15F590F11B0BD2DADFE61535"
Content-Language: nl
This is a multi-part message in MIME format.
--------------15F590F11B0BD2DADFE61535
Content-Transfer-Encoding: 8bit
Bob,
Did you fit the transil in the same way the diode was fitted? If so this
is not correct. It should be fitted as the capacitor is fitted, between
the small screw that holds the points blade and one of the bigger screws
that fix the Bakelite bridge to the coil body. You can fit the transil
instead of the capacitor or parallel to the capacitor. A diode is fitted
in series with the points, a transil or capacitor is fitted over the points.
Kees Oudesluijs
Op 20-10-2020 om 17:18 schreef Bob Spidell:
> The late Dave DuBois, who designed the transistor-switch fix, quit
> doing the conversions when he found the reduced voltage cross the
> points allowed them to oxidize. I tried the transil fix, but didn't
> get much more longevity than a stock points setup with a diode; I do
> know some have had better luck with them.
>
> I have a points/diode pump in my BN2 that works well, but I only have
> a few hundred miles in the car. I've lost track of what I've got in my
> BJ8.
>
> Bob
>
> On 10/19/2020 11:31 PM, Kees Oudesluijs via Healeys wrote:
>>
>> When rebuilding SU electrical fuel pumps I ad a transil (e.g.. 1.5
>> KE18CA) over the points, parallel or in stead of the capacitor if
>> fitted. This reduces the max voltage across the points to 18V instead
>> of several hundreds when the contact is broken and the points spark.
>>
>> It is also important to clean and polish the points using flower
>> paper (2-3000 grid), also when new!!
>>
>> A transil is more or less a bi-directional Zener diode. They cost
>> next to nothing. I buy them in bulk and pay about $0,15 but when
>> buying only one expect to pay between $1 and $5. Ebay is an
>> excellent way to source transils (mainly from China).
>>
>> A transistor circuit similar to those used in early transistorised
>> ignition systems does a similar job by limiting the current through
>> the points
>>
>> Kees Oudesluijs
>>
>>
>>
>> Op 20-10-2020 om 07:50 schreef Ray Juncal via Healeys:
>>> I'm rebuilding a couple of early S. U. fuel pumps for my 100. In
>>> checking my reference files I came across an article from the MG
>>> club about adding a transistor circuit to reduce the amps across the
>>> points. That would keep the points from burning and extend the life
>>> of the points. Has anyone on the list tried this? The author of the
>>> article claims he has 20,000 miles on the conversion and new looking
>>> contact points. Thoughts, comments, suggestions.....
>>> Regards
>>> Ray
>>>
>>>
>>
>
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation $12.75
>
> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
>
> Healeys@autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/coudesluijs@chello.nl
>
--------------15F590F11B0BD2DADFE61535
Content-Transfer-Encoding: 8bit
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Bob, <br>
</p>
<p>Did you fit the transil in the same way the diode was fitted? If
so this is not correct. It should be fitted as the capacitor is
fitted, between the small screw that holds the points blade and
one of the bigger screws that fix the Bakelite bridge to the coil
body. You can fit the transil instead of the capacitor or parallel
to the capacitor. A diode is fitted in series with the points, a
transil or capacitor is fitted over the points.<br>
</p>
<p>Kees Oudesluijs<br>
</p>
<div class="moz-cite-prefix">Op 20-10-2020 om 17:18 schreef Bob
Spidell:<br>
</div>
<blockquote type="cite"
cite="mid:c8d0ee37-49cd-9bd5-a3c2-1ceb87ae51aa@comcast.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
The late Dave DuBois, who designed the transistor-switch fix, quit
doing the conversions when he found the reduced voltage cross the
points allowed them to oxidize. I tried the transil fix, but
didn't get much more longevity than a stock points setup with a
diode; I do know some have had better luck with them.<br>
<br>
I have a points/diode pump in my BN2 that works well, but I only
have a few hundred miles in the car. I've lost track of what I've
got in my BJ8.<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 10/19/2020 11:31 PM, Kees
Oudesluijs via Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:73d5d6ff-dfc0-b415-c04e-e18d66fab85d@chello.nl">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>When rebuilding SU electrical fuel pumps I ad a transil
(e.g.. 1.5 KE18CA) over the points, parallel or in stead of
the capacitor if fitted. This reduces the max voltage across
the points to 18V instead of several hundreds when the contact
is broken and the points spark. <br>
</p>
<p>It is also important to clean and polish the points using
flower paper (2-3000 grid), also when new!!</p>
<p>A transil is more or less a bi-directional Zener diode. They
cost next to nothing. I buy them in bulk and pay about $0,15
but when buying only one expect to pay between $1 and $5.
Ebay is an excellent way to source transils (mainly from
China).</p>
<p>A transistor circuit similar to those used in early
transistorised ignition systems does a similar job by limiting
the current through the points<br>
</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 20-10-2020 om 07:50 schreef Ray
Juncal via Healeys:<br>
</div>
<blockquote type="cite"
cite="mid:1394757800.1379256.1603173043489@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<div class="yahoo-style-wrap" style="font-family:Helvetica
Neue, Helvetica, Arial, sans-serif;font-size:16px;">
<div dir="ltr" data-setdir="false">I'm rebuilding a couple
of early S. U. fuel pumps for my 100. In checking my
reference files I came across an article from the MG club
about adding a transistor circuit to reduce the amps
across the points. That would keep the points from burning
and extend the life of the points. Has anyone on the list
tried this? The author of the article claims he has 20,000
miles on the conversion and new looking contact points.
Thoughts, comments, suggestions.....<br>
</div>
<div dir="ltr" data-setdir="false">Regards</div>
<div dir="ltr" data-setdir="false">Ray<br>
</div>
</div>
<br>
<br>
</blockquote>
<br>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/healeys";>http://www.team.net/pipermail/healeys</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/archive";>http://autox.team.net/archive</a>
<a class="moz-txt-link-abbreviated"
href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
</pre>
</blockquote>
</body>
</html>
--------------15F590F11B0BD2DADFE61535--
--===============7067453642680495303==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============7067453642680495303==--
|