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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
>
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<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>
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