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When properly fitted and adjusted the points in the SU pump do slide
over each other.
Kees Oudesluijs
Op 20-10-2020 om 23:00 schreef jim via Healeys:
>
> Yep, the Bell System (think telephones)Â ago found that "some" current
> flow was necessary to break-down the oxidization
> unless the contacts were arranged to wipe or slide across each other
> when operating..one solution was mercury wetted contacts
>
> Jim
>
>
>
> On Tuesday, October 20, 2020, 8:19:36 AM PDT, Bob Spidell
> <bspidell@comcast.net> wrote:
>
>
> 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
>
>
>
>
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<p>When properly fitted and adjusted the points in the SU pump do
slide over each other.</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 20-10-2020 om 23:00 schreef jim via
Healeys:<br>
</div>
<blockquote type="cite"
cite="mid:536389119.1183235.1603227652354@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="ydpf7390cecyahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;">
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">Yep, the Bell System (think
telephones)Â ago found that "some" current flow was necessary
to break-down the oxidization</div>
<div dir="ltr" data-setdir="false">unless the contacts were
arranged to wipe or slide across each other when
operating..one solution was mercury wetted contacts<br>
</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">Jim<br>
</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false"><br>
</div>
</div>
<div id="ydp44509694yahoo_quoted_3415853370"
class="ydp44509694yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<div> On Tuesday, October 20, 2020, 8:19:36 AM PDT, Bob
Spidell <a class="moz-txt-link-rfc2396E"
href="mailto:bspidell@comcast.net";><bspidell@comcast.net></a> wrote:
</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div id="ydp44509694yiv4758235383">
<div> 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
clear="none">
<br clear="none">
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 clear="none">
<br clear="none">
Bob<br clear="none">
<br clear="none">
<div class="ydp44509694yiv4758235383yqt3136047398"
id="ydp44509694yiv4758235383yqtfd05758">
<div class="ydp44509694yiv4758235383moz-cite-prefix">On
10/19/2020 11:31 PM, Kees Oudesluijs via Healeys
wrote:<br clear="none">
</div>
<blockquote type="cite"> </blockquote>
</div>
</div>
<div class="ydp44509694yiv4758235383yqt3136047398"
id="ydp44509694yiv4758235383yqtfd01922">
<div>
<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 clear="none">
</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 expectÂ
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
clear="none">
</p>
<p>Kees Oudesluijs</p>
<p><br clear="none">
</p>
<p><br clear="none">
</p>
<div class="ydp44509694yiv4758235383moz-cite-prefix">Op
20-10-2020 om 07:50 schreef Ray Juncal via Healeys:<br
clear="none">
</div>
<blockquote type="cite"> </blockquote>
</div>
<div>
<div class="ydp44509694yiv4758235383yahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:16px;">
<div dir="ltr">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
clear="none">
</div>
<div dir="ltr">Regards</div>
<div dir="ltr">Ray<br clear="none">
</div>
</div>
<br clear="none">
<br clear="none">
<br clear="none">
<br clear="none">
</div>
</div>
</div>
<div class="ydp44509694yqt3136047398"
id="ydp44509694yqtfd54625">_______________________________________________<br
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<pre class="moz-quote-pre"
wrap="">_______________________________________________
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