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Thanks guys for the great info, the power of the list is amazing. Kees, yo=
u want to sell me three of those transils? Saves me from poking around on e=
bay.Thanks againRay
On Tuesday, October 20, 2020, 9:17:57 AM PDT, Kees Oudesluijs via Heale=
ys <healeys@autox.team.net> wrote: =20
=20
=20
Bob,=20
=20
=20
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 s=
mall screw that holds the points blade and one of the bigger screws that fi=
x 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 wit=
h the points, a transil or capacitor is fitted over the points.
=20
=20
Kees Oudesluijs
=20
Op 20-10-2020 om 17:18 schreef Bob Spidell:
=20
=20
The late Dave DuBois, who designed the transistor-switch fix, quit doing t=
he conversions when he found the reduced voltage cross the points allowed t=
hem 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 luc=
k with them.
=20
I have a points/diode pump in my BN2 that works well, but I only have a fe=
w hundred miles in the car. I've lost track of what I've got in my BJ8.
=20
Bob
=20
On 10/19/2020 11:31 PM, Kees Oudesluijs via Healeys wrote:
=20
=20
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 redu=
ces the max voltage across the points to 18V instead of several hundreds wh=
en the contact is broken and the points spark.=20
=20
=20
It is also important to clean and polish the points using flower paper (2-3=
000 grid), also when new!!
=20
A transil is more or less a bi-directional Zener diode. They cost next to n=
othing. I buy them in bulk and pay about $0,15 but when buying only one exp=
ect=C2=A0 to pay between $1 and $5. Ebay is an excellent way to source tran=
sils (mainly from China).
=20
A transistor circuit similar to those used in early transistorised ignition=
systems does a similar job by limiting the current through the points
=20
=20
Kees Oudesluijs
=20
=20
=20
=20
Op 20-10-2020 om 07:50 schreef Ray Juncal via Healeys:
=20
=20
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 t=
he 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 t=
he conversion and new looking contact points. Thoughts, comments, suggestio=
ns.....
Regards Ray
=20
=20
=20
=20
=20
_______________________________________________Support Team.Net http://ww=
w.team.net/donate.htmlSuggested annual donation $12.75Archive: http://www.t=
eam.net/pipermail/healeys http://autox.team.net/archiveHealeys@autox.team.n=
ethttp://autox.team.net/mailman/listinfo/healeysUnsubscribe/Manage: http://=
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Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e
Healeys@autox.team.net
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@yahoo.com
=20
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<html><head></head><body><div class=3D"ydpfb364944yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px=
;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Thanks guys for the great in=
fo, the power of the list is amazing. Kees, you want to sell me three of th=
ose transils? Saves me from poking around on ebay.</div><div dir=3D"ltr" da=
ta-setdir=3D"false">Thanks again</div><div dir=3D"ltr" data-setdir=3D"false=
">Ray<br></div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div><br></=
div>
=20
</div><div id=3D"ydp58ac49f2yahoo_quoted_3754717868" class=3D"ydp58=
ac49f2yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Tuesday, October 20, 2020, 9:17:57 AM PDT, Kees Oude=
sluijs via Healeys <healeys@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydp58ac49f2yiv7447572965"><div>
<p>Bob, <br clear=3D"none">
</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 clear=3D"none">
</p>
<p>Kees Oudesluijs<br clear=3D"none">
</p>
<div class=3D"ydp58ac49f2yiv7447572965yqt9890308802" id=3D"ydp58ac49f2y=
iv7447572965yqtfd62082"><div class=3D"ydp58ac49f2yiv7447572965moz-cite-pref=
ix">Op 20-10-2020 om 17:18 schreef Bob
Spidell:<br clear=3D"none">
</div>
<blockquote type=3D"cite">
</blockquote></div></div><div class=3D"ydp58ac49f2yiv7447572965yqt989=
0308802" id=3D"ydp58ac49f2yiv7447572965yqtfd62469"><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=3D"non=
e">
<br clear=3D"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=3D"none">
<br clear=3D"none">
Bob<br clear=3D"none">
<br clear=3D"none">
<div class=3D"ydp58ac49f2yiv7447572965moz-cite-prefix">On 10/19/2020 =
11:31 PM, Kees
Oudesluijs via Healeys wrote:<br clear=3D"none">
</div>
<blockquote type=3D"cite">
</blockquote></div><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=3D"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 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 clear=3D"none">
</p>
<p>Kees Oudesluijs</p>
<p><br clear=3D"none">
</p>
<p><br clear=3D"none">
</p>
<div class=3D"ydp58ac49f2yiv7447572965moz-cite-prefix">Op 20-10-202=
0 om 07:50 schreef Ray
Juncal via Healeys:<br clear=3D"none">
</div>
<blockquote type=3D"cite">
</blockquote></div></div><div><div class=3D"ydp58ac49f2yiv7447572=
965yqt9890308802" id=3D"ydp58ac49f2yiv7447572965yqtfd48235"><div class=3D"y=
dp58ac49f2yiv7447572965yahoo-style-wrap" style=3D"font-family:Helvetica Neu=
e, Helvetica, Arial, sans-serif;font-size:16px;">
<div dir=3D"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=3D"none">
</div>
<div dir=3D"ltr">Regards</div>
<div dir=3D"ltr">Ray<br clear=3D"none">
</div>
</div>
<br clear=3D"none">
<br clear=3D"none">
=20
<br clear=3D"none">
=20
<br clear=3D"none">
<br clear=3D"none">
<fieldset class=3D"ydp58ac49f2yiv7447572965mimeAttachmentHeader"></fi=
eldset>
</div><pre class=3D"ydp58ac49f2yiv7447572965moz-quote-pre"><div class=
=3D"ydp58ac49f2yiv7447572965yqt9890308802" id=3D"ydp58ac49f2yiv7447572965yq=
tfd28340">_______________________________________________
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1">
</div></pre><div class=3D"ydp58ac49f2yiv7447572965yqt9890308802" id=3D"ydp5=
8ac49f2yiv7447572965yqtfd87113">
=20
</div></div></div><div class=3D"ydp58ac49f2yqt9890308802" id=3D"ydp58ac49=
f2yqtfd07401">_______________________________________________<br clear=3D"n=
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