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I suspect, but don't know for a fact, that resistor plugs limit some of
the /current/ to the plug, and may somewhat reduce erosion of the
terminals. The voltage drop across the resistor is inconsequential
compared to the voltage required to jump the gap. Non-resistor plugs do
produce a hotter spark.
https://www.championautoparts.com/Technical/Tech-Tips/decoding-champion-spark-plugs.html
On 3/19/2023 6:52 AM, Michael Oritt wrote:
> "I always thought the resistor plugs were to introduced to suppress
> interference with car radios, which I donâ??t have,"
> -----------------------------------------------------
> They also eliminate your ignition's noise in nearby vehicles.
>
> Best--Michael Oritt
>
>
> On Sun, Mar 19, 2023 at 8:11â?¯AM m.g.sharp--- via Healeys
> <healeys@autox.team.net> wrote:
>
> I do exactly what Bob does with my BT7 except I use a non-resistor
> plug â?? Champion N12YC and 0.028â?? gap. I too use a Lucas Sports
> coil. I always thought the resistor plugs were to introduced to
> supress interference with car radios, which I donâ??t have, but I am
> happy to be corrected on that.  I think plugs are unnecessarily
> changed too frequently. I remove them once in a while (every few
> years) and clean and check the gaps. I run them until they shows
> signs of deterioration. I have never had a plug fail me in the
> Healey.
>
> Mirek
>
> *From:*Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Bob
> Spidell
> *Sent:* March 18, 2023 2:17 PM
> *To:* healeys@autox.team.net
> *Subject:* Re: [Healeys] Plugs
>
> I've run over 150K miles on Champion plugs with nary an issue (and
> will continue to do so); RN12YC for the BJ8 and whatever the
> recommended is for a 100M (RN10C?). With Pertronix Ignitors in
> both, I run slightly over 'book' value (0.025") at 0.028" and both
> run very well (I also run stranded copper wire secondaries, so the
> 'R' is important, plus the plug caps have a resistor in them as
> well). My one-time auto shop teacher father maintained whatever
> spark was sufficient to ignite the mixture was adequate--mixture
> and compression took it from there--but a larger gap induces a
> 'hotter' spark which may be beneficial with leaner mixtures and at
> higher engine RPM (but has less margin as the electrode erodes). A
> larger gap requires the coil to produce more secondary voltage to
> jump the gap; a sports coil may be required to produce a
> consistent spark. 12K miles on plugs is fine in my experience--as
> long as the engine is in good nick--and they can be cleaned and
> re-gapped at least once. Sandblasting is a no-no as it will pit
> the ceramic insulator and can cause issues.
>
> I came across a YouTube video by David Vizard where he claims E3
> Diamond 'Split Fire' plugs produced slightly better mileage; yep,
> E3 makes a plug for Big Healeys (6-cyl only, I think). I've heard
> rumors that counterfeit NGK plugs are in the market.
>
>
> On 3/18/2023 9:49 AM, Simon Lachlan via Healeys wrote:
>
> Hereâ??s a can of worms that we havenâ??t delved into for a whileâ?¦.
>
> So, Iâ??m trying to get all my ducks in a row for a short run
> abroad. Car is a MkII BT7 with a DW fast road cam, 3 HD6s, big
> bore 6 branch and 123Ignition plus a so-called Sports Coil.
>
> 1. I was looking through my library of files on Healey topics
> and saw that we were all over the place on plug gapsâ?¦..all
> the way up to 0.035â??. So whatâ??s the opinion there??
> 2. And which plug? Seemed to be mostly between NGKâ??s BP6ES &
> BP5ES. Was a hold-out for their B8EGV 5627Â but thatwas
> dismissed fairly vigorously by Jeremy Welch as being way
> OTT for normal road use.
> 3. And, I have 12,000 miles+++ as plug replacement mileage so
> long as they still look and perform OK. Any thoughts?
>
> Thanks, Simon
>
>
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I suspect, but don't know for a fact, that resistor plugs limit some
of the <i>current</i> to the plug, and may somewhat reduce erosion
of the terminals. The voltage drop across the resistor is
inconsequential compared to the voltage required to jump the gap.
Non-resistor plugs do produce a hotter spark.<br>
<br>
<a class="moz-txt-link-freetext"
href="https://www.championautoparts.com/Technical/Tech-Tips/decoding-champion-spark-plugs.html";>https://www.championautoparts.com/Technical/Tech-Tips/decoding-champion-spark-plugs.html</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 3/19/2023 6:52 AM, Michael Oritt
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPTa0B4d9zNT-K9RtCorKiYdoL_w4fP5S3PkMRXuPVKiDUtSYA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default" style="color:#3333ff"><span
style="color:rgb(34,34,34)">"I always thought the resistor
plugs were to introduced to suppress interference with car
radios, which I donâ??t have,"</span><br>
</div>
<div class="gmail_default" style="color:#3333ff"><span
style="color:rgb(34,34,34)">-----------------------------------------------------</span></div>
<div class="gmail_default" style="color:#3333ff"><span
style="color:rgb(34,34,34)">They also eliminate your
ignition's noise in nearby vehicles.</span></div>
<div class="gmail_default" style="color:#3333ff"><span
style="color:rgb(34,34,34)"><br>
</span></div>
<div class="gmail_default" style="color:#3333ff"><span
style="color:rgb(34,34,34)">Best--Michael Oritt</span></div>
<div class="gmail_default" style="color:#3333ff"><span
style="color:rgb(34,34,34)"><br>
</span></div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Mar 19, 2023 at
8:11â?¯AM m.g.sharp--- via Healeys <<a
href="mailto:healeys@autox.team.net"; moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div class="msg4506245762485897014">
<div style="overflow-wrap: break-word;" lang="EN-CA">
<div class="m_4506245762485897014WordSection1">
<p class="MsoNormal">I do exactly what Bob does with my
BT7 except I use a non-resistor plug â?? Champion N12YC
and 0.028â?? gap. I too use a Lucas Sports coil. I
always thought the resistor plugs were to introduced
to supress interference with car radios, which I donâ??t
have, but I am happy to be corrected on that.  I
think plugs are unnecessarily changed too frequently.Â
I remove them once in a while (every few years) and
clean and check the gaps. I run them until they shows
signs of deterioration. I have never had a plug fail
me in the Healey.</p>
<p class="MsoNormal">Â </p>
<p class="MsoNormal">Mirek</p>
<p class="MsoNormal">Â </p>
<div>
<div
style="border-right:none;border-bottom:none;border-left:none;border-top:1pt
solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class="MsoNormal"><b><span
lang="EN-US">From:</span></b><span
lang="EN-US"> Healeys <<a
href="mailto:healeys-bounces@autox.team.net";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">healeys-bounces@autox.team.net</a>>
<b>On Behalf Of </b>Bob Spidell<br>
<b>Sent:</b> March 18, 2023 2:17 PM<br>
<b>To:</b> <a
href="mailto:healeys@autox.team.net";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a><br>
<b>Subject:</b> Re: [Healeys] Plugs</span></p>
</div>
</div>
<p class="MsoNormal">Â </p>
<p class="MsoNormal" style="margin-bottom:12pt">I've run
over 150K miles on Champion plugs with nary an issue
(and will continue to do so); RN12YC for the BJ8 and
whatever the recommended is for a 100M (RN10C?). With
Pertronix Ignitors in both, I run slightly over 'book'
value (0.025") at 0.028" and both run very well (I
also run stranded copper wire secondaries, so the 'R'
is important, plus the plug caps have a resistor in
them as well). My one-time auto shop teacher father
maintained whatever spark was sufficient to ignite the
mixture was adequate--mixture and compression took it
from there--but a larger gap induces a 'hotter' spark
which may be beneficial with leaner mixtures and at
higher engine RPM (but has less margin as the
electrode erodes). A larger gap requires the coil to
produce more secondary voltage to jump the gap; a
sports coil may be required to produce a consistent
spark. 12K miles on plugs is fine in my experience--as
long as the engine is in good nick--and they can be
cleaned and re-gapped at least once. Sandblasting is a
no-no as it will pit the ceramic insulator and can
cause issues. <br>
<br>
I came across a YouTube video by David Vizard where he
claims E3 Diamond 'Split Fire' plugs produced slightly
better mileage; yep, E3 makes a plug for Big Healeys
(6-cyl only, I think). I've heard rumors that
counterfeit NGK plugs are in the market.<br>
<br>
<br>
<span></span></p>
<div>
<p class="MsoNormal">On 3/18/2023 9:49 AM, Simon
Lachlan via Healeys wrote:</p>
</div>
<blockquote style="margin-top:5pt;margin-bottom:5pt">
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Times New
Roman ,serif",serif">Hereâ??s a can of worms
that we havenâ??t delved into for a whileâ?¦.</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Times New
Roman ,serif",serif">So, Iâ??m trying to get
all my ducks in a row for a short run abroad. Car
is a MkII BT7 with a DW fast road cam, 3 HD6s, big
bore 6 branch and 123Ignition plus a so-called
Sports Coil.</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Times New
Roman ,serif",serif">Â </span></p>
<ol style="margin-top:0cm" type="1" start="1">
<li class="m_4506245762485897014MsoListParagraph"
style="margin-left:0cm"><span
style="font-size:12pt;font-family:"Times
New Roman ,serif",serif">I was looking
through my library of files on Healey topics and
saw that we were all over the place on plug
gapsâ?¦..all the way up to 0.035â??. So whatâ??s the
opinion there??</span></li>
<li class="m_4506245762485897014MsoListParagraph"
style="margin-left:0cm"><span
style="font-size:12pt;font-family:"Times
New Roman ,serif",serif">And which plug?
Seemed to be mostly between NGKâ??s BP6ES &
BP5ES. Was a hold-out for their B8EGV 5627</span><span
style="font-size:12pt">Â but that</span><span
style="font-size:12pt;font-family:"Times
New Roman ,serif",serif"> was dismissed
fairly vigorously by Jeremy Welch as being way
OTT for normal road use.</span></li>
<li class="m_4506245762485897014MsoListParagraph"
style="margin-left:0cm"><span
style="font-size:12pt;font-family:"Times
New Roman ,serif",serif">And, I have 12,000
miles+++ as plug replacement mileage so long as
they still look and perform OK. Any
thoughts?</span></li>
</ol>
<p class="m_4506245762485897014MsoListParagraph"><span
style="font-size:12pt;font-family:"Times New
Roman ,serif",serif">Â </span></p>
<p class="m_4506245762485897014MsoListParagraph"><span
style="font-size:12pt;font-family:"Times New
Roman ,serif",serif">Thanks, Simon</span></p>
<p class="MsoNormal"><span>Â </span></p>
</blockquote>
<p class="MsoNormal"><span>Â </span></p>
</div>
</div>
<br>
</div>
</blockquote>
</div>
</blockquote>
<br>
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