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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'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>
<br>
<div class="moz-cite-prefix">On 3/18/2023 9:49 AM, Simon Lachlan via
Healeys wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">Hereâ??s a can of worms that we havenâ??t
delved into for a whileâ?¦.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p>Â </o:p></span></p>
<ol style="margin-top:0cm" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l0 level1 lfo1"><span
style="font-size:12.0pt;font-family:"Times New
Roman",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??<o:p></o:p></span></li>
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l0 level1 lfo1"><span
style="font-size:12.0pt;font-family:"Times New
Roman",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:12.0pt">Â but
that</span><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"> was dismissed fairly vigorously by
Jeremy Welch as being way OTT for normal road
use.<o:p></o:p></span></li>
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l0 level1 lfo1"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">And, I have 12,000 miles+++ as plug
replacement mileage so long as they still look and perform
OK. Any thoughts?<o:p></o:p></span></li>
</ol>
<p class="MsoListParagraph"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p>Â </o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">Thanks, Simon<o:p></o:p></span></p>
</div>
<br>
</blockquote>
<br>
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