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I do exactly what Bob does with my BT7 except I use a non-resistor plug =
=E2=80=93 Champion N12YC and 0.028=E2=80=9D 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 don=E2=80=99t 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.
=20
Mirek
=20
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
=20
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.=20
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:
Here=E2=80=99s a can of worms that we haven=E2=80=99t delved into for a =
while=E2=80=A6.
So, I=E2=80=99m 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.
=20
1. I was looking through my library of files on Healey topics and saw =
that we were all over the place on plug gaps=E2=80=A6..all the way up to =
0.035=E2=80=9D. So what=E2=80=99s the opinion there??
2. And which plug? Seemed to be mostly between NGK=E2=80=99s BP6ES & =
BP5ES. Was a hold-out for their B8EGV 5627 but that was 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?
=20
Thanks, Simon
=20
=20
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link=3D"#0563C1" vlink=3D"#954F72" style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>I do exactly what Bob does =
with my BT7 except I use a non-resistor plug =E2=80=93 Champion N12YC =
and 0.028=E2=80=9D gap.=C2=A0 I too use a Lucas Sports coil. =C2=A0I =
always thought the resistor plugs were to introduced to supress =
interference with car radios, which I don=E2=80=99t have, but I am happy =
to be corrected on that.=C2=A0 =C2=A0I think plugs are unnecessarily =
changed too frequently.=C2=A0 I remove them once in a while (every few =
years) and clean and check the gaps.=C2=A0 I run them until they shows =
signs of deterioration.=C2=A0 I have never had a plug fail me in the =
Healey.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Mirek<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-CA'>From:</span></b><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-CA'> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Bob =
Spidell<br><b>Sent:</b> March 18, 2023 2:17 PM<br><b>To:</b> =
healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] =
Plugs<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>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 =
style=3D'mso-fareast-language:EN-CA'><o:p></o:p></span></p><div><p =
class=3DMsoNormal>On 3/18/2023 9:49 AM, Simon Lachlan via Healeys =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman ,serif",serif'>Here=E2=80=99s a can of worms that we =
haven=E2=80=99t delved into for a =
while=E2=80=A6.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman =
,serif",serif'>So, I=E2=80=99m 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><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman =
,serif",serif'> </span><o:p></o:p></p><ol style=3D'margin-top:0cm' =
start=3D1 type=3D1><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo3'><span =
style=3D'font-size:12.0pt;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 gaps=E2=80=A6..all the way up to =
0.035=E2=80=9D. So what=E2=80=99s the opinion =
there??</span><o:p></o:p></li><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo3'><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman =
,serif",serif'>And which plug? Seemed to be mostly between NGK=E2=80=99s =
BP6ES & BP5ES. Was a hold-out for their B8EGV 5627</span><span =
style=3D'font-size:12.0pt'> but that</span><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman ,serif",serif'> =
was dismissed fairly vigorously by Jeremy Welch as being way OTT for =
normal road use.</span><o:p></o:p></li><li class=3DMsoListParagraph =
style=3D'margin-left:0cm;mso-list:l0 level1 lfo3'><span =
style=3D'font-size:12.0pt;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><o:p></o:p></li></ol><p class=3DMsoListParagraph><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman =
,serif",serif'> </span><o:p></o:p></p><p =
class=3DMsoListParagraph><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman =
,serif",serif'>Thanks, Simon</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-CA'><o:p> </o:p></span></p></blockq=
uote><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-CA'><o:p> </o:p></span></p></div></=
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