[Healeys] Plugs

[Michael Oritt]

"I always thought the resistor plugs were to introduced to suppress
interference with car radios, which I don’t have,"
-----------------------------------------------------
They also eliminate your ignition's noise in nearby vehicles.

Best--Michael Oritt


On Sun, Mar 19, 2023 at 8:11 AM m.g.sharp--- via Healeys <
healeys at autox.team.net> wrote:

> I do exactly what Bob does with my BT7 except I use a non-resistor plug –
> Champion N12YC and 0.028” 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’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 at autox.team.net> *On Behalf Of *Bob
> Spidell
> *Sent:* March 18, 2023 2:17 PM
> *To:* healeys at 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:
>
> Here’s a can of worms that we haven’t delved into for a while….
>
> So, I’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 gaps…..all the way up to 0.035”. So
>    what’s the opinion there??
>    2. And which plug? Seemed to be mostly between NGK’s 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?
>
>
>
> Thanks, Simon
>
>
>
>
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