[Healeys] Plugs

Sat Apr 15 19:46:29 MDT 2023

I don’t think that HT RFI affects modern car radios, which are mostly FM, not AM.  Ditto with modern digital TV and other digital communications.

Back in the eighties when I attended race meetings on RNZAF (Royal New Zealand Air Force) bases we had to run resistive HT leads because solid-core affected avionics on the airfields.

Mark

Ardmore, NZ

From: Hank Leach <gradea1 at charter.net> 
Sent: Monday, 20 March 2023 9:54 AM
To: 'josef-eckert at t-online.de' <josef-eckert at t-online.de>
Cc: 'Michael Oritt' <michael.oritt at gmail.com>; 'm.g.sharp at sympatico.ca' <m.g.sharp at sympatico.ca>; 'healeys at autox.team.net' <healeys at autox.team.net>
Subject: Re: [Healeys] Plugs

I'm sure that only your neighbor gets pissed when you drive by their house with bumblebee wired Healeys and they also have an old tube type radio or TV.  Not sure that LED TVs or modern car radios are affected by engine noise, but all of it is RF so it might affect even your phone as well. Hank

-----------------------------------------

From: "josef-eckert--- via Healeys" 
To: "Michael Oritt", "m.g.sharp at sympatico.ca <mailto:m.g.sharp at sympatico.ca> "
Cc: "healeys at autox.team.net <mailto:healeys at autox.team.net> "
Sent: Sunday March 19 2023 7:44:23AM
Subject: Re: [Healeys] Plugs

I do not care what kind of noices are in nearby vehicles.

-----Original-Nachricht-----

Betreff: Re: [Healeys] Plugs

Datum: 2023-03-19T15:15:37+0100

Von: "Michael Oritt" <michael.oritt at gmail.com <mailto:michael.oritt at gmail.com> >

An: "m.g.sharp at sympatico.ca <mailto:m.g.sharp at sympatico.ca> " <m.g.sharp at sympatico.ca <mailto:m.g.sharp at sympatico.ca> >

"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 <mailto: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 <mailto:healeys-bounces at autox.team.net> > On Behalf Of Bob Spidell
Sent: March 18, 2023 2:17 PM
To: healeys at autox.team.net <mailto: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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