[Healeys] Plugs

Sun Mar 19 14:54:03 MDT 2023

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"
Cc: "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"  

	An: "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  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  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. 

	* 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??
 	* 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.
 	* 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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