Subject: Re: [Healeys] Spark Plugs

From: Bob Haskell <[email-masked]>
Date: Mon, 1 Feb 2021 06:25:41 -0500

Bob,

Looks like NA8 were replaced by N5C.  But if you're looking for originality:

https://www.ebay.com/itm/3-NOS-Champion-NA8-Black-Body-Spark-Plugs-Austin-Healey-100-4-Jaguar-XK120-MG-TD/393094267661

Cheers,

Bob Haskell
Austin Healey 3000 BN7/BT7 registrar

On 1/31/21 6:48 PM, Bob Spidell wrote:
> We are running Champion N3C in our BN2; they work well.
>
> The shop manual calls for Champion NA.8 (whatever those are):
>
>
>
> On 1/27/2021 1:16 PM, Michael MacLean wrote:
>> Not to get too far off the subject about Healeys, but my Harley 
>> Davidson (30s technology like our cars) runs the best on the cheapest 
>> Ford Autolite 4164 copper plugs.  I tried "high performance" plugs 
>> from Harley Davidson and saw no difference.  Best of all they are 
>> only 89 cents a piece when on sale and I only need two at a time.  
>> Does anyone know for sure which Champion plug works for the BN2?
>> Mike MacLean
>>
>> On Wednesday, January 27, 2021, 10:18:57 AM PST, Kees Oudesluijs 
>> <[email-masked]> wrote:
>>
>>
>> Never had much problems with trouble because of plugs on any of my 
>> vehicles in the past 55 years. The only thing that is more or less 
>> important is to gap them, clean them once in a while and replace when 
>> they are to far gone. I do not think I even did that in the last ten 
>> years or so. I have nearly always used Champion plugs as they are 
>> very cheap: between €8 and €15 for four.
>>
>> I presume that electronic ignition (Pertronix in my case) may also help.
>>
>> Kees Oudesluijs
>>
>>
>> Op 27-1-2021 om 18:27 schreef Laurie Wilford:
>> I continue to use only Champion plugs in my Healeys but have 
>> experienced at least two episodes of plug problems over the years. 
>> Based on the number of miles covered that is probably not too bad, 
>> but the second time was with a newly installed set of plugs. One was 
>> defective.
>> Both times the symptoms were intermittent missing both at idle and on 
>> the highway.  Finally changing plugs was of course one of the last 
>> things I did.
>>
>> Laurie Wilford
>>
>> Sent from my Galaxy
>>
>>
>>
>
>
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---

From: Bob Spidell <[email-masked]>
Date: Mon, 1 Feb 2021 07:15:25 -0800

Yikes! $100/ea for spark plugs?

Where would I get a fourth? The 'NA' must stand for 'Not Available' ;)

On 2/1/2021 3:25 AM, Bob Haskell wrote:
>>> Davidson (30s technology like our cars) runs the best on the 
>>> cheapest Ford Autolite 4164 copper plugs.  I tried "high 
>>> performance" plugs from Harley Davidson and saw no difference.  Best 
>>> of all they are only 89 cents a piece when on sale and I only need 
>>> two at a time.  Does anyone know for sure which Champion plug works 
>>> for the BN2?
>>> Mike MacLean
>>>
>>> important is to gap them, clean them once in a while and replace 
>>> when they are to far gone. I do not think I even did that in the 
>>> last ten years or so. I have nearly always used Champion plugs as 
>>> they are very cheap: between €8 and €15 for four.
>>>
>>> Both times the symptoms were intermittent missing both at idle and 
>>> on the highway.  Finally changing plugs was of course one of the 
>>> last things I did.
>>>
>>> Laurie Wilford
>>>
>>> Sent from my Galaxy
>>>
>>>
>>>
>>
>>
>> Unsubscribe/Manage: 
>> http://autox.team.net/mailman/options/healeys/[email-masked]
>>
>

[email-masked]

---

From: Michael Salter <[email-masked]>
Date: Mon, 1 Feb 2021 10:33:17 -0500

--00000000000054b56805ba48139b

--00000000000054b56605ba481399
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Just to future complicate the issue there are at least 4 types of NA8
Champion plugs.
M

On Mon., Feb. 1, 2021, 10:24 a.m. Bob Spidell, <[email-masked]> wrote=
:

> https://www.ebay.com/itm/3-NOS-Champion-NA8-Black-Body-Spark-Plugs-Austin=
-Healey-100-4-Jaguar-XK120-MG-TD/393094267661
> >>> they are very cheap: between =E2=82=AC8 and =E2=82=AC15 for four.
> >>>
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>

--00000000000054b56605ba481399
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Just to future complicate the issue there are at least 4 =
types of NA8 Champion plugs.<div dir=3D"auto">M</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon., Feb. 1, 202=
1, 10:24 a.m. Bob Spidell, &lt;<a href=3D"mailto:[email-masked]">bspi=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yik=
es! $100/ea for spark plugs?<br>
<br>
Where would I get a fourth? The &#39;NA&#39; must stand for &#39;Not Availa=
ble&#39; ;)<br>
<br>
<br>
<br>
On 2/1/2021 3:25 AM, Bob Haskell wrote:<br>
&gt; Bob,<br>
&gt;<br>
&gt; Looks like NA8 were replaced by N5C.=C2=A0 But if you&#39;re looking f=
or <br>
&gt; originality:<br>
&gt;<br>
&gt; <a href=3D"https://www.ebay.com/itm/3-NOS-Champion-NA8-Black-Body-Spar=
k-Plugs-Austin-Healey-100-4-Jaguar-XK120-MG-TD/393094267661" rel=3D"norefer=
rer noreferrer" target=3D"_blank">https://www.ebay.com/itm/3-NOS-Champion-N=
A8-Black-Body-Spark-Plugs-Austin-Healey-100-4-Jaguar-XK120-MG-TD/3930942676=
61</a> <br>
&gt;<br>
&gt;<br>
&gt; Cheers,<br>
&gt;<br>
&gt; Bob Haskell<br>
&gt; Austin Healey 3000 BN7/BT7 registrar<br>
&gt;<br>
&gt; On 1/31/21 6:48 PM, Bob Spidell wrote:<br>
&gt;&gt; We are running Champion N3C in our BN2; they work well.<br>
&gt;&gt;<br>
&gt;&gt; The shop manual calls for Champion NA.8 (whatever those are):<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; On 1/27/2021 1:16 PM, Michael MacLean wrote:<br>
&gt;&gt;&gt; Not to get too far off the subject about Healeys, but my Harle=
y <br>
&gt;&gt;&gt; Davidson (30s technology like our cars) runs the best on the <=
br>
&gt;&gt;&gt; cheapest Ford Autolite 4164 copper plugs.=C2=A0 I tried &quot;=
high <br>
&gt;&gt;&gt; performance&quot; plugs from Harley Davidson and saw no differ=
ence.=C2=A0 Best <br>
&gt;&gt;&gt; of all they are only 89 cents a piece when on sale and I only =
need <br>
&gt;&gt;&gt; two at a time.=C2=A0 Does anyone know for sure which Champion =
plug works <br>
&gt;&gt;&gt; for the BN2?<br>
&gt;&gt;&gt; Mike MacLean<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; On Wednesday, January 27, 2021, 10:18:57 AM PST, Kees Oudeslui=
js <br>
&gt;&gt;&gt; &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank"=
 rel=3D"noreferrer">[email-masked]</a>&gt; wrote:<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Never had much problems with trouble because of plugs on any o=
f my <br>
&gt;&gt;&gt; vehicles in the past 55 years. The only thing that is more or =
less <br>
&gt;&gt;&gt; important is to gap them, clean them once in a while and repla=
ce <br>
&gt;&gt;&gt; when they are to far gone. I do not think I even did that in t=
he <br>
&gt;&gt;&gt; last ten years or so. I have nearly always used Champion plugs=
 as <br>
&gt;&gt;&gt; they are very cheap: between =E2=82=AC8 and =E2=82=AC15 for fo=
ur.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; I presume that electronic ignition (Pertronix in my case) may =
also <br>
&gt;&gt;&gt; help.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Kees Oudesluijs<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Op 27-1-2021 om 18:27 schreef Laurie Wilford:<br>
&gt;&gt;&gt; I continue to use only Champion plugs in my Healeys but have <=
br>
&gt;&gt;&gt; experienced at least two episodes of plug problems over the ye=
ars. <br>
&gt;&gt;&gt; Based on the number of miles covered that is probably not too =
bad, <br>
&gt;&gt;&gt; but the second time was with a newly installed set of plugs. O=
ne was <br>
&gt;&gt;&gt; defective.<br>
&gt;&gt;&gt; Both times the symptoms were intermittent missing both at idle=
 and <br>
&gt;&gt;&gt; on the highway.=C2=A0 Finally changing plugs was of course one=
 of the <br>
&gt;&gt;&gt; last things I did.<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Laurie Wilford<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt; Sent from my Galaxy<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; Support Team.Net <a href=3D"http://www.team.net/donate.html" rel=
=3D"noreferrer noreferrer" target=3D"_blank">http://www.team.net/donate.htm=
l</a><br>
&gt;&gt; Suggested annual donation=C2=A0 $12.75<br>
&gt;&gt;<br>
&gt;&gt; Archive: <a href=3D"http://www.team.net/pipermail/healeys" rel=3D"=
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eys</a> <br>
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rrer" target=3D"_blank">http://autox.team.net/archive</a><br>
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"noreferrer">[email-masked]</a><br>
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x.team.net/mailman/options/healeys/[email-masked]</a><br>
&gt;&gt;<br>
&gt;<br>
<br>
_______________________________________________<br>
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s/[email-masked]" rel=3D"noreferrer noreferrer" target=3D"_blank">=
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r>
<br>
</blockquote></div>

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[email-masked]

--00000000000054b56805ba48139b--

---

From: Bob Spidell <[email-masked]>
Date: Mon, 1 Feb 2021 07:51:50 -0800

Since we're on the topic--sorta, we now know what the 'official' plug 
recommendation was/is--what do the numbers mean? An N5C is a 'hotter' 
plug than an N3C, but what are the real world ramifications for, say, an 
old Healey 4-banger? As I mentioned, I have the N5C in my BN2, and they 
seem to work fine; presumably, they run hotter than the N3Cs, but what 
does that do for performance, etc.? I know hotter plugs are sometimes 
suggested for engines that burn a lot of oil, but do they cause the 
engine to run a bit hotter? What if I dropped an alloy head on my 100's 
engine, would I want to run a colder plug?

In aircraft piston engines that still run on heavily-leaded fuel, 
residual lead can foul plugs quickly; for problematic engines, a 'fine 
wire' plug is sometimes used (just like it sounds, these plugs have 
smaller center electrodes that are less likely to harbor unburned 
elemental lead).

[email-masked]

---

From: healeyguy--- via Healeys <[email-masked]>
Date: Mon, 1 Feb 2021 16:17:41 +0000 (UTC)

--===============8740453707341651655==
	boundary="----=_Part_1112608_618558974.1612196261309"

------=_Part_1112608_618558974.1612196261309
Content-Transfer-Encoding: quoted-printable

There is a lot of fudge room on the plugs. How many of our BN1 and 2's out =
there are still at factory specs. Our BN2 has nearly flat top pistons which=
 bump the compression, yours may have electronic ignition or=C2=A0 a specia=
l coil, cam, carbs of something else. Most likely a large number of the car=
s are not even tuned to get a clean burn. The plugs give you a reading on w=
hat is going on inside the combustion chamber. Sometimes a factory recommen=
dation is not the best choice.=C2=A0That said the N5C plugs in our BN2 seem=
 to work well.=C2=A0Perry

-----Original Message-----
From: Bob Spidell <[email-masked]>
To: Bob Haskell <[email-masked]>; [email-masked]
Sent: Mon, Feb 1, 2021 10:51 am
Subject: Re: [Healeys] Spark Plugs

Since we're on the topic--sorta, we now know what the 'official' plug=20
recommendation was/is--what do the numbers mean? An N5C is a 'hotter'=20
plug than an N3C, but what are the real world ramifications for, say, an=20
old Healey 4-banger? As I mentioned, I have the N5C in my BN2, and they=20
seem to work fine; presumably, they run hotter than the N3Cs, but what=20
does that do for performance, etc.? I know hotter plugs are sometimes=20
suggested for engines that burn a lot of oil, but do they cause the=20
engine to run a bit hotter? What if I dropped an alloy head on my 100's=20
engine, would I want to run a colder plug?

In aircraft piston engines that still run on heavily-leaded fuel,=20
residual lead can foul plugs quickly; for problematic engines, a 'fine=20
wire' plug is sometimes used (just like it sounds, these plugs have=20
smaller center electrodes that are less likely to harbor unburned=20
elemental lead).

On 2/1/2021 3:25 AM, Bob Haskell wrote:
> Bob,
>
> Looks like NA8 were replaced by N5C.=C2=A0 But if you're looking for=20
> originality:
>
-Healey-100-4-Jaguar-XK120-MG-TD/393094267661=20
>>> Not to get too far off the subject about Healeys, but my Harley=20
>>> Davidson (30s technology like our cars) runs the best on the=20
>>> cheapest Ford Autolite 4164 copper plugs.=C2=A0 I tried "high=20
>>> performance" plugs from Harley Davidson and saw no difference.=C2=A0 Be=
st=20
>>> of all they are only 89 cents a piece when on sale and I only need=20
>>> two at a time.=C2=A0 Does anyone know for sure which Champion plug work=
s=20
>>> for the BN2?
>>> Mike MacLean
>>>
>>> On Wednesday, January 27, 2021, 10:18:57 AM PST, Kees Oudesluijs=20
>>> Never had much problems with trouble because of plugs on any of my=20
>>> vehicles in the past 55 years. The only thing that is more or less=20
>>> important is to gap them, clean them once in a while and replace=20
>>> when they are to far gone. I do not think I even did that in the=20
>>> last ten years or so. I have nearly always used Champion plugs as=20
>>> I presume that electronic ignition (Pertronix in my case) may also=20
>>> help.
>>>
>>> Kees Oudesluijs
>>>
>>>
>>> I continue to use only Champion plugs in my Healeys but have=20
>>> experienced at least two episodes of plug problems over the years.=20
>>> Based on the number of miles covered that is probably not too bad,=20
>>> but the second time was with a newly installed set of plugs. One was=20
>>> defective.
>>> Both times the symptoms were intermittent missing both at idle and=20
>>> on the highway.=C2=A0 Finally changing plugs was of course one of the=
=20

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e

[email-masked]

@aol.com

------=_Part_1112608_618558974.1612196261309
Content-Transfer-Encoding: quoted-printable

<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">There i=
s a lot of fudge room on the plugs. How many of our BN1 and 2's out there a=
re still at factory specs. Our BN2 has nearly flat top pistons which bump t=
he compression, yours may have electronic ignition or&nbsp; a special coil,=
 cam, carbs of something else. Most likely a large number of the cars are n=
ot even tuned to get a clean burn. The plugs give you a reading on what is =
going on inside the combustion chamber. Sometimes a factory recommendation =
is not the best choice.&nbsp;
<div>That said the N5C plugs in our BN2 seem to work well.&nbsp;</div>

<div>Perry<br>
<br>
<br>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Bob Spidell &lt;[email-masked]&gt;<br>
To: Bob Haskell &lt;[email-masked]&gt;; [email-masked]<br>
Sent: Mon, Feb 1, 2021 10:51 am<br>
Subject: Re: [Healeys] Spark Plugs<br>
<br>

<div dir=3D"ltr">Since we're on the topic--sorta, we now know what the 'off=
icial' plug <br clear=3D"none">recommendation was/is--what do the numbers m=
ean? An N5C is a 'hotter' <br clear=3D"none">plug than an N3C, but what are=
 the real world ramifications for, say, an <br clear=3D"none">old Healey 4-=
banger? As I mentioned, I have the N5C in my BN2, and they <br clear=3D"non=
e">seem to work fine; presumably, they run hotter than the N3Cs, but what <=
br clear=3D"none">does that do for performance, etc.? I know hotter plugs a=
re sometimes <br clear=3D"none">suggested for engines that burn a lot of oi=
l, but do they cause the <br clear=3D"none">engine to run a bit hotter? Wha=
t if I dropped an alloy head on my 100's <br clear=3D"none">engine, would I=
 want to run a colder plug?<br clear=3D"none"><br clear=3D"none">In aircraf=
t piston engines that still run on heavily-leaded fuel, <br clear=3D"none">=
residual lead can foul plugs quickly; for problematic engines, a 'fine <br =
clear=3D"none">wire' plug is sometimes used (just like it sounds, these plu=
gs have <br clear=3D"none">smaller center electrodes that are less likely t=
o harbor unburned <br clear=3D"none">elemental lead).<br clear=3D"none"><br=
 clear=3D"none"><br clear=3D"none">
<div class=3D"yqt6611807189" id=3D"yqtfd46169"><br clear=3D"none">On 2/1/20=
21 3:25 AM, Bob Haskell wrote:<br clear=3D"none">&gt; Bob,<br clear=3D"none=
">&gt;<br clear=3D"none">&gt; Looks like NA8 were replaced by N5C.&nbsp; Bu=
t if you're looking for <br clear=3D"none">&gt; originality:<br clear=3D"no=
ne">&gt;<br clear=3D"none">&gt; <a shape=3D"rect" href=3D"https://www.ebay.=
com/itm/3-NOS-Champion-NA8-Black-Body-Spark-Plugs-Austin-Healey-100-4-Jagua=
r-XK120-MG-TD/393094267661" target=3D"_blank">https://www.ebay.com/itm/3-NO=
S-Champion-NA8-Black-Body-Spark-Plugs-Austin-Healey-100-4-Jaguar-XK120-MG-T=
D/393094267661 </a><br clear=3D"none">&gt;<br clear=3D"none">&gt;<br clear=
=3D"none">&gt; Cheers,<br clear=3D"none">&gt;<br clear=3D"none">&gt; Bob Ha=
skell<br clear=3D"none">&gt; Austin Healey 3000 BN7/BT7 registrar<br clear=
=3D"none">&gt;<br clear=3D"none">&gt; On 1/31/21 6:48 PM, Bob Spidell wrote=
:<br clear=3D"none">&gt;&gt; We are running Champion N3C in our BN2; they w=
ork well.<br clear=3D"none">&gt;&gt;<br clear=3D"none">&gt;&gt; The shop ma=
nual calls for Champion NA.8 (whatever those are):<br clear=3D"none">&gt;&g=
t;<br clear=3D"none">&gt;&gt;<br clear=3D"none">&gt;&gt;<br clear=3D"none">=
&gt;&gt; On 1/27/2021 1:16 PM, Michael MacLean wrote:<br clear=3D"none">&gt=
;&gt;&gt; Not to get too far off the subject about Healeys, but my Harley <=
br clear=3D"none">&gt;&gt;&gt; Davidson (30s technology like our cars) runs=
 the best on the <br clear=3D"none">&gt;&gt;&gt; cheapest Ford Autolite 416=
4 copper plugs.&nbsp; I tried "high <br clear=3D"none">&gt;&gt;&gt; perform=
ance" plugs from Harley Davidson and saw no difference.&nbsp; Best <br clea=
r=3D"none">&gt;&gt;&gt; of all they are only 89 cents a piece when on sale =
and I only need <br clear=3D"none">&gt;&gt;&gt; two at a time.&nbsp; Does a=
nyone know for sure which Champion plug works <br clear=3D"none">&gt;&gt;&g=
t; for the BN2?<br clear=3D"none">&gt;&gt;&gt; Mike MacLean<br clear=3D"non=
e">&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt; On Wednesday, January 27, 20=
21, 10:18:57 AM PST, Kees Oudesluijs <br clear=3D"none">&gt;&gt;&gt; &lt;<a=
 shape=3D"rect" ymailto=3D"mailto:[email-masked]" href=3D"mailto:cou=
[email-masked]">[email-masked]</a>&gt; wrote:<br clear=3D"none">=
&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt; =
Never had much problems with trouble because of plugs on any of my <br clea=
r=3D"none">&gt;&gt;&gt; vehicles in the past 55 years. The only thing that =
is more or less <br clear=3D"none">&gt;&gt;&gt; important is to gap them, c=
lean them once in a while and replace <br clear=3D"none">&gt;&gt;&gt; when =
they are to far gone. I do not think I even did that in the <br clear=3D"no=
ne">&gt;&gt;&gt; last ten years or so. I have nearly always used Champion p=
lugs as <br clear=3D"none">&gt;&gt;&gt; they are very cheap: between =E2=82=
=AC8 and =E2=82=AC15 for four.<br clear=3D"none">&gt;&gt;&gt;<br clear=3D"n=
one">&gt;&gt;&gt; I presume that electronic ignition (Pertronix in my case)=
 may also <br clear=3D"none">&gt;&gt;&gt; help.<br clear=3D"none">&gt;&gt;&=
gt;<br clear=3D"none">&gt;&gt;&gt; Kees Oudesluijs<br clear=3D"none">&gt;&g=
t;&gt;<br clear=3D"none">&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt; Op 27-=
1-2021 om 18:27 schreef Laurie Wilford:<br clear=3D"none">&gt;&gt;&gt; I co=
ntinue to use only Champion plugs in my Healeys but have <br clear=3D"none"=
>&gt;&gt;&gt; experienced at least two episodes of plug problems over the y=
ears. <br clear=3D"none">&gt;&gt;&gt; Based on the number of miles covered =
that is probably not too bad, <br clear=3D"none">&gt;&gt;&gt; but the secon=
d time was with a newly installed set of plugs. One was <br clear=3D"none">=
&gt;&gt;&gt; defective.<br clear=3D"none">&gt;&gt;&gt; Both times the sympt=
oms were intermittent missing both at idle and <br clear=3D"none">&gt;&gt;&=
gt; on the highway.&nbsp; Finally changing plugs was of course one of the <=
br clear=3D"none">&gt;&gt;&gt; last things I did.<br clear=3D"none">&gt;&gt=
;&gt;<br clear=3D"none">&gt;&gt;&gt; Laurie Wilford<br clear=3D"none">&gt;&=
gt;&gt;<br clear=3D"none">&gt;&gt;&gt; Sent from my Galaxy<br clear=3D"none=
">&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt;<br clear=3D"none">&gt;&gt;&gt=
;<br clear=3D"none">&gt;&gt;<br clear=3D"none"><br clear=3D"none">_________=
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[email-masked]

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From: Chris Moog <[email-masked]>
Date: Mon, 1 Feb 2021 12:27:04 -0500

The hotter plug with soot up less (oil or rich fuel mixture).  If too 
hot it will cause pinging (pre-ignition) when run hard.  I think the 
newer plug designs have a wider operating range - hot enough to stay 
clean, cool enough not to ping.

https://www.championautoparts.com/Technical/Tech-Tips/choosing-the-right-spark-plug-heat-range.html

On 2/1/2021 11:17 AM, healeyguy--- via Healeys wrote:
> There is a lot of fudge room on the plugs. How many of our BN1 and 2's 
> out there are still at factory specs. Our BN2 has nearly flat top 
> pistons which bump the compression, yours may have electronic ignition 
> or  a special coil, cam, carbs of something else. Most likely a large 
> number of the cars are not even tuned to get a clean burn. The plugs 
> give you a reading on what is going on inside the combustion chamber. 
> Sometimes a factory recommendation is not the best choice.
> That said the N5C plugs in our BN2 seem to work well.
> Perry
>
>
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/[email-masked]
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