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IMO soot on the plugs always means you are running too rich, at least part =
of the time=2E Since idle mixture is fully adjustable, I would first check =
it by the book (lift the piston test), then if that still puts soot on the =
plugs, try going leaner a half flat at a time=2E
Note that it's also easy to get soot on the plugs when starting from cold,=
which may take some time to burn off, even running under load=2E Also, you=
should be looking at the insulator near the gap, as the metal shell may ne=
ver get hot enough to burn the soot off=2E
Problems with float level (leaky float) or a leaky float valve can also ca=
use sooty plugs=2E
My point of view, hotter plugs are only a workaround for things like exces=
s oil consumption=2E
-- Randall
On 27 May 2019 13:17:09 GMT-07:00, Dave MacKay <dave@mdmackay=2Eca> wrote:
> Sparkplugs for TR3A
>
>Hello:
>
>I=E2=80=99ve been running Champion L87Yc plugs in my 1960 TR3A, gapped to
>0=2E025=E2=80=9D=2E Although
>they=E2=80=99ve been fine, I=E2=80=99ve always been concerned about the a=
mount of soot
>on
>them at the end of each driving season=2E Thinking the soot might be dur
>to
>too rich a mixture, I rebuilt my carbs but didn=E2=80=99t notice any chan=
ge in
>the
>amount of soot=2E It was suggested that I might want to try a hotter plug
>since that might burn away more of the soot=2E According to Champion, the
>next hotter plug to the L87YC would be the L92YC=2E
>
>What concerns ought I be aware of in running a hotter plug? Has anyone
>of
>the list had experience with L92YC plugs?
>
>I researched other plugs that list members are using and found that
>several
>have had good success with NGK BP6HS=2E According to NGK those plugs have
>been discontinued and the recommended replacement is the BPR6HS (same
>plug
>but with a resisitor)=2E I thought I might try a set before moving to a
>hotter plug=2E
>
>I=E2=80=99d welcome any comments=2E
>
>Dave MacKay
>
>1960 TR3A s/n 68639L
>
>Near Toronto, Canada
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<body>IMO soot on the plugs always means you are running too rich, at leas=
t part of the time=2E Since idle mixture is fully adjustable, I would first=
check it by the book (lift the piston test), then if that still puts soot =
on the plugs, try going leaner a half flat at a time=2E<br><br>Note that it=
's also easy to get soot on the plugs when starting from cold, which may ta=
ke some time to burn off, even running under load=2E Also, you should be lo=
oking at the insulator near the gap, as the metal shell may never get hot e=
nough to burn the soot off=2E<br><br>Problems with float level (leaky float=
) or a leaky float valve can also cause sooty plugs=2E<br><br>My point of v=
iew, hotter plugs are only a workaround for things like excess oil consumpt=
ion=2E<br>-- Randall<br><br><div class=3D"gmail_quote">On 27 May 2019 13:17=
:09 GMT-07:00, Dave MacKay <dave@mdmackay=2Eca> wrote:<blockquote cla=
ss=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0=2E8ex; border-left: 1px s=
olid rgb(204, 204, 204); padding-left: 1ex;">
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">Hello:</font></=
span></p>
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">I=E2=80=99ve be=
en running Champion L87Yc plugs in</font></span><span lang=3D"en-ca"></span=
><span lang=3D"en-ca"></span><span lang=3D"en-ca"><font face=3D"Calibri"> m=
y 1960 TR3A</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"><=
/span><span lang=3D"en-ca"><font face=3D"Calibri">, gapped to 0=2E025=E2=80=
=9D</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"></span><s=
pan lang=3D"en-ca"><font face=3D"Calibri">=2E</font></span><span lang=3D"en=
-ca"></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"> <font face=3D=
"Calibri">Although they=E2=80=99ve been fine, I=E2=80=99ve always been conc=
erned ab</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"></sp=
an><span lang=3D"en-ca"><font face=3D"Calibri">out the amount of soot on th=
em at the end of each driving season=2E Thinking the soot might be dur to t=
oo rich a mixture, I rebuilt my carbs but didn=E2=80=99t notice any change =
in the amount of soot=2E</font></span><span lang=3D"en-ca"></span><span lan=
g=3D"en-ca"></span><span lang=3D"en-ca"> <font face=3D"Calibri">It was sugg=
ested that I might want to try a hotter plug since that might burn away mor=
e of the soot=2E</font></span><span lang=3D"en-ca"></span><span lang=3D"en-=
ca"></span><span lang=3D"en-ca"><font face=3D"Calibri"></font></span><span =
lang=3D"en-ca"></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"> <fo=
nt face=3D"Calibri">According to Champion, the next hotter plug to the L87Y=
C would be</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"></=
span><span lang=3D"en-ca"> <font face=3D"Calibri">the L92YC=2E</font></span=
><span lang=3D"en-ca"></span><span lang=3D"en-ca"></span><span lang=3D"en-c=
a"><font face=3D"Calibri"> </font></span></p>
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">What concerns o=
ught I be aware of in running a hotter plug</font></span><span lang=3D"en-c=
a"></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"><font face=3D"Ca=
libri">? </font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca=
"></span><span lang=3D"en-ca"> <font face=3D"Calibri">Has anyone of the lis=
t had experience with L92YC plugs?</font></span><span lang=3D"en-ca"></span=
><span lang=3D"en-ca"></span><span lang=3D"en-ca"></span></p>
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">I researched ot=
her plugs that list members are using and found that several have had good =
success with NGK BP6HS=2E According to NGK those plugs have been discontinu=
ed</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"></span><sp=
an lang=3D"en-ca"> <font face=3D"Calibri">and the recommended replacement i=
s the BPR6HS</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca">=
</span><span lang=3D"en-ca"><font face=3D"Calibri"> (same plug but with a r=
esisitor)=2E</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca">=
</span><span lang=3D"en-ca"><font face=3D"Calibri"> I thought I might try a=
set before moving to a hotter plug=2E </font></span></p>
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">I=E2=80=99d w</=
font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"></span><span l=
ang=3D"en-ca"><font face=3D"Calibri">elcome any comments=2E</font></span></=
p>
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">Dave MacKay</fo=
nt></span></p>
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">1960 TR3A s/n 6=
8639L</font></span></p>
<p dir=3D"LTR"><span lang=3D"en-ca"><font face=3D"Calibri">Near Toronto, C=
anada</font></span><span lang=3D"en-ca"></span><span lang=3D"en-ca"></span>=
<span lang=3D"en-ca"></span></p>
</blockquote></div></body></html>
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