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Plugs too hot?
On Aug 23, 2015 6:01 PM, "J.C. Hassall" <jhassall@gmail.com> wrote:
> Tnx Tony. I neglected to say that the Isky 777 was degrees bang-on. My
> first thought was the cam but am sure it's ok.
>
> It's only had the Webers and I don't have SUs to try. I am running short=
y
> air horns (to fit inside the filters).
>
> Valves are set right and no manifold leak detected by spraying carb
> cleaner around the manifold.
>
> jim
>
> Fat-thumbed from my iPhone
>
> > On Aug 23, 2015, at 8:41 PM, Tony Drews <tony@tonydrews.com> wrote:
> >
> > I run slightly larger mains and smaller air correction - 36 chokes. I
> think you're in the range on mains.
> >
> > New engine? Run OK with other carbs but not with the Webers? Are you
> sure your cam is timed right (that's the first thing that came to mind -
> mis-timed cam)? Intake manifold properly seated? Valve adjustment OK?
> >
> > There will be a certain amount of "standoff" where there's an atomized
> fuel cloud at the entrance to the carb and that's not abnormal.
> >
> > I run air horns to manage the air flow and try to keep that cloud of ga=
s
> in the carb.
> >
> > Cheers, Tony Drews
> >
> > At 07:14 PM 8/23/2015, J.C. Hassall wrote:
> >> My TR4 spits thru the 40DCOEs at idle and speed.=C3=82 Timing is set =
to 32
> degrees at 3K RPM, so idle is about 12 degrees.=C3=82 I thought that spi=
tting
> thru the carbs meant too much advance, but I believe timing is ok.
> >>
> >> The AFR (sensor is in the 4-1 collector - bad idea) at idle jumps
> between 13.8 and 15.3 (seems like an enormous swing!).=C3=82 Spitting do=
esn't
> seem to coincide with any specific AFR.=C3=82 The carbs have been synche=
d, etc.
> =C3=82 34 chokes, 50F9 idle jets, mains are 120 with 200 air correctors.=
=C3=82 The
> mains seem awfully small.=C3=82 Even so, the AFR at speed is 12.8-13.5.=
=C3=82 Plugs
> are NGK BP6HS, which are sooty; the ground lug burns clean about half way=
.
> >>
> >> What am I doing wrong???=C3=82 I'm at the end of my wit (you're right
> Craig, it's a very short walk)
> >>
> >> tnx
> >>
> >> jim
> >>
> >> 63 TR4 in autox prep, 99.5% finished, 90% to go
> >> _______________________________________________
> >> fot@autox.team.net
> >>
> >> http://www.fot-racing.com
> >>
> >> Donate: http://www.team.net/donate.html
> >> Archive: http://www.team.net/archive
> >> Forums: http://www.team.net/forums
> >> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/tony@tonydrews.com
> >
> >
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
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>
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<p dir=3D"ltr">Plugs too hot?</p>
<div class=3D"gmail_quote">On Aug 23, 2015 6:01 PM, "J.C. Hassall"=
; <<a href=3D"mailto:jhassall@gmail.com";>jhassall@gmail.com</a>> wrot=
e:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Tnx Tony.=C2=A0 I=
neglected to say that the Isky 777 was degrees bang-on.=C2=A0 My first tho=
ught was the cam but am sure it's ok.<br>
<br>
It's only had the Webers and I don't have SUs to try.=C2=A0 I am ru=
nning shorty air horns (to fit inside the filters).<br>
<br>
Valves are set right and no manifold leak detected by spraying carb cleaner=
around the manifold.<br>
<br>
jim<br>
<br>
Fat-thumbed from my iPhone<br>
<br>
> On Aug 23, 2015, at 8:41 PM, Tony Drews <<a href=3D"mailto:tony@ton=
ydrews.com">tony@tonydrews.com</a>> wrote:<br>
><br>
> I run slightly larger mains and smaller air correction - 36 chokes.=C2=
=A0 I think you're in the range on mains.<br>
><br>
> New engine?=C2=A0 Run OK with other carbs but not with the Webers?=C2=
=A0 Are you sure your cam is timed right (that's the first thing that c=
ame to mind - mis-timed cam)?=C2=A0 Intake manifold properly seated?=C2=A0 =
Valve adjustment OK?<br>
><br>
> There will be a certain amount of "standoff" where there'=
;s an atomized fuel cloud at the entrance to the carb and that's not ab=
normal.<br>
><br>
> I run air horns to manage the air flow and try to keep that cloud of g=
as in the carb.<br>
><br>
> Cheers, Tony Drews<br>
><br>
> At 07:14 PM 8/23/2015, J.C. Hassall wrote:<br>
>> My TR4 spits thru the 40DCOEs at idle and speed.=C3=82=C2=A0 Timin=
g is set to 32 degrees at 3K RPM, so idle is about 12 degrees.=C3=82=C2=A0 =
I thought that spitting thru the carbs meant too much advance, but I believ=
e timing is ok.<br>
>><br>
>> The AFR (sensor is in the 4-1 collector - bad idea) at idle jumps =
between 13.8 and 15.3 (seems like an enormous swing!).=C3=82=C2=A0 Spitting=
doesn't seem to coincide with any specific AFR.=C3=82=C2=A0 The carbs =
have been synched, etc. =C3=82 34 chokes, 50F9 idle jets, mains are 120 wit=
h 200 air correctors.=C3=82=C2=A0 The mains seem awfully small.=C3=82=C2=A0=
Even so, the AFR at speed is 12.8-13.5.=C3=82=C2=A0 Plugs are NGK BP6HS, w=
hich are sooty; the ground lug burns clean about half way.<br>
>><br>
>> What am I doing wrong???=C3=82=C2=A0 I'm at the end of my wit =
(you're right Craig, it's a very short walk)<br>
>><br>
>> tnx<br>
>><br>
>> jim<br>
>><br>
>> 63 TR4 in autox prep, 99.5% finished, 90% to go<br>
>> _______________________________________________<br>
>> <a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a><br>
>><br>
>> <a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D=
"_blank">http://www.fot-racing.com</a><br>
>><br>
>> Donate: <a href=3D"http://www.team.net/donate.html"; rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
>> Archive: <a href=3D"http://www.team.net/archive"; rel=3D"noreferrer=
" target=3D"_blank">http://www.team.net/archive</a><br>
>> Forums: <a href=3D"http://www.team.net/forums"; rel=3D"noreferrer" =
target=3D"_blank">http://www.team.net/forums</a><br>
>> Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/optio=
ns/fot/tony@tonydrews.com" rel=3D"noreferrer" target=3D"_blank">http://auto=
x.team.net/mailman/options/fot/tony@tonydrews.com</a><br>
><br>
><br>
_______________________________________________<br>
<a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a><br>
<br>
<a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive"; rel=3D"noreferrer" target=
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asgee22@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.team.n=
et/mailman/options/fot/chasgee22@gmail.com</a><br>
<br>
<br>
</blockquote></div>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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