[Fot] TR4 spitting thru Webers - haaaalp!

[Chuck Gee]

Plugs too hot?
On Aug 23, 2015 6:01 PM, "J.C. Hassall" <jhassall at 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 shorty
> 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 at 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 gas
> 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.  Timing is set to 32
> degrees at 3K RPM, so idle is about 12 degrees.  I thought that spitting
> 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!).  Spitting doesn't
> seem to coincide with any specific AFR.  The carbs have been synched, etc.
>  34 chokes, 50F9 idle jets, mains are 120 with 200 air correctors.  The
> mains seem awfully small.  Even so, the AFR at speed is 12.8-13.5.  Plugs
> are NGK BP6HS, which are sooty; the ground lug burns clean about half way.
> >>
> >> What am I doing wrong???  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
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