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@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.Ã? Timing is set to 32
>> degrees at 3K RPM, so idle is about 12 degrees.Ã? 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!).Ã? Spitting doesn't seem to
>> coincide with any specific AFR.Ã? The carbs have been synched, etc. Ã? 34
>> chokes, 50F9 idle jets, mains are 120 with 200 air correctors.Ã? The mains
>> seem awfully small.Ã? Even so, the AFR at speed is 12.8-13.5.Ã? Plugs are
>> NGK BP6HS, which are sooty; the ground lug burns clean about half way.
>>
>> What am I doing wrong???Ã? 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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