[Fot] TR4 spitting thru Webers - haaaalp!

[Tony Drews]

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. Â 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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