[Fot] need help w/40 DCOE 151 carb setup

[J.C. Hassall]

Gurus, I need some help with my Webers.  I have a matched pair of 151s 
with the following configuration: 55F8 idle jets, 1 1/2 to 1 3/4 turns 
on the idle mixture screws, idles nicely at 1K RPM with ~ 1/2 turn on 
the idle speed screw.  Accelerator pump jets are 40s, the pump exhaust 
valve hole soldered shut (the ball valve still works).  Main jets ranged 
from 150 to 120, with various combinations of air bleeds from 150 to 
190.  The plastic float levels have been set to 14.5 and 22mm, to reduce 
fuel in the well.  The problem is that above ~2K RPM the AFR drops to 
high 10, low 11, so of course the engine runs like crap.  One more bit 
of info: fully closed the throttle plates are mid-way in the first 
progression hole.  One Weber parts distributor said that was correct for 
151s, another said that the carbs must be binding because the 
progression holes should be clear at fully closed throttle.  Hmmm.  The 
throttles have no binding that I can feel (linkage disconnected).

I took a set of main jets and filled the fuel hole with JB Weld, 
thinking I'd start really small and work up.  As a baseline test I made 
a run with the hole still closed and the AFR was still ~11.5.  Ah ha!  
That tells me that it's not the main circuit which is the problem but 
rather the accelerator pump circuit.  I noticed that at 2100-2200 RPM a 
ball of fuel forms on the jet, then drops into the venturi; that seems 
wrong to me, but I've not found any info in a myriad of Weber books on 
what might be wrong in the accelerator circuit .

Falling back on my Army career, I'm tempted to implement my mantra that 
"there's no problem that judicially placed high explosive can't solve".  
Before I start shopping for C4, anyone have any ideas?  Any and all 
advice gratefully accepted.

Tnx!

jim

-- 
Jim Hassall
Blacksburg VA
'63 TR4 in autox preparation
99% finished, 90% to go