I finally got to try my Annular 850 DP list-9380 > the below as taken as a starting/observation reference
1)Jetted out of the box 78 square
2)Two PV's 6.5 and 1/2 idle vacuum 13"
3) floats set properly
4) set idle for max RPM with vacuum gauge = 3/4 out
5) #31 discharge nozzles P&S
6) fuel psi good = 5/7 lbs
OPERATION...
*Good idle but seems a little too choppy for 900 rpm
*Holding @ 1600 rpm engine has a faint sputter/miss
*in the 4000 rpm range engine goes flat > almost like there's a rag over the carb > then it comes to life when the PV opens.
*max RPM is now only 5K and down 2/300 rpm from my little 715-vacuum secondary carb
Vacuum Gauge Observations... vacuum seems a bit high for cam
Idle = 13"
2500 = 15"
3000 = 14"
3500 = 11"
4000 = 8"
5000 = 5" and as low as it goes
*Plugs appear to be safely on the rich side and NOT heavily rich.
*As primary throttle blades open > a steady supply of fuel from discharge nozzles > as secondaries open they also receive a steady flow of fuel = smooth transition between the two
*Looking into carb at idle nothing leaking into carb > when I blip the throttle I see fuel discharging from the annular boosters.
Your thoughts?
Thanks, Ray
PS. I can tune any Weber or Dellorto DHLA-40 and my 715 VS very well but, this Annular 850 DP will be tricky.