Hey Russ,
I hope you are well, I hope you don't mind me resurrecting this post
I'm just dipping my toe on the possibility of moving from my constant fill to a metered pump, and wondered if you could help with some more detail please?
I guess the main question is, does the metering pump just pickup the unheated WMO from your WMO supply (already filtered and de-watered) and deliver it to the siphon nozzle without any further heating, other than the nozzle heater? If so did you need to do anything with regards improving the nozzle heater, as in increase the wattage of the cartridge heater, or increase the nozzle temp set point, or does the fact that you are running the siphon nozzle at much higher air pressure, mean that it atomizes and fires easier? Given the increasing air pressure on the siphon nozzle would normally result in a narrower/longer flame, what have been your findings with regards this?
My concern with the angle change, is that I currently use a -9 nozzle, with only 1/2" siphon lift height to generate about 3.2L/h with nearly 80deg angle, due to having a short chamber in my boiler, and from the Delavan charts, I'd be probably have to go down to a -3 nozzle, with 15psi Air but I'd end up with a very narrow angle?
What nozzle, air press & oil flow rate are you running please?
Many thanks,
Gerry