So I’ve had a few attempts at oil burners. With varying levels of success. The current burner uses a US Marine tent heater and a centrifugal fan. It works but is a pain to light and can be fussy about staying lit.
Now I’ve moved onto a siphon nozzle type of burner. Using compressed air it mixes the air and oil into a fine mist for burning.
Works fabulously on diesel with no modification.
Didn’t work so well with waste oil. Even heating the oil.
But it did work with the application of a burner tube around the nozzle. I’m guessing the turbulent air helps keep the flame lighting the oil air mix.
Next stage is refining the burn tube and oil feed for a better burn. Less unburnt oil spray would be good.