Annular boosters on a Tunnel Ram

So, this is my interpretation from my post 58. A larger air bleed will start the system sooner as more air will increase the pressure difference and start the fuel to flow. This will also lean out the WOT. If the air bleed was increased too far, it eventually will flow no fuel. I also believe each set up will need its own mix, so each application will need its own experimentation to find the correct set up. O² sensors can misrepresent as to what the burn is actually doing. A lean reading can be a result of fuel and O² not mixing due to timing, flame propagation misfire, etc. Testing will need to be done. It was told to me by an engineer at work...think of fuel and O² molecules at a dance. The idea is to have gas and O² to be able to find their dance partner. Sometimes there isn't time to match up. It is far better to have too much gas and ensure all O² has a partner (rich) vs not enough (lean).

The fuel flow through the main jet is the result of the pressure difference between the atmospheric pressure in the float bowl and the venturi air velocity induced vacuum acting on the nozzle and the main well. The venturi vacuum in the well is reduced (the pressure is raised) by the "air leak" from the air bleed. This reduces the pressure difference that causes the flow through the main jet. If the air bleed were big enough, the pressure in the well would be the same as in the float bowl and no fuel would flow. Think about drinking through a soda straw with a hole in it above liquid level. Bigger hole, less soda. Suck harder, not much more soda. Big enough hole, no soda. This is the means by which the emulsion system can "lean it out on the top end". Incidentally, the vacuum that lifts water up a soda straw is in the most sensitive operating range for emulsion systems.