So it seems that I am not alone with the “wet” nozzel situation that gradually degrades the quality of the flame and builds up varnish. While at a industrial supply company the other day; I asked if they had burner nozzels…. ( a 0.75 GPH, x 80 deg, semi=solid) they said yes, and I picked up a couple of Carlin brand nozzels. I took one apart and the design is different than the Hago or Delvan nozzels. My thought is that perhaps in addition to the variables of GPH rading, spray angle; ( the nozzels come in “hollow”, “semi- solid”, and “solid” spray patterns) that perhaps a certain brand may work better (or worse) than another.

Guess what we need is a test bench to set up about 20 combinations of nozzels complete with diffuser… (diffusers vary in design as well) and see if we can eliminate the “weting” issue…. Another thought for those who want to buy nozzles from your local industrial supplier… When I asked if they had a “0.75 GPH x 80 degree, semi-solid nozzle”… the guy at the desk did not bat an eye… He presumed I was a burner technician… Know the terminology… Act like you are a pro and they will not question your intention…

Since the nozzle build up does not occur in unheated nozzles using HHO would it make sense to modify the fuel supply system and leave the nozzle “stock”? If (like automotive vegoil conversions) the burn is started on HHO and once the flame is established the fuel is switched to hot wvo it seems to me like ignition problems would be eliminated. But more important..if the nozzle is purged of wvo by switching back to HHO before the burn is allowed to end wouldn’t the “varnish” accumulation problem be eliminated? I suspect that any wvo left in the nozzle cooks in the nozzle from latent heat in the nozzle/combustion chamber as well as the heat supplied by the electric nozzle heaters. This causes any vegoil present in the nozzle to expand and “leak” out the only place it can. The leaking wvo then cooks into a varnish deposit on the outside of the nozzles and possibly the inside as well. Whereas HHO has a low residue when it leaks out and evaporates (since it is a distilled product) wvo has a high level of residue upon evaporation. Therein lies the problem I think. As elegant as the current wvo heating/viscosity solution is…I think it may be pointing us in the direction of an improvement.

This is a possible alt. As you will read in a post I wrote before reading this one, I tested a dual fuel system with poor results but it could be refined… if thats what your after. I have just ruled it out as a user friendly/safe application and it’s almost useless to the boiler config..What I mean is, there is a lot of oil in the pump, feed tube to run clean with HHO before shutdown and It is going to take a lot longer than 2min to accomplish this and that is not acceptable in a boiler config. When temps are a factor and the amount of cycling a boiler does. Now, I am using a single pipe system to test this and there is a reason for that…two pipe system will work a little better at the WVO purge but it involves more solenoid valves to go bad and the possibility of pumping one tank into another and over flowing oil into your home. (Not Good) I know when Dana wrote that the latent heat left over in the chamber could be the suspect..he meant to say sensible heat.

But this is a very good point that he mentions and should be looked into further, I someone with the time in service could answer…what do you think guys? I found that HHO also leaves a buildup on the nozzle, not as bad as WVO but I find this is because of “the Drip” this can be almost eliminated with a shutdown solenoid on the HP line at the pump. I also found this to be a problem when the wrong nozzle angle is used. Most of the calls I would go on when I was a tech I’d find that the previous service man installed a nozzle with to high an angle… a lot of people think that a wide angle nozzle will work at atomizing better than a 70 or 60 deg not true they cause more problems with the burner head and igniters. Use the recommended angle for the burner head assembly if you don’t know which nozzle to use a call to Dan the Tech @ Beckett will set you straight… It’s all relative to your burner head and what gpm your burning. Just don’t tell him what your burning! :0) good luck to all, just please be careful.