Since I had some down time today, I went back and read through both charcoal nozzle topics. I realize that my firebrick idea may have distracted us from Dave’s very important discovery that Tungsten Carbide is a winner for a charcoal gasifier nozzle. It is looking like Dave is about to surpass his 200 hour goal.
I see that there are solid TC nozzles with 3/4" NPSM threads (same threads as NPT, but without taper). They come in various IDs. I see some on ebay with what looks like a 1/2" orifice (sweet spot for a wide range of small engines?) that work out to about $20 a piece:
I’m thinking of adding a little of Sean’s kiln wash to keep the slag loose and some high-temp anti-seize to seal the threads into a 45 degree NPT coupling. Is this the holy grail for a SimpleFire style gasifier? A permanent, off the shelf, easy to change nozzle? Am I missing something? What would be the weak point(s) in this nozzle set up?