Ha ! ok speak too soon and you get your wish , yesterday’s daily run , i noticed no orange glow from the lighting/nozzle tube after putting the gas torch to it for 10 seconds ,normaly after pointing the gas gun under the drum for a few seconds i put my hand under the tube and see a reflection of the glow on my hand, but yesterday nothing , but i knew it was alight as i was getting gas and a flare from the other end after 2 mins , and engine fired up and ran for about 2 or 3 hours .
This morning i have emptied out about 100 litres of charcoal from the drum leaving a very pretty volcano on the bottom of my drum and covering up my boron carbide nozzle , anyway after carefully tapping away at my glass volcano i ended up with what is left of the Boron carbide nozzle all 1/2 inch of it , this first one was 1 and a half inches in length , so thats lasted inside 45days , and i worked out that would have been roughly 30 days running @ a average hourly rate of 4 hours , and thats about length of time i was getting from my home made refractory nozzles made out of store bought material .
Anyway i have this new supposedly tungsten/boron carbide nozzle to install now and shall be running that in a couple of hours time , again with no water drip or EGR ,and in the mean time i shall try and get hold of a proper Tungsten Carbide nozzle to play with .
Here are a few terrible quality pics taken on my phone just so you can get an idea
This is the new nozzle 2.1/4 inches in length next to whats left of the old one