Originally Posted by Gerald
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The exhausted steam and a large amount of condensate run down the steam pipe during operation.
The burner heats this, again liquid water mixture in the area of the smoke chamber, individual drops of water evaporate explosively, as if a drop of water fell on a hot stove.
The pressure of these many small explosions can then extinguish the burner flame.
A solution, to install a chuffer or something (codensertank) like a member of our livesteam forum Schienendampf once did.
Greetings from Austria,
As Gerald said - though I found it was mostly the oil that was "popping" on my engine. Watching your video, I noticed there's a big puff of steam/smoke when the 'pop' happens, and it looked like blue smoke to me, which means it is oil.
The Rubys are renowned for being messy. Accucraft makes sure the cylinders get lots of oil so the lubricator has a fairly big hole in the steam pipe to let the oil out. (Hence the suggestion to limit the oil, which is not a simple fix.) The oil oozes out of the top of the steam pipe and drops into the hot part of the smokebox. Pop!
Next time, run it with the smokebox door cracked slightly open and see if that stops the fire going out. For some reason, there needs to be lots of airflow through the smokebox when these engines are running, and there needs to be a big hole in the smokebox saddle to encourage that draft.
There have been numerous threads on the subject over the years. Read this one:
and try googling "site:mylargescale.com ruby fire goes out". (If you see something with Dave Hottman's name on it, he's the expert on Ruby problems.)
Finally, as you say you have a chuffer installed - take it out and put back the original 'blast pipe'. See if that changes things. I couldn't tell you had a chuffer from the video - too quiet. And there is a note somewhere in the threads that the chuffer may be too wide and it is blocking the sirflow in the stack - so try the original pipe.