Göran, I did see the fire extinguisher, but what caught my eye was all those treassures to the sides. The “dymmel”-auger for example. I used one for a cleanout auger for my first gasifier.
Next post popped up. That’s a really shallow heart. Are those Imbert dimentions?
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Hi Cody, that is just the answer i wanted, i was on the right track, i have tig- nozzles 8, 10 and 16mm and a piston wrist-pin 15mm inside, i’ll see what i use. For the rpm, i have no idea, going to try to measure it this weekend.
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I made my guess with 2000 RPM. It probably idles at 800 or 1000
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With 8 or 10 you won’t have excessive air velocity so I wouldn’t worry about blast effect.
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Yes, i have lot’s of good-to-have stuff laying around 
As for the dimensioning i used SMP,s dimensioning tables, should be close to Imbert dimensions.
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Is the SMP table the one in the book labelled GenGas? I think I know what you’re talking about.
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Thanks Cody, i think i should try with a tig nozzle, tested some yesterday, heating a nozzle with propane-torch to glowing red, dropped it on the concrete-floor and no cracks.
Only to come up with a way to mount it to the airpipe.
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I don’t remember if it’s a table from SMP in the book Gengas, but think this table i used is somewhat newer, around 1974, if i find it i’ll post it here.
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Did I count 12 nozzles in your firetube, I never heard of a 12 nozzle Imbert design. On the leading cutting edge here.
Bob
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Hi Goran, I also first installed a ceramic nozzle from a tig welding machine in a charcoal gasifier, but it melted quickly, and then I replaced it with a steel one made from a piston bolt made of high-alloy iron, which withstood all tests. 
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Hi Bob, now when you say it, i actually have to count them, 
i was pretty sure i had 10, but i remember the dimensioning table had different alternatives, from 8, up to 12.
Im going to take some better pic’s this weekend, when full daylight and everything cleaned.
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Hi Tone, thanks for the information, maybe i should try with piston-bolt, easier to connect (weld) to the air-pipe also.
But i just remembered i have some nozzles from a scrapped original Imbert heart laying around, made of Kanthal, (ni-chrome alloy) one of them should work.
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I had to guess because part of a picture was missing. As far as I know I am the only one who has built 12 nozzles in a WK Firetube.
Bob
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Hi Bob, i had to go out counting them, it was 10,
Anyways i know SMP used 12 in some, and i think Vesa Mikkonen used 12 nozzles also.
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I too dislike the cheramic stuff. Also problems occur if you want to inject water. It will thermal shock crack. Like tone sayd, good steel with a lot of mass and a good thermal connection to distribute the heat is the way to go.
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You know Tone I haven’t thought about this but you could make this have a changeable nozzle if you use pipe. Use a cast iron pipe coupler for where you drill the holes. That way if she melts, you aren’t entirely out of the project.
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Sounds like a WK Firetube to me.
Bob
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That is an interesting and easily made idea Tone but do you think that the pipe above and below the nozzle in the hot zone would last long? I like the idea of the coupler for the nozzle Cody. I think a union with hole drilled around may be more durable. Either way it won’t be coming back apart after it’s been in the reactor.
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Bob, it IS. Also like a flute. They both work on the same principe.
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