Yup… play with it there and see how it goes…
JO; It all of a sudden disappeared because at about 4:00 in the morning I woke up thinking how rude I had been posting all that rubbish. Who am I to be worrying about problems that you haven’t had yet?? You have built it and it IS working. I apologize for the posting and as Arvid was the only one to have replied, I was hoping no one else had seen it. I deleted the majority and that is where it disappeared. I do apologize. You have made a very good build, and I so respect anyone that at this time builds an Imbert. There is nothing wrong with the Imbert, but everyone has blinders on now because the WK is successful and he has made his material available for other to follow. Again I do apologize, honestly and sincerely.TomC
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Hi, J-O!
3.3.2016
In accordance with Arvid, truck-size Imbert GMR:s have been modified to have a “grate shelf” (full diameter) a few inches below the restriction, which also were the end of the fire-tube. They were hand-shaked from outside, not free-dangling in chains.
To my mind enormous heatspoilers, just where the reduction should be “fulfilled”!
But that is not the “worst” yet:
Imbert FSD is blowing the primary air through holes in the (thick) restriction-ring (throat) itself, still with a grate-shelf a few inches below…
Imbert GMR (Grüne Minna Rüttelsieb) Two throat system. 1929
Imbert FSD (Fossil Stahlherd Drehsieb) One throat system. 1944
Max
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Tom, you worry to much 
I don’t mind strait forward questions.
Answers are still there for you.
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Max, there seem to exist many ways of doing this. What is your opinion of suitable reduction hight for my build?
Go on this Arvid-line; and feel lucky with the ash wall insulation!
Max
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Max, JO’s ash wall insulation was Max inspired… just an fyi
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Hi, Arvid!
3.3.2016
Embarassing; didn’t remember that… still prelongin’ the needed temperature.
Max
We could jump on Skype for a Chatt?
“maxgasman”
Max
Lid now seals ok. My tiny spring just needs a little extra help and the lid seals even when pushing (for now anyway).
This vid is vacum mode flaring an hour ago. Pulling through an old radiator. Draining it every 15 min
https://m.youtube.com/watch?v=O8_sgQgN05o
Edit: Is it normal to have a small bridge right above the firetube after sittning a few hours or is air sneaking into the hopper circulation eating my fuel down there?
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My experience has been to almost always have a small cavity between the wood and char bed when I start up in the mornings. If air is getting in very much, you will still have hot coals in the morning. Not good.
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Do you think that the wood cools faster and sticks together while the char cools slower and settles away longer as it cools? That is what I thought was happening with mine.
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Good looking flare, and a lot of it. I hardly have ever been able to flare with out a larger pipe at the end of the pipe where I am flaring. Sure you have noticed it on other flares. For that reason I really think you have a good flame. Hmmm What can we hook this up to ???
Did you have a rubber hose going from the gasifier to the radiator? Couldn’t tell. What did you have to drain every 15 minutes? The radiator?? Good job.
That little bridging is why on a cold start up we have to runn a probe down to the grate. To brake that little bridge down. TomC
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Than you all for quick responces.
Char was dead after sitting 4 hours, so maybe I chouldn’t worry to much.
That was my theory as well, but after seeing a 3" tall cavity I suspected additional air into the hopper after shut down.
If you’re all experiencing the same, I can live with it.
That was flex exhaust pipe.
While flaring I pulled one of the bolts holding the lid on top of the cyclone and put in wife’s digital meat probe. It was still climbing fast when passing 626 F - then only error. I hope I didn’t ruin the tc.
My outer skin beeing preheat and cooling outgoing gas I expected it to be cooler entering the cyclone. I’ve read about crossover temps of 700- 800 F but that is going almost straight from the grate area. Is it possible that I have post grate oxygene from overpulling with fan only? I doubt it. No signs of ashdump air leak. Is it even possible to overpull a small nozzle Imbert (if sufficient reduction) at all?
I think it’s time to find out what kind of vacum I’m pulling.
The radiator managed to take temps down to just above ambient so it collected half a cup of water every 15 min. The hopper collects about the same I think. I use very dry wood. It’s been stored indoors all winter.
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This is what the cyclone collected after 1 hour burntime. Only 2 tablespoons of fine dust. I think this is due to rather big volume gas housing and high outlet.
Hmmm…white in the ash dump. No obvious trails around the seal.
Looking up into grate area. Looks a bit white to me. Maybe this why I see rather high outlet temps. I think I will lower the grate an inch or two.
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I didn’t know you had tablespoons in Sweden. Don’t you measure in cc’s? or are you just making it easy for us old fashioned imperial measurement users? 
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Can’t eat soup with a fork you know!
Women use tablespoons when they bake and gasifier are female, that’s why. 
Actually I would call this a 1/4 of a dl ( 1/4 of a 1/10 of a liter). Easy!
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I knew what ya meant with dl… lol. …
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Hmmmmm… I’d clean out your ash dump some, burn it some more and check again. May just need a bit of time to seal up with carbon. That said, I’ve never had white in my ash dump unless I put it there for insulation myself.
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I’m from the U.S. and I’m pretty sure he’s talking about a deciliter.
Ok, I’ll run another hopper down her throat.
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