Thanks for all the response, lot’s of ideas now, when the truck is alive again, i should temporarily re-route one of my vacuummeters, to the intake, to compare the vacuum readings, on both wood, and gasoline, maybe ill be able to just re-adjust it, to shift good-on-wood ( 
) ?
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I slip in a little update on the moped gasifier, im slowly recovering from covid, so today i felt good enough to do a little cutting and welding.
Im going to try this, a piece cut off from an old gas-bottle, i’ve welded 3 of the nozzles in to it, then i made some “reducers” out of stainless hydraulic tubing, and welded them inside.
Hopefully the kanthal nozzles should shield the pipes so they hold up better?
Im going to cut the fire extinguisher, that should become the gasifier, and weld in this piece, then make a air-mantle, mostly to get even air-distribution, to shield from air draft, and to adapt water-drip or steam.
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Goran maybe you can test the truck by installing an adjustable valve
Restrict the valve on woodgas to see if reducing vacuum flow improves shifting.
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Well G.K. I read you do understand what is happening from manifold vacuum on gasoline versus manifold vacuum when the engine is forced to suck a gasifer train.
The on gasoline in transmission pressure modulator says the adjustment is close.
The in transmission modulator is an engine load input.
Then some transmission have a throttle plate cable wire called a TV (throttle valve) input too. This controls the line pressure for stronger plates squeezing. These are always adjustable. Adjustment is critical.
And the older transmissions the connected shift kick down rod lever.
How I’ve diagnosed the vacuum affecting is to use my own in cab hand vacuum pump. With an added bleed down valve.
Tone with gasoline the idle, or part throttle intake vacuum will be high. ~.7-.9 bar
Wide open throttle the intake vacuum will be low. ~0. -.1 bar
Sucking a wood gasifier system - i do not have numbers. But it will be a higher intake vacuum, longer, probably never low.
Ask other to check theirs.
Steve unruh
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Yes Steve , it seems I always have some vaccum reading if I am 1000 rpms. If I let off of the accelerater pedal quickly it will go to 0 vaccum on the gasifer then vaccum again. Gauge flutter I guess? This is on my gasifer others could be getting different vaccum readings.
Bob
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Bob it could be gauge flutter, or some kind of pulse maybe?
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All I know it is running great right now. BBB the wood.
Bob
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Hi Bob, this thing you describe is something i’ve experienced too, and others the same thing, should be “after-gassing” gasifier produces overpressure gas for a short moment, very common. If one uses a one-way, check-valve? don’t know the exact designation for the flap-valves used in old gasifiers air intake, this becomes much more noticeable, often pushing gas, backwards through air/gas-mixer air inlet, causing engine to stall when releasing accelerator. ( i’ve experienced that alot on my Volvo, where i used a check valve on the gasifier)
I don’t know if this i valid for a WK gasifier, i guess that is what you use?, but i think every gasifier works this way, a higher mass should probably act to smooth this after-gassing, make it act as a “gas reserve” instead, which is good for mobile applications.
Just some thougts here…
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The little moped gasifier slowly taking shape.
Grate in place, a piece of stove rope seals around until ash settles.
The lid comes from a very old, rusted out, food container-something. It was enamelled, no fun to grind off to get it weld-able.
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I can’t believe you built something that wasn’t all stainless. I am starting to think that SS grows on trees in Sweden.
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Göran, can you show what it looks like in your intake after the red / orange hose?
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Ofcourse Jan, i should try get some time for it this weekend, but as i mentioned earlier i got a leak in the filter cloth, so it’s probably not a nice sight. 
I think it could be alot of soot gathered in there, i drove about 10 month’s with the leak.
Thats the reason im going to disassemble the filter for check, going to be a dirty work.
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No Tom, i save the stainless for bigger build’s, watching over my stainless scrap-pile like a hawk
Anyway, if this works well, and i like it, i maybe recreate it in stainless 
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It’s nice that you have that option Goran. Many years ago I worked for a company that manufactured and installed Automotive paint systems. Everything was made out of stainless and at the time I consider working with it a big PITA. Now I wish I had some.
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Hey Goran
Maybe you or Steve Unruh can answer this question.
Why do the Finn’s like VesaM prefer to have a stack of pipes in a column for their gas coolers? Does it help prevent frozen water collect in the pipes, or do they just prefer the smaller footprint of that style of cooler as opposed to a bed rail? It does seem pretty simple to clean out.
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VesaM has tried using different filtering arraignments since his beginning in the 1990’s.
The vertical tubes filter is a HOT filter using a membrane sewn cloth. Soot cakes build up on these fabric tubes doing the actual filtering. Then cleaning is tops down blowing the cakes off from the top of each tube. All contained. Very clean. The soot cakes settling into the bottom for scraping out removal.
He has a youtube video of this up, open source.
Search for it.
Regards
Steve unruh
Edit add:
2:30->4:16, then 5:28->7:45
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I have not seen any pictures of a filter like that, only bag style filter I had seen was Patrick in his truck with the individual bags sewn into tubes. The air compressor on board is a nice touch and I really like the no mess clean out. It seems I wear a permanent coat of char and soot dust these days 
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Dutch John emulated making a many tubes fabric hot filter on his Volvo car . . .
they are very sensitive to not hot wet gasses. Clogs them.
They are very sensitive to one pulled thru hearth spark. That lights off the soots and then burn down.
Not forgiving at all to operator errors.
He choose not to use them on his smaller engines projects.
S.U.
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Sounds like a stay away from for heavy footed me haha I like my char black and crispy, not my filter system
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I am sure this is why Wayne with the WK Gasifier and the whole system was thought out carefully by him. I have found charcoal in my Hayfilter too. I have always wondered how far does the charcoal go if the Hayfilter was not there. Out the exhaust tail pipe?
Bob
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