Bob, if I remember right all the pvc tubing are 1 7/8 on the Volvo. The Mazda may have a section or two of the sturdier walled pipe. Most likely the woodgas valve section under the floor. But remember, the Mazda is 2.6 l. Exactly half the displacement of your Dakota. The Volvo is 2.3 l 
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On my 5.2L dakota I have two 2 inch pipes going from the gasifier to the motor . At high rpm and full throttle if I kill one of the pipes I notice just a very little loss of power . If I open this valve back up and kill the other I would expect the same reaction . If not I may have a pipe that is clogging or leaking air.
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Yes the High speed of the air from the Imbert nozzles is much different then the lower speed of air coming from the WK style nozzles. This is why I moved my distance up closer to 10" from nozzles to the restrection opening. This gave me more distance after the restriction open to the grate. The hottest part of the lobe is the area where the most air or oxygen is present. When a hard vaccum pull is generated from the engine, the lobe has to move towards the direction of the pull. But when it gets to the restriction opening this is where the highest exchange of oxygen is being done and at the hotest point. For the white hot lobe to move down it needs more oxygen to stay alive. This creates a lot of heat showing up at the grate as dead gases CO, H2, a little methane, and nitrogen gases. So I see the restiction open is like a high choaking area of resistance. Or what some say where the intense cracking is taking place.
Bob
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JO, if you happen to want to hear my opinion on the size of the restriction opening, … so, I understand the operation of the gasifier as the operation of the gasifier for gasoline, … the size of the nozzles on the cross section of the fire hose determines the amount of air, but because the gas flow it changes a lot, it also changes the amount of air that maintains the temperature for the processes, … a fairly large fire hose with air inlet at the top will already be cold below, regardless of the size of the limit, at low load the resistance will increase, because it will condense below. In such a case, it is necessary to bring the air lower through the small nozzles, or a larger vacuum will automatically begin to suck air through the small nozzles in the lower part.
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I’m probably already annoying you when I start philosophizing about my understanding of what’s going on in the gasifier, I’m not urging anyone to test my ideas, but now I can I assure anyone who tries this out that they will have a smile on their face. I even installed an air nozzle below the limit due to the grille construction, but I think 4-5 nozzles with a diameter of 4mm raised 1-2 “above the limit and slightly wider would be enough for WK (if the limit is 5” I would install the nozzles in a diameter circle 6 ").
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Not annoying at all.
I’ve thought about this adding vacuum operated secondary tuyres.
On the one hand I’d like to see what you built and get some clarification on what things look like but I am not a member and I don’t know if I should ask these things as soon as you mention WK
I wish there was a clear separation and lock on all discussion of the WK or any other proprietary systems, so it could be a bit easier to know where that line in the sand is.
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Tone, as you already know my Mazda gasifier has lower nozzles too, and I agree, it works like a charm keeping the restriction hot at low demand.
With the Volvo gasifier I wanted to try Wayne’s medicine - more mass and flywheel effect to the restriction. Increasing the size of the restiction opening was just to see if I could lower the vacuum ratio some. The avarage ratio has been a little higher than I like and the resent digging though the charbed revealed there’s quite a lot of ash involved.
On another note - we went for a 100 mile roundtrip today. On our way home we were pulled over by the police - AGAIN. Six of them actually.
- Is that really a working gasifier, one of the officers asked.
- It’s war time, isn’t it? You better get used to them, I replied. He laughed.
As I was busy dealing with driving licence and such, wife stepped in answering questions about gasifier related stuff
None of the questions had to do with wether we were road legal or not. Only the usual - how far on a hopper, top speed etc.
They didn’t agree on having pics taken, but BIG smiles as we drove off
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Good police smile and drive off when no harm has been done.
Most of them are like this, just a tiny portion are jerks who make the rest of the law abiding citizens cringe and worry about a stop and traffic check
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Wallace, I agree. Also, you can get away with quite a lot with just a stupid look on your face
I got busted only twice in 40 years in traffic. First time when I was 15, for hauling a girl on the moped. She got a $5 fine (which I payed)
Second, 20 years ago for having worn out tires.
For some reason I managed to stay away from speeding tickets. Quite a miracle with all the speeding cameras over here.
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Wallace, I don’t know where the line is in the sand, but at WK I like the fire hose with air preheating and a large supply of charcoal. Above, the heat partly radiates upwards, which allows the pyrolysis of wood, and partly the heat is pulled down by the flow of gases, which allows the process of reduction of pyrolysis gases, but if pyrolysis gases too chilled enter this hot area and the gas flow is small, which causes the coal and ash to thicken even in front of the restricted opening, this would eliminate small air supply nozzles just above the limit, … the lower nozzles would actually work to gasify the charcoal
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Maybe that is how I get away with so much 
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You must know where all the cameras are at.
Bob
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@Tone talks about penance and vanity…what the heck…here’s another couple videos 
I was surpriced by a sudden speed bump and happened to shut the camera down, hence two vidoes.
Oh, and @Jan, you asked about any differences with a larger restriction. Nothing obvious after putting down about 450 miles and having a new ash cone established. Maybe it runs just a little bit cooler. When properly warmed up the temp exiting the heat exchanger hovers between 200-270C depending on load.
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Thank you for the ride JO.
So it went colder with greater restriction, it was weird.
It was a nice road you found, is it between Borlänge and Falun?
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@Wayne , what is the size of your pipes inside, between engine and gasifier?
Mine is 1,772 “and I have 5 x 90 degree bends, do you think I would notice any difference if I removed the bends and put 1.9” inside instead?
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Hey JO .
Thanks much for the ride . Bet you can’t make the trip without smiling !!
Jan ,
On the dakota I use two pipes with the inside measure of 2 inches from cooling rails to motor. From the cooling rails through the condensate tank, hay filter and on to the motor there are at least six or seven 90 degree bends.
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Wayne, we were on our way to m-in-law’s, which was just enough to save on the lemons
Jan, when changed out the restriction the ash cone broke and I had to start over again. For the first few hoppers the gas temp was extreemly low - below 150C 20km into the trips. As the ash cone builds up the charbed shrinks and the gas temp climbs - less dwell time for gasses to convert. I belive the ash cone is fully established by now and temps leveled off.
Edit: Yes, it was the small road from Ornäs through Aspeboda.
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Hey J ,
Several years back I was ask by an interviewer how much of an extra load weight wise was the wood fuel for a 3-4 hundred mile trip . I answered, kinda like m-in-law on the trip with you but lot quieter
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In the video JO, I thought you were going really fast on the country roads. I was braking, and steering for you, looking far up the road for you for on coming traffic, looking out for deer, moose. Even with my body leaning into the corners on every turn in the road. Doing the total back seat driving for your safety in mind. All the time you were driving a long holding the phone videoing with one hand and doing everything else with the other. Then I saw the speed you were driving 60 kmh or 37.3 mph. In My mind I said “WHAT THE”, you had to be going faster then that. Is your speedometer reading right?
Oh yes thank you for the wonderful ride.
Bob
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Bob i thought you didn’t use the brakes? Nascar life 
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