Oh doe-di-odoe!!! The saga of the woodgas goes on. Today while running the Kirby with no "fire" in the hopper I held a piece of plastic to the mouth where the air gets pulled in and the vacuum pulled the plastic in very quickly. So then I opened the lid and put a piece of plastic across the hopper opening. With the Kirby pulling 5 inches of water on the grate, it sucked the plastic down tight. My conclusion is---- I am pulling good vacuum. More than I have ever before. I did have the engine air cleaner off this winter and sealed it up "tighter than a fat girls socks:" I worked on it until I got it where if I put my hand over the "horn" of the air cleaner, it would kill the engine.
Ok so I put in some wood and "fired" up the hopper. I drove it about 20 miles. I don't have an "richness" gage so I drove it trying to hold the vacuum to 10 inches of water on the cooling rail and 5-7 inches in the hopper. My thinking was that pulling more vacuum would be like "over pulling". It ran pretty good, but a couple of times it got to stuttering so I richened the mix by closing the air and increasing the vacuum up to 15 and 8 in. The temperature went up to about 1500 F I use to run at about 900 F.
So now what????? I will put more wood in and take an other ride hoping that maybe the char bed will tighten up a little and lower the temp. WK says a gasifier uses about 3 time the amount of wood that it should during the time he is settling the char bed. That must mean he is "burn" more wood which would mean more heat????
Steve; My grate is made of 3/8 th rebar. There is about 3/8 th. space between bars. It is mounted solid and the opening between the grate and the ring that contains the reduction area char is about 1/2 to 3/4 inch. So the char can go off the side of the grate, but it has to be so mall enough to pass through that space. Hope that explains it.
Anyways, I see my lopper lid is leaking when I shut down. I will work on that ( to seal another possible leak) then take it for a noter ride and either it will hold up for a trip or I will melt it down right here at home. Next installment to come. Tomc