Check out Ron Lemler's woodgas tractor! "Last fall I began converting a 1978 International 574 a utility size tractor to woodgas, and it's finally finished!! It has really good power (201 cid engine). I ran a 4ft tiller and didn't have any problem, and it runs down the road at a pretty good clip. I have a 40kw PTO generator I'll hook up and see what kind of power output I has. I used my version of the 1981 MEN gasifier, which I have have good success with on the truck conversion I did 2 years ago."
Read more about Ron's project here.