a group here http://gekgasifier.com/ has designed a open source wood gasifier to power generators, cars, and machinery.
from their website:
Our project started with the open source Gasifier Experimenter’s Kit (GEK), supporting research, education and DIY hacking in biomass thermal...
Downloads: A new file has been added by TcCoVeN:
Constructing wood gas generator
Construction of a Simplified Wood Gas Generator for Fueling Internal Combustion Engines in a Petroleum Emergency.
Published March 1989 (reprinted July 1989)
By Oakridge National Laboratory