[Gasification] Questions on gasifiers form a newcomer

[Javier Bonet]

I have a few doubts that could be easy for the veterans of the list to answer.

1) As the size of the gasifier is reduced, the temperature goes down, due to the surface to volume ratio, so a small hot zone, and at lower temperatures, this should define a limit as to how small a gasifier can get to feed gas to a small engine.

2) As for small engines, how small can they get, I have seen photos on the web of a motorcycle with a gasifier. what are the problems and of using a small engine, (i am thinking of a 900 cc gasoline engine) with and oversized, undersized and just right size gasifier? I read somewhere that you need to modify the camshaft in some way, how? and how important is it?

3) what could be the performance and problems of using a oversize and undersized gasifier with an small engine.

4) As I understand and please correct me if I am wrong, (and thanks to Williams for his excellent postings, thanks Doug), once you can achieve and maintain a hot zone inside the gasifier, if you inject steam (not water) the steam suffers a thermolisys and splits in oxygen and Hydrogen, hydrogen is welcome to the efficiency of the gasifier, and the oxygen burn more fuel , but where? should you decrease the intake of air as this happens? is this oxygen burning fuel lower in the downdraft gasifier? is the temperature increased? how hot must the gasifier be to start injecting steam? what is the smallest gasifier that can do this? can you inject steam in a gasifier burning wood?

Thanks in advance for your answers.

Javier Bonet