Actually easy to test, if you have a spare stainless pot with lid... (any pot or can with a lid will do)
1: drill a small hole in the lid
2: fill the stainless pot with crumbled charcoal, put the lid on
3: put on open fire or on glowing charcoal (or a very hot electric plate/grill)
4: observe the fumes
5: observe the color, smell, and the taste of the fumes
6: light the gasses coming out of the hole in the lid
7: Observe the color of the flame
where as for meat, its all about taste, medium, au point etc..
for gasifiers the rule is: well done...
If you use the charcoal , smokeless grade, no fumes, no odor, properly sized, then your gasifier will work, your engine will start (if it also can run on gasoline of course)
Put this kind off charcoal in any type of Gilmore style gasifier, it will work...