will catalytic converter fail due to unburnt fuel , will i get fuel pre-ignition

by Paul
(Edmonton, Canada)

I was wondering since there is no computer control on the amount of hydrogen being produced and its a trail and error in adjusting the amperage to the converter, could you not see a case of excess fuel and a poor burn due to improper stoichiometric air fuel ratio , causing your catalytic converters to fail. Also since its a gas going into the cylinder could you also not see a problem with pre-ignition (knock).and the final question is are you not having any problems with flash back , or are you using a flash arrester