There was a PBS "Nova" special about this topic in the
early nineties and someone had a fleet of busses set up to be
able to accept either hydrogen or gasoline as fuel.  Believe it
or not, they sort of worked.  Actually, they worked fairly well
while the busses were moving but the two fuels behave so
differently that the timing which is best for gasoline is not
best for hydrogen.  In one example, they showed a bus idling at a
stop.  The engine backfired continuously, sounding like a string
of firecrackers.

        I don't remember if this was the gasoline-based timing
setting trying to burn hydrogen or vise versa but it was pretty
rough sounding.

        There were the usual logistical problems with the
hydrogen distribution system, but the busses ran and, when
burning hydrogen, didn't foul the air.

Martin McCormick WB5AGZ  Stillwater, OK
OSU Center for Computing and Information Services Network Operations Group

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