RoadTrek Boy
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I've been following this thread with interest, I work for a large company that re-manufactures diesel engines and transmissions, mostly for heavy plant and railway use, one of our customers asked us to investigate this type of system along with the supplying company, we have a team of highly qualified engineers and technicians with many years experience in the diesel engine industry, the testing was to be carried out on our premises under controlled conditions, we allocated one test bed for this purpose, the first test was conducted with the standard engine as rebuilt by us, the results were taken after the usual run in period and at the eight pre-set power settings, the fuel usage was recorded as was the fuel return to tank. Then the HHO system was fitted, this caused a great amount of problems, they couldn't get the required amount of hydrogen production from their system so they did many modifications, uprating the electrical system being one, after almost three weeks of messing about the customer told the supplier to pack up as the results so far collected made the system not worth investing in and they were also worried about the fire/explosion risk involved in having hydrogen under a passenger carrying vehicle.
As a side note we also long term tested a catalitic system with another customer, fitted to three vehicles, after two years and 200,000 miles each the systems were removed as there had been no recordable improvement in fuel consumption compared to an un-modified engine. So in my opinion these systems are a waste of money.
With Hydrogen on demand you do not produce any gas unless the engine is running! so none is stored.
Not all systems are the same, I can only comment on the one I have fitted, it works for me.