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Discussion Starter · #1 ·
Avoiding the political issues in that other thread, there's still a technical one:

"If Schwartzenegger becomes govenor, someone has offered to convert one of his five Hummers to run on hydrogen. This guy has done it before and AH-nold sounds serious about it. This is hydrogen internal combustion like what BMW is working on. It's estimated the Hummer's mpg will double from 11 to 22."

That, I do not believe. OK, you've got some problems defining exactly what constitutes a "gallon" of hydrogen. Of course, seeing as how it's a gas at ambient temperatures, you can (theoretically!) compress it without limit, if you have a container strong enough to hold the pressure, so a gallon could contain almost any amount of hydrogen. Unfortunately, we don't have the technology to reasonably do more that about what a Scuba tank holds - maybe 3000 PSI.

If you go by a sensible measure of equivalent energy content - how many BTUs you get out of a given mass - I bet you'll find that Arnie's Hydrogen Hummer will use almost exactly the same amount of energy going from A to B as a normal one. Probably a bit less, 'cause of the extra weight of the hydrogen tanks.
 

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Discussion Starter · #9 ·
Used to work with a lot of forklifts & such that had been converted to natural gas. It's been quite a few years, but as I recall, engines with carburetors are dead easy to convert, and the same should hold true for hydrogen. Don't know how well it would work with fuel injectors, though. I'd think the metering would depend on the fuel being liquid.

However, I don't quite see where you get much of an environmental benefit from going from gasoline to natural gas. You're still burning fossil fuel, and so dumping exactly as much CO2 into the atmosphere.
 
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