Adam,
I disagree, I have read of many standard NA engines running on
Hydrogen, requiring timing to be retarded only because of the faster
flame speed. The biggest problem being flashback in the inlet manifold
due to its high volitarity, of which there are ways around this problem.
A while back when I was researching into Mothballs into the fuel tank I
came across a fuel FAQ:
Search for "Gasoline FAQ" and you should find it on the net. A good
read.
I have included part of it on Avgas for comparison.
I'd appreciate if you could point me to somewhere that shows the octane
of Hydrogen and which test method was used.
-------------
9.5 Why are hydrogen-powered cars not available?
The Hindenburg.
The technology to operate IC engines on hydrogen has been investigated
in depth since before the turn of the century. One attraction was to
use the hydrogen in airships to fuel the engines instead of venting it.
Hydrogen has a very high flame speed ( 3.24 - 4.40 m/s ), wide
flammability limits ( 4.0 - 75 vol% ), low ignition energy (0.017 mJ),
high autoignition temperature (520C), and flame temperature of 2050C.
Hydrogen has a very high specific energy ( 120.0 MJ/kg ), making it
very desirable as a transportation fuel. The problem has been to
develop a storage system that will pass all safety concerns, and yet
still be light enough for automotive use. Although hydrogen can be
mixed with oxygen and combusted more efficiently, most proposals
use air [114,119,121-124].
Relevant properties include [116]:- Avgas
Propylene Oxide 100/130 115/145
Density (g/ml) 0.828 0.72 0.74
Boiling Point (C) 34 30-170 30-170
Stoichiometic Ratio (vol%) 4.97 2.4 2.2
Autoignition Temperature (C) 464 440 470
Lower Flammable Limit (vol%) 2.8 1.3 1.2
Upper Flammable Limit (vol%) 37 7.1 7.1
Minimum Ignition Energy (mJ) 0.14 0.2 0.2
Nett Heat of Combustion (MJ/kg) 31.2 43.5 44.0
Flame Temperature (C) 2087 2030 2030
Burning Velocity
-------------
Craig.
Adam wrote:
>
> Hydrogen has a very low octane rating. You would need to have a
> supercharger running 20psi to get 80% of the power, on Hydrogen, that you
> used to get from a NA petrol car.
> At 11:09 PM 3/11/2000 +1000, you wrote:
> >Lets not forget though that the Hindenburg had a rather embarassing moment
> >caused by Hydrogen. Extremely volatile gas and I would hate to be using it
> >for anything. I have made a Hydrogen generator in the lab and witnessed its
> >effect. Worse than my missus after a big night on Crown Lager and Cocktail
> >Onions.
> >
> >OH SHIT HERE SHE COMES QUICK HIDE ME.........
> >
> >Regards
> >Brad HALLETT
> >http://www.powerup.com.au/~bhallett
> >
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