Re: BMW's duel Hydrogen & Gasoline Car (Internal Combustion)

From: K. Jones (shadetree1999_at_hotmailNODAMNSPAM.com)
Date: 09/29/04 

Date: Wed, 29 Sep 2004 16:08:25 -0400

"Eunometic" <eunometic@yahoo.com.au> wrote in message
news:e935396a.0409281645.284581ec@posting.google.com...
> Will we ever see practical and affordable fuel cells cars powered by
> hydrogen.
>
> Maybe we don't need fuel cells.
>
> BMW has produced a car, the BMW 745h (that's h for hydrogen) which
> runs on both gasoline and hydrogen: this then overcomes the problem of
> a limited number of hydrogen filling stations and a limited range (not
> often needed) that would limit the appeal of such cars.
>
> Although hydrogen gas has a better octane rating than petrol and is
> resistent to preignition due to compression ignition that should have
> rendered it an ideal internal combustion fuel it also ignites easily
> due to to hot spots which are made worse due to carbon residues by
> duel fuel use. The answer has usually been the Wankel Rotary or the
> use of water sprays or very carefull cooling.
>
> BMW seems to have overcome the problems on essentialy ordinary engines
> by using the variable valve timing common in many cars today to phase
> the valves such that they flush the combustion chamber with air and
> thus cooling it more thorougly and removing carbon residues.
>
> BMW likes using liquid hydrogen tanks and has a long and succesfull
> history of doiing so but the standard 25 cubic meter 3600 psi
> compressed natural gas tanks used with more than safety than standard
> petrol on millions of cars and millions of forklifts world wide would
> contain the equivalent of 8L (2.2 gallons US) of hydrogen. In a car
> equiped with hybrid technology AND duel fuel capability that should
> provide plenty of range.
<snip>

Liquid storage?

I'm curious, if you don't drive you car for a couple of days, and leave it
parked in your garage, what happens?

K. Jones

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