BMW is exhibiting a "bi-fueled" (hydrogen and gasoline) internal combustion engine this week at the 2006 Hydrogen Expo U.S. in California, along with an in-vehicle liquid hydrogen storage system. BMW claims 230 hp from its bi-fueled engine, with more power to come as the design is optimized. The 6-liter V12 used in BMW's hydrogen-fueled H2R land speed record car (pictured) developed about 285 hp.
The other critical element of the bi-fuel powertrain is on-board hydrogen storage. Liquid hydrogen is the most efficient form of the fuel, with the highest energy density, but it demands a storage system capable of maintaining temperatures at a frosty -253 deg C. BMW's high-tech "thermos bottle" solution uses multiple layers of synthetic foil under a high vacuum.
[Sources: BMW, Automotive News]