The Volt ICE It would not be traditional auto engine as it would run at a constant power. What would its weight and dimensions be? I am sure their would be other applications for its use
The Vega was an experiment using a pure aluminum block without cylinder sleeves. GM tried to add a lot of sincone to the aluminum, machine the block and run piston rings right up against bare aluminum. It didn't work very well. The aluminum was too soft and the blocks wore out quickly. Todays aluminum blocks use a steel cylindar sleeves, so the aluminum piston is moveing against steel. Every manufacturer is using aluminum for engine blocks these days almost exclusevely. The days of the heavy cast iron engine block are gone.I don't have much experience with actual running aluminum-block engines, but I once owned a '72 Vega.