Alternative Energy Forums

Hiya everyone,

I'm doing a project about part power assist bikes.

Would it be possible to build an ethanol engine small enough to be mounted on a standard 26in bike to provide a partial power assist, i.e. that the bike can be pedaled like a normal bike but the engine can be turned on when required? Do engines like these exist for applications other than for cars (which would be too big and heavy). Where can I find more information about these things?

How does an ethanol engine differ from the electric motors currently used in electric bikes? I have been struggling to find info on the Internet but if anyone knows of any useful links that would be much appreciated. Have ethanol powered bikes been built before?