Internal combustion steam engine converting water to steam in the engine and back to water within the engine. No external steam generation is used.
Horizontal cylinder with piston receives alcohol/water mix followed by an injection of either propane or butane. This ignites to flash the water to steam. Water expands by a factor of 1,600 to power engine. After the cylinder is moved air input takes steam back to water. Thus, a little propane/butane is used making little air pollution. See further details on the U.S. Patent Office Website under published applications as Nunley Steam Engine
Problem this idea/invention addresses:
pollution of air and noise