I honor innovators and inventors. I was only pointing out some of the obvious roadblocks he will face to get a net result that may not improve the reliability or power output that is desired.
Combined Cycle (in his case the Otto cycle combined with the modified Rankine cycle) are the most efficient methods of converting heat (burning coal, oil, gas, or diesel) in to rotational energy. This is called co-generation and offers overall thermal efficiency in the low to mid 40% for the available energy in the fuel. These consist mostly of gas turbine (jet engines) exhausting into boilers to boil water to make steam to drive a steam turbine connected either directly to the jet turbine output shaft or to a separate generator directly.
Popular Science had an article on a gas engine/steam generator car where the exhaust gas boils the water to drive a steam turbine that helps powers the crankshaft. It was a very interesting article (It is BMW [http://www.popsci.com/popsci/automot...index.html]and would be available to the public within the next 10 years.) They claim that they have boosted performance 10 % as well as fuel economy by 15%. It did have a condenser to recycle the water from the steam cycle so you would not have to add water constantly.