This helps,and it's mostly where I was in the other thread,but doing a terrible job trying to explain.I appreciate being given a chance to explain better,and for you'r correcting the military's figures,which were the biggest cause of the misunderstanding.Craig,I don't remember the 1/3 loss of heat out of the exhaust.I don't know if I missed it before,or forgot it.It's really to bad someone hasn't come up with a design for the rotory engine that can overcome the blowby losses.Because of it's much better mechanical efficiency,It would be an immense improvement over the piston engine.Yes the vapor carburator was extreemly lean burn.And like I said,the design I built from plans worked great,but damaged the engine.The 90% I was talking about in jet design is the combustion efficiency told to me by a former military C5-A cargo jet mechanic friend of mine.I don't remember what the overall efficiency was.But I do know the mechanical efficiency is really poor.Great thermal and combustion though in jet designs.

I agree fuel cells are definitly a great improvement.But it's a shame they currantly still use fossile fuels because these are the simplest for of hydrogen to utilise at present.I know there are claims out there of people seperating H2 from water in small onboard reactors to power their piston engines.But EVERYTHING I have read also,says it currantly takes more energy to seperate the water,then you recieve in energy potential from the hydrogen.And one of the big problems with the process as of this time are the mineral deposits that accumulate on the electrodes,reducing their effectivness.But I wouldn't be suprised if H2 & O seperation can be made efficient simply by finding the right metals for the electrodes.And the right design.Something like the improvements made in lead acid battery design.

One last question on the Pinto we experimented with.Could the MPG improvements have come from that poor engine being pushed to it's thermal limits?I'm starting to believe the tar residue might have been coked oil instead of having anything to do with the fuel.

And my wife and I have talked several times in the past year about the feasability of using alcohol for fuel cell use.Glad to know were not the only ones.And to set up an alcohol infrastructure,we only need look to Brazil.They've had an alcohol economy for several decades now.