Just rattling on about this... I was always given to believe that engines produced their own energy forces. An internal combustion engine introduces gasoline, fire, and compression to cause the explosion which is harnessed mechanically to produce ongoing power. (as in internal combustion engines). The same thing for steam engines as they produce their own steam pressure energy. Motors were simply a device that used one form of an energy force to produce another such as an electric motor takes electrical power from whatever it's source and turns it into cranking power such as a drive pulley for a bandsaw or a power pump, for example. Or, a hydraulic motor may take hydraulic pressure and convert it to drive gears. I would suppose that if that same electric motor would also generate it's own electricity for itself to use then it likely would be called an "electric engine". I always flinched a little when I hear people call an "internal combustion engine" a "motor". My dad explained this to me once in a manner that I was able to remember which must have been some time after I was known as a tricycle engine around there. But then, some smarter people than me still call them "motors"... but they should be "engines". Most engines will have another part that is called a "starter" which is the "starting motor" which suck electricity from your battery to generate force to crank your engine which when running produces the energy forces to keep itself running and to recharge the battery so it can operate the starting motor again when necessary... "Engines"... OK? :) _____________________________________________________________________ Ralph Ausmann - Hillsboro, OR <ralph.ausmann@xxxxxxxxxxx> Business Card Page - http://mysite.verizon.net/res79g4m/ "I have an inferiority complex. But it's not a very good one."