assuming i do understand the dvd lets look at your demo of the single piston motor you built this i believe is a simple bifliar coil wound on a spool, the solinoid inside being soft iron has no permanate magnet field to generate a cemf soooo isnt there a way to calculate magnetic field strength based on number of turns, wire size, volts, amps, then using this field strength we can maybe calculate the nessesary pounds the piston can provide for the crank shaft? solinoids have been around awhile. the geomitry in a soliniod switch might not be what we want for a motor piston but for the size of the coil it might be a start. is there a way to calculate this? maybe i was too specific in my previous post. i am not really looking for a direct induction motor book but rather a more basic book on coil design without a permant magnetic field present, (like a solinoid switch). granted it might not cover the details of how to recover the cemf to charge the source but before i learn about that i was curious about calculating the magnetic field strength in terms of pounds and working from there to the rods and crankshaft in the hopes that i wouldnt have to just start blindly wrapping copper around a core and guess as to whether its enough to pull the rod. hehe.

hope im not rambling here too much
thanks alot for your help!!
Eric