RussellMc wrote: >> No, he said "the output", meaning the exhaust stream of the car. You >> can't use a heat engine to cool its hot input to below its cold >> input. > > You appear to be serious. Note his next response which just arrived. He has now "clarified" his statement to something totally different that neither of us were interpreting. He still mentions something about cooling the *exhaust* though, although now it's clear he's so confused that I hate to guess what he really means. You also have to keep the history of this OP in mind, particular the brilliance level of past comments. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .