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on friction and heat Posted by TML [Email] (#2212) [Profile/Gallery] (more from TML) on Mon, 5 Dec 2011 06:15:52 In Reply to: Re: Vapor Engine can get 100MPG+ thoughts?, TML [Profile/Gallery] , Fri, 2 Dec 2011 17:28:58 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I concede that friction may not be a significant source of heat loss. I just realised there's a major consideration that hasn't been addressed. Water in the combustion chamber can indeed be used to prevent PRE ignition, but this does NOT imply that actual ignition temperatures can be reduced. Maybe they can be reduced, but it's pretty easy to see that there's a very finite amount you can reduce the temperature in the combustion chamber before there isn't ignition anymore. If you pour water on a fire, it puts the fire out by reducing the temperature. The same basic principle has to apply in an engine. There is a minimum temperature at which the fuel will burn under a given set of conditions. Might this explain why you can't get a five fold increase in fuel economy by simply reducing combustion temperature?
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