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Mort, Ken,
Some things I am trying to get my head wrapped around.
Lets say the exhaust back pressure is 5 psi, we are running at super slow RPM, and at very light loads.
Basically, I am trying to describe retarded exhaust cam with huge internal EGR.
What happens to the efficiency math now? Our input temp is higher, but our effective compression ratio is also much higher - in other words our peak temp should be higher.
Next question - lets say we inject fine droplets of liquid water into the intake. Some of it turns to steam, but on compression stroke most of it will turn back to liquid sucking some of the heat of compression. When the burn event happens, heat goes up, liquid water turns to steam and creates thrust. as piston goes down, pressure drops letting more liquid turn to steam, albeit sucking up heat to do it.
are we better off with the ideal gas laws pushing on the piston, or does the steam create enough thrust to cool the charge down to convert more energy to motion?
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