No, "60 MPG" has nothing to do with improved ICE's, and everything to do with improved aerodynamics, smaller vehicles, and lighter vehicles. Combustion efficiency has been very thoroughly analyzed. The math guys have come up with equations where you plug in the bond strengths of the fuel, the amount of compression, and out comes the amount of energy you'll get.
And the equations match up, within 2%, with what you actually get in a real ICE. Quoting from an excellent book on the subject: "First, you make a guess at the chamber temperature. (Experience helps a lot here!) You then look up the relevant equilibrium constants for your chosen temperature.
Devoted and masochistic savants have spent years in determining and compiling these. Your equations are now before you, waiting to be solved. It is rarely possible to do this directly.
If you want a conservative figure, you choose to make a frozen equilibrium calculation. (It gives a lower value than a shifting equilib rium calculation.) And you plug the data from the chamber calculaÂtions into the following horrendous formula. C = { 2 * (Ry / (y-1)) (Tc / M) 1 - (Pe/Pc)^((y-1)/y } ^ 1/2Here, R is the universal gas contant, y is the ratio of specific heats, Cp/Cv of the chamber gases.
) M is their average molecular weight. Tc is the chamber temperature. Pe and Pc are the exhaust and chamber pressures respectively.
"And wadda you know, you get c, the efficiency, within 2% of what you get in a real ICE. You'll note that there is no wiggle room-- most of the values you plug in are basic physical constants. The pressures are the only thing you can possibly vary, and those are limited by the self-ignition temp of the fuel, which have already been tweaked as high as it will go with tetraethyl lead or more modern chemicals.
And the (^1/2) square root means even if you change something inside the equation, the overall effect gets halved. The fact that the equation's result matches reality very closely suggests that the equation is valid, and the impossibility of changing the values inside suggest there is nothing left to improve in the ICE-- it's already with 2% of theoretical maximum. Ancient_Hacker 57 months ago.
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