You can only achieve the efficiencies you seem to be suggesting at extremely high combustion temperatures - truly extreme to take the 42% or so theoretical maximum on current combustion engines up to 80%+. Because of the very efficient fuel cell competitor for your technology, you will have to...
Ethanol is more volatile than standard gasoline, and in many areas is allowed to test at a higher vapor pressure. I think those must be places where the allowance is not in place. If you can get your gasoline with ethanol to test within the standard, it can be used in those places.
This map is...
The ethanol could also be causing something in the system to change, like a temperature somewhere in the system, that causes a different fuel map to be utilized.
BigClive,
I don't think there's anything technically incorrect with what you are saying.
Here is why I wouldn't state things that way - first if I make an engine with high CR relative to low CR, and run the thing without fueling it, the exhaust temperature of the high CR is higher than the low...
BigClive, I'm not sure what you mean by that, but without modification that is a misleading way to think about it. The single greatest effect is that you have a more efficient heat engine from a greater temperature difference enabled by the high compression ratio. Since one side of this is...
CI runs cooler because more of the energy is going to work rather than heat, and because there is so much inert material to absorb the heat energy. At load, they can run very high exhaust temperatures.
Expansion ratio and nonhomogeneous fuel air mixtures are not the correct way to view this...
Some pretty typical numbers - a commercial diesel engine will run (at some loaded value) around twice the compression, and per unit volume maybe 4 times the moles of cylinder gas, and maybe 2.5 to 3 times the mass of fuel. The peak combustion pressures and temperatures are both much higher than...
The correct answer to your question, within limits, is yes. Torque (if that is what you mean by "load") multiplied by engine speed is proportional to the engine power output. If, by load, you mean the torque at the engine tailshaft, then cutting load in half at the same speed cuts the power...
Rod - no offense taken. I may know how cars work, but I don't get involved in the maintenance. I even (gasp) get my oil changed at Jiffy Lube. Not that they are better than me (although maybe) but at least they will buy me a new engine if they screw it up. I think many consumers, the folks car...
A few thoughts:
Every car I've owned before the year 2000 had a failed brake. Usually, a previous owner drove with it engaged. It would hold a parked car generally, but was worthless as an auxiliary braking device. Granted, we're talking about a long line of old, crappy cars.
@Mike - you are a...
I understand that a number of skilled drivers have opinions on the many ways they can use the hand brake to enhance their driving experience. However, given that these situations are few, even skilled drivers rarely think of them at the needed moment of duress. Hand brakes are often failed...
Warpspeed,
There is more energy per unit volume in diesel, but less energy per unit mass. That sort of wipes out the airplane theory. And the difference is modest (maybe 10% net specific energy per volume). The bulk of the fuel efficiency difference really is the combustion mechanism.
See my...
If you make gas out of water and then burn it, if water is the product of the burning, then you must lose useful energy in that cycle. If the product is something having a lower energy level than water, then theoretically you could have some net energy there to recover. Unfortunately, water is a...
