Quote:
Originally Posted by Stygi
Please explain why WI does not reduce power (even without methanol). Thanks!
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You're condensing the intake air enough that it out-weighs the additional energy loss in the cylinders (you'd have to compare brayton cycle vs. energy cost of water). That's why there's a fine line at which you are injecting too much water and hurting power.
To add...the specific heat capacity of water is 4.18 J/g°C (air is only 1 J/g°C). So, for a typical performance diesel, let's say we're running 100°F intake air and 1200°F exhaust (which isn't really a fair rep of in-cylinder temp, but I'm just making a point). That means, (including the energy of water vaporization, which you could argue it already is) we're looking at about 5 KJ/g (of energy from the fuel/diesel) to expand/energize the water in the cylinders. Compare this to the 0.6 KJ/g required by air, and you can see the difference.
Going back to Begle1's question...if you had a magic tool that pulled the water back out of the air just before the cylinders, you would see very significant increases in power and efficiency.