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Originally Posted by Reed
I am not sure about that but i do recall reading something about the water turning to steam in the cylinder and slightly increasing the effective compression.
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If you can find me any links on that I would be very intrested in seeing them, but I think you will find that there is not a great deal of increased pressure before TDC because water is a vapor form acts just like any other gas when the temp is raised. One mole occupies 22.4 liters at STP (standard temparature and pressure) just like oxygen or nitrogen. The only thing that might raise the pressure a little is that once completly vaporized it would take roughly 60% less heat to raise the pressure of water vapor as it would oxygen (water molecular weight in 10 while O2 weight is 16), but the amout of water is not enough to make this a significant problem I would think. But like I said maby there is somthing that I am not taking into consideration so if you can find that link I would love to see it.