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the reason i was wanting to you the water is to cool the egr gases and eliminate the build up of crap in the egr system
Effects
In a piston engine, the initial injection of water cools the fuel-air mixture significantly, which increases its density and hence the amount of mixture that enters the cylinder. An additional effect comes later during combustion when the water absorbs large amounts of heat as it vaporizes, reducing peak temperature and resultant NOx formation, and reducing the amount of heat energy absorbed into the cylinder walls. This also converts part of combustion energy from the form of heat to the form of pressure. As the water droplets vaporize by absorbing heat, it turns to high pressure steam (water vapor or steam mainly resulted from combustion chemical reaction), that would add engine output. The alcohol in the mixture burns, but is also much more resistant to detonation than gasoline. The net result is a higher octane charge that will support very high compression ratios or significant forced induction pressures before onset of detonation.
Fuel economy can be improved with water injection, although the effect on most engines with no other modification, like leaning out the mixture, appears to be rather limited or even negligible in some cases.
Some degree of control over the water injection is important. It needs to be injected only when the engine is heavily loaded and the throttle is wide open. Otherwise injecting water may simply drown the engine and cause it to quit.
Direct injection of water is possible. In a piston engine, this can be done late in the power stroke or during the exhaust stroke.
Use in automobiles
A limited number of road vehicles with large-displacement engines from manufacturers such as Chrysler have included water injection. Saab offered water injection for the Saab 99 Turbo. With the introduction of the intercooler the interest in water injection disappeared, but today, water injection is also of interest because it can potentially decrease nitrogen oxide (NOx) emissions in exhaust. The most common use of water injection today is in vehicles with aftermarket forced induction systems, such as turbochargers or superchargers. Such engines are commonly tuned with a narrower margin of safety from detonation and hence benefit greatly from the cooling effects of vaporized water.
now it says that having no other modification makes it to where there is almost no increase in FE but i'm planing on rebuilding my motor in the future with higher CR but right now i want it mostly for reduced nox emissions, and it will cool the EGR gases that can hit between 300 to 1000 degrees from what i read.
P.S. i don't believe wikipedia to be wrong but i don't expect it to be right on absolutly everything there's got to be something wrong in there somewhere but i don't see everything as being wrong just for the 1 or 2 things that are wrong i mean there only human after all.
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