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Old 28-06-2004, 11:32 AM
hotrod hotrod is offline
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Join Date: Oct 2003
Posts: 307
Default temp and humidity

Water injection provides most of its charge air cooling by evaporation. This is most effective when the air is warm. The Nitrous will cool the air charge something like 70 deg F ( 39 deg C). This would pretty much eliminate any evaporation of the water, and reduction in dropplet size. The Nitrous jet will also help mix the water mist with the air stream I would think.

It just seems more logical to me to get the evaporative cooling while you can to add to what cooling the very cold Nitrous will give you.

You also want the liquid water dropplets to have time to dispurse uniformly so you don't have significant differences in water delivered to the cylinders. It seems to me it, will be easier for the Nitrous and the very fine mist of fuel from the spray nozzle to disperse than it will the water mist.

There is also a slight risk of icing of the water injection nozzle if it very close down stream from the Nitrous injection point. That would be very unhealthy for the engine if you are depending on the detonation resistance provided by the water injection.

It would be interesting to see a comparison of several different injection locations for each, but I am not aware of anyone who has published such a test.

Larry
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