water into efi system before injectors.

[Ade + Lamb Chop]

At 20:20 13/03/00 -0700, Greg Hermann wrote:
>>yea well, so much for hooking up a mapsensor to the windshield wiper
>>motor.......
>>
>>seriously, are there any papers which discuss the pertinent math involved in
>>water injection for non-turbo apps?
>>byE
>>Mike
>>Swayze
>
>No papers I know of, but have done the math/thermo. Comes out to about 75
>or 80% of mass flow rate of stoich fuel mix fuel flow in water will get you
>saturated vapor conditions at TDC when it's time for the spark. Any more
>than this, and you lose power.
>
>Same old saw--gotta have the H2O atomized, but not vaporized until the
>intake closes, or you lose because water vapor (molecular weight = 18)
>displaces a lot of air (avg. molecular weight =29), thus losing you power.
>
>Ideal amount of water increases with increasing effective compression ratio.

So what is the deal with water inj on NA engines? I understand why it is
good on turbos but why on NA engines? Does it allow you to run higher CR or
something? How much increase are we looking at??

Ade

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