water into efi system before injectors.

[Greg Hermann]

>Greg Hermann writes:
>
>>>so, without getting  into details, a normally aspirated high compression
>>>motor could use this to prevent knock by lowering combustion temperatures.
>>>Now could this be knock sensor triggered? would the H2O anti knock rob
>>>more.or less. power than retarding the spark? (rough numbers).
>
>>Water injection won't rob any power if you keep the water quantity from
>>going too high.
>

>
>As to determining how much water can be injected, one could consult
>steam tables, etc and determine from the amount of energy, the
>maximum amount of water which can be evaporated during compression.
>You get a small margin of "safety" due to the heat stored in the
>walls of the combustion chamber from the previous cycle. Don't rely
>on it too much or the thermal cycling could become a problem.
>

This is precisely how I did the calculation that led to the 75--80% of fuel
mass flow rate (at stoich) for a maximum water mass flow rate.

Greg


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