Harry Andreas wrote:
In article , Bryan Martin
wrote:

...


The only way to get any kind of gain out of this is to inject the water
itself into the engine. This might give some power gain in the short term
but pumping salt water into your fuel system and engine will certainly do
them no good in the long run. The article specifically mentioned putting
water and an electrolyte (salt) into the booster tank.

Agree on the salt.

Someone else wrote that it was KOH that was added, not a salt.
Dunno why, if it was just a water injection system. Would the
KOH help to control NOx emmissions? Could the KOH be threre
for boiling point elevation?

Water injection only works to increase power if you increase engine
compression. The higher compression ratio gets you more power, the
water injection cools the charge and acts like an octane booster.
Just don't run out of water...

If you are injecting atomized (e.g. liquid) water into the
cylinders then during the power stroke the water will
evaporate. That evaporation converts heat to pressure at
constant temperature. You get a higher compression raio
without a higher temperature. Does THAT help to control NOx,
in addition to giving you more power?

If you run water without increasing compression ratio, you will get a little
due to the density increase of the air, but it's not major.


IIUC, adding the water will increase the compression ratio
due to the phase change of the water. Water injection increases
the compression ratio without changing the geometry of the cylinder
and piston, right?

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FF