water injection = Higher Efficiency?

[t vago]

Those kits are primarily for knock suppression. They cool the intake charge enough so that it doesn't spontaneously combust on the compression cycle, prior to being ignited by the spark plug. Alcohol is mixed in primarily as an anti-icing agent - that it is also combustible is kind of a plus for fuel economy. Kind of.

As connecting to a 2004 Toyota? Best bet would be to place the nozzle right before the throttle body - the transition from atmospheric pressure before the throttle plate to manifold vacuum after the throttle plate will serve to evaporate some of the water injection spray, lightening the remaining water droplets to more easily flow with the intake air. It will also cool off the intake air.

[TexasCotton]

will use only in summer temps and interstate cruising

[TexasCotton]

so putting tee around the pcv will not work then?

[t vago]

Around the PCV? After the valve, your nozzle will be exposed to intake manifold vacuum, which would work well enough - just not as good as it could get. Before the valve? Real iffy.

[American Viking]

Originally Posted by TexasCotton

Really confused.
4 the following reason this thread about "water injection" started reading the thread and found the HHO crowd.
I am neither pro or con on HHO just not what I am looking for...............
Water injection aka circa 1975-1980 tech alchol/ water mix and then in vapor form is in fact what I am curious about. This was used in the decade pasts with some results and that is why you can by ebay kits in the 400-500 us dollar range with pump/tank/mister etc.
I am just curious how you tube connect on a 2004 toyota ......the old way was via egr tubes, evap lines with a tee..............

Don't be confused... I was just pointing out that I'm researching both HHO and cold fog.
I tried the old coarse water sprayer systems, back in the late 80's - early 90's as way to keep Turbo-charged and Super-charged engines from detonating. The rule there was only spray after the compressor section as droplets hitting the turbine blades would damage them.
That's part of what has me looking into the cold fog program as it would not have the issues of condensation, pooling and large droplets that the older systems have.
On a 2004 toyota, I'd look for a spot after the mass air flow sensor and before the throttle. I'd probably stick the nozzle into the center of the air hose, and aim it at the throttle body. Try to go for the finest mist you can get to prevent large droplets forming and puddling in the twists and turns of the intake.

[oil pan 4]

If you know what you are doing you can build a sweet water injection system like I did, better than those garbage ebay kits for around $200.
For economy there isn't any point in trying to put water injection on anything besidess a diesel.

[maxc]

Access forbidden!

[gone-ot]

Originally Posted by maxc

Access forbidden!

^^^ it's safe, it's a link to NASA paper on water-injection for jet engines to reduce NOx.

[oil pan 4]

Yes water injection works wonders on diesel and brayton cycle engines, or any thermo cycle with an adiabatic compression process.

[teoman]

I takes 2.2 MJ to vaporize 1 kg of water.
1 kg of gasoline has about 46MJ of energy.

Havent had a look at all the steam table pressure graphs yet, but purely from an energetic point of view, every unit of water by mass cancels out about 0.05 units of fuel.

Energy is used up to vaporize the water. After that both n2 and h2o compete for the thermal energy and expand.