water injection = Higher Efficiency?

[oil pan 4]

Water injection - EcoModder
I made this and so far I am the only non spammer that edits it.

DIY Water Mist Injection system install, w/pics (MPG Boost Project) - Page 25 - Diesel Place : Chevrolet and GMC Diesel Truck Forums
I have been reading and watching this since it started, I joined in at post #250. I have some pics too.

So far for my clovis, NM ---> east run I am up nearly 2mpg over last time I ran it. I am getting at least the same result as other 6.5L guys running water injection, which is around +1mpg. Between the wild temperature swings and horrible cross winds I get in the high plains I almost never get any thing resembling consistant testing conditions.
Engine coolant temperatures are down and EGTs are way down at light load.
It is very easy to tell when the water runs out because as soon as I hit any kind of hill with out the water going my loaded down suburban has difficulity getting over it.
The cooling effect of the water is helping to pack more air into the cylinders.

I tried propane injection back in 2006 and me and my truck didn't like it, but with water and water/methanol its what I have been looking for.

[skyking]

Originally Posted by oil pan 4

Water injection - EcoModder
I made this and so far I am the only non spammer that edits it.

DIY Water Mist Injection system install, w/pics (MPG Boost Project) - Page 25 - Diesel Place : Chevrolet and GMC Diesel Truck Forums
I have been reading and watching this since it started, I joined in at post #250. I have some pics too.

So far for my clovis, NM ---> east run I am up nearly 2mpg over last time I ran it. I am getting at least the same result as other 6.5L guys running water injection, which is around +1mpg. Between the wild temperature swings and horrible cross winds I get in the high plains I almost never get any thing resembling consistant testing conditions.
Engine coolant temperatures are down and EGTs are way down at light load.
It is very easy to tell when the water runs out because as soon as I hit any kind of hill with out the water going my loaded down suburban has difficulity getting over it.
The cooling effect of the water is helping to pack more air into the cylinders.

I tried propane injection back in 2006 and me and my truck didn't like it, but with water and water/methanol its what I have been looking for.

I just edited the possible problems section

I have also had a runaway pump caused by a melted AEM methanol controller.
That was less than thrilling, let me tell you.
The new wiring will have a master relay that will kill the whole system for me.

[IamIan]

Originally Posted by drmiller100

will the steam actually slow the flame front? I can understand water, as it sucks heat from the process.

But do you think steam or EGR would slow the flame front?

I suspect both steam and EGR would slow the flame speed ... although I don't have data in front of me to say how much the effect would be.

[oil pan 4]

Originally Posted by skyking

I just edited the possible problems section

I have also had a runaway pump caused by a melted AEM methanol controller.
That was less than thrilling, let me tell you.
The new wiring will have a master relay that will kill the whole system for me.

I am adding more safety systems to my perminant system, things like:
A relief valve commonly found on an air compressor
A normally open solenoid that is energized closed when the system is "on", other wise no pressure will build, that will make it impossible for any water to go to the engine with the system is off
A "key on" power source
A manual reset brake interlock hold in circuit, where the water turns off when ever I touch the brake and I have to manually reengauge the water

[oil pan 4]

Well I am consistantly hitting over 20mpg pulling my trailer loaded with water injection.
Last year doing the samething I was getting 17 to 19 mpg.

Any one still thinking about trying it on a gas engine?

[t vago]

I'm thinking about doing it, actually, but only to be able to run using 87 octane instead of the 91 octane that I'm currently forced to run.

From my abandoned turbocharging project, I've still got the water pump, controller, solenoids, tubing, tank, brass fittings, and various sizes of misting nozzles. It's just a matter of fitting it.

[bazman]

I'm planning on doing it. But it will be in conjunction with a plasma ignition system as that is what is required to fire a very lean mix. I'll also run 50/50 water/meth mainly because on boost that is what I am tuned to run anyway and it saves adding a second water tank.

I'll replumb the existing water/meth set up to feed either pre-turbo or just after (undecided yet as pre turbo is best done by 100% meth and it boost quick enough for me now anyway). The turbo is out back so that will improve flow as now it has to pump the water/meth all the way to the front behind the throttle bodies.

The other system will feed from the same trunk mounted tank and run to where the current jet is positioned - however I will look at plumbing in an actual EFI injector capable of very fine tuning and run it from an ecu. It would kick in under lean burn conditions and could supplement the boost injection (which is on or off). I'll keep it about 12-24" away from the TB to ensure equal cylinder distribution.

I'd hope to be able to get close to 30:1 A/F but factors beyond my knowledge or control may limit that. A late friend of mine achieved that and better. Even if I could run into the 20's A/F at steady cruise it would maintain a worthwhile mpg gain. As for part throttle around town/city driving - that'd have potential to lean off too for better mpg but would take a lot more tuning effort and use a lot more water.

[Apexaddicted]

Its been almost 5 months since this thread was updated. Has anyone made any progress?

I have been considering this setup for a while on my motorcycle. 1 map tuned for economy, 1 map tuned for power.

Another very drastic theory i have thought up after reading through the thread was the elimination/restriction of the coolant system. Would this provide more heat back to the combustion chamber for the water imjection phase change without causing damage?

[toc]

The piston and valves are designed to compress air.. Water could be bad if the heat isn't there to flash it to steam.

[Apexaddicted]

I think you may have misunderstood me. Everything in the cycle would be the same, save for the water injection, but the excess heat that is conventionally leeched to the coolant system would be limited. The goal of course would be to allow the injected water to absorb this heat and aid in expansion. The main argument that was brought up earlier in this thread was the lack of heat energy in the combustion chamber to fully vaporize all the injected water to steam.

Still curious if anyone has successfully done this yet before i waste more time on trying to improve the process. Anyone?