Anyone used water injection to advance timing / improve fuel efficiency?

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Hey friends,

I'm researching water injection (fairly old technique - piston driven warplanes used it in ww2) where a very fine mist of water is sprayed into the intake to cool the temperatures / effectively increasing octane. Has anyone tested this yet?


Seems an interesting possibility. :)
 
Check out Snow Injection, out of Colorado. In a former life, I sold them methanol, that can be added to their water injection kits. They sell a turnkey system.
 
Ok.......

Yes, water injection is a thing and its primary use these days is for turbo charging hi performance applications. We used to run water injection on a rally car which had a 16v turbo charged engine that put out over 300hp. There was a pressure switch that turned the water injection pump on when the boost pressure hit 12 or maybe 15 psi of boost. The purpose was to help cool the incoming fuel/air charge and thus prevent melting pistons.

Using water injection on a cruiser is going to be pointless unless you are running very high compression pistons and an aggressive cam and some sort of radical engine timing and then you would still be better off buying the high octane fuel and adding an octane booster to your fuel.

You get the most efficiency out of an ICE when you lose the least amount of heat. The only reason you inject water into the engine is to cool the intake charge and you only need to do this when things are extreme like in racing or turbo/supercharging applications.

Water-Methanol injection is a little different because the methanol actually burns while the water is there to help cool things off. But this is still primarily found in boosted application or high compression engines. The slow spinning low compression fork truck engines found in our cruisers will see little benefit to an addition like this.
 
Check out Snow Injection, out of Colorado. In a former life, I sold them methanol, that can be added to their water injection kits. They sell a turnkey system.

Thanks aggie - already found those guys :)
 
Ok.......

Yes, water injection is a thing and its primary use these days is for turbo charging hi performance applications. We used to run water injection on a rally car which had a 16v turbo charged engine that put out over 300hp. There was a pressure switch that turned the water injection pump on when the boost pressure hit 12 or maybe 15 psi of boost. The purpose was to help cool the incoming fuel/air charge and thus prevent melting pistons.

Using water injection on a cruiser is going to be pointless unless you are running very high compression pistons and an aggressive cam and some sort of radical engine timing and then you would still be better off buying the high octane fuel and adding an octane booster to your fuel.

You get the most efficiency out of an ICE when you lose the least amount of heat. The only reason you inject water into the engine is to cool the intake charge and you only need to do this when things are extreme like in racing or turbo/supercharging applications.

Water-Methanol injection is a little different because the methanol actually burns while the water is there to help cool things off. But this is still primarily found in boosted application or high compression engines. The slow spinning low compression fork truck engines found in our cruisers will see little benefit to an addition like this.


I found the attached paper pretty interesting ---

"As the water droplets vaporized by absorbing the heat from compressed air, they are converted into high pressure steam. The evaporation of water in small liquid droplets may absorb the heat which decreases the average temperature of suction gas. At the same time, it reduces compression pressure. Hence, the initial injection of water not only facilitates the cooling of the air but significantly also increases its density, allowing more fresh air to enter the cylinder (Fig. 3)."

and

"The water injection significantly cooled the charge gas in the GDI engine or airefuel mixture in an MPI engine and increases the density of air in each case. Hence, higher engine output can be reached with an increase in the fresh-air mass that enters the cylinder. The gains in power output is possible due to the more complete combustion facilitated by increase in the quantity of air by mass. Additionally, engines with higher compression ratios or boost pressures have to support higher octane number fuels as a requirement for anti-detonation. For engines equipped with turbochargers or superchargers, in which the intake air compressed before entering the cylinder, the suction air temperature at the latter part of the compression stroke is higher. This is one of the enabling conditions for detonation. The combination of water injection and boost pressure could be acceptable in this case due to the greater benefits derived from the cooling effects of vaporized water.

Moreover, an engine with a normal compression ratio can also be run on a low octane number fuel in combination with water injection. Water injection can also be applied for cooling of the compressed air leading to an improvement in volumetric efficiency, power output and brake specific fuel consumption, for an increase in the compression ratio."

Your point is well taken regarding our slow spinning / low compression forklifts :) In any case, experimentation with the unknown/unfamiliar is always fun --- will report back any results.
 

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