water injection???how does it work

[DawgMode]

Can some explain this for me plz.....how could water be good for the engine bcz i thought that if water is mixed with the fuel it would be a smaller spark

[2Fass240us]

In layman's terms, the water is injected in the intake stream and takes some of the heat out of the air. This allows you to run higher boost sometimes without necessarily having to run higher octane.

[gtune4]

the japanese used to use it in their bombers/fighters after a run/fight for extra speed

[Nismo_Freak]

the japanese used to use it in their bombers/fighters after a run/fight for extra speed

Pretty much everyone ran water injection. The Germans used methanol/water mixtures in their fighters, along with nitrous oxide. We later, of course, adopted the same tricks.

Everyone had widespread usage of superchargers on their planes as well. Only way to get the engine to breathe at high altitude.

[Nismo_Freak]

In layman's terms, the water is injected in the intake stream and takes some of the heat out of the air. This allows you to run higher boost sometimes without necessarily having to run higher octane.

[DawgMode]

i was just askin bcz i might want to put a kit in my car

[gtune4]

does anyone know what kits are avail. or how you would go about doing this to an sr?

[Nismo_Freak]

does anyone know what kits are avail. or how you would go about doing this to an sr?

Build your own, it's not that hard to setup.

Do a search on Google.

[sil beer s13]

Water injection allows you to use the octane fully.

Just because you put 100 octane in your car doesnt mean you using all 100.

As well it lowers intake manifold temperature and pressure. So you dont Knock and blow your engine while running higher boost.

[AmoebAssassin]

Water injection allows you to use the octane fully.

Just because you put 100 octane in your car doesnt mean you using all 100.

As well it lowers intake manifold temperature and pressure. So you dont Knock and blow your engine while running higher boost.

The only part about this post that is factually correct are the last two sentences. Water injection does not allow you to "fully use octane." The second you put 100 octane gas in your tank, you can be damn sure those 100 octanes are working for you. The purpose of introducing octane into gasoline is to dilute the gasoline. By reducing the concentration of gasoline in the mixture, yes, you get marginally less power by virtue of a lesser presence of gasoline...however, the reaction produced is slower due the the lower concentration of gasoline, resulting in a slower flame front and thereby making the engine less prone to detonation and knock. Different octane ratings signify how much octane is dissolved in the gasoline; thus, any octane gas you put its "completely put to use" with or without water injection.

The purpose of water injection is evaporative cooling in the intake tract. When water is misted into the intake system, it is not a vapor, it is a mist--i.e. very well disperesed globules of LIQUID WATER. By absorbing the heat in the intake tract, this liquid water undergoes a phase change into gaseous water, which takes a great deal of heat out of the intake charge. This allows you to push more boost safely than you could without water injection.

[gtune4]

what rate do you inject at, should it go along with boost, rpm, injector duty? intake or after tb? what sort of injector do you use to get a fine enough mist?

[Nismo_Freak]

http://www.kennedysdynotune.com/waterinjected.htm

Good info on water injection. You could build the kit yourself to save alot of money, most parts could be had from an aquarium store.

[codyace]

JWT Is also working on a or has a water injection program......I haven't kept up with it much since being sent overseas..

[PROJECTRB240SX]

CHECK OUT SNOWPERFORMANCE WATER INJECTION KITS.... SUMMIT HAS THEM FOR ABOUT $400 BUT THAT COMES WITHA VARIABLE CONTROLLER (BASED ON BOOST PRESSURE) AND EVERYTHING YOU NEED TO INSTALL A WATER/METHANOL INJECTION SYSTEM. YOU CAN RUN WINDSHIELD WASHER FLUID (PURE METHANOL BASED) IN THE SYSTEM WITH GREAT RESULTS.

I'VE GOT A COBRA BUDDY WHO USES IT AND HAS GAIN 85WHP JUST WITH INJECTION TUNING AND 3PSI (7PSI TO 10PSI).

[tonynalli]

it aslo rasies your compression due to the added volume. but when the used it on fighter jets they only used it when they were in a jam. they couldnt use it for longer then i think it was 30 seconds, and when they did they had to rebuild the motor. but if it saved a 50,000 dollar pilot it was worth the rebuild.

[GripR]

this is awesome info [thumbs up]

[PROJECTRB240SX]

HOW DOES IT RAISE COMPRESSION? MAYBE IT RAISES THE COMBUSTION RATIO (WHICH UPPING THE BOOST ALSO DOES) BUT NOT THE STATIC COMPRESSION RATIO (DICTATED BY BORE, STROKE, AND CYLINDER HEAD VOLUME) OF THE ENGINE.

[AmoebAssassin]

As stated, it does not change the compression ratio at all. Your compression ratio is the ratio of BDC cylinder volume and TDC cylinder volume. Water injection has no bearing on that.