Water nozzle placement

SHughes

SHughes

Too much is never enough!
Where is the best place to mount the nozzles for a hig pressure water injection system? I willbe installing one on a p-pumped 24v Cummins, but the theory is largely the same amonst all brands.

Seems to be a bit of a Catch 22- you want it in the air stream as long as possible to have the greatest cooling effect, yet the water will seperate from the air as it turns corners in the intake tract.

I've read where some people put it in the plenum as well, but wonder how you get good distribution between cylinders this way.

I was thinking of running a small nozzle right out of the secondary turbo -leading into the intercooler, and another larger nozzle coming out of the intercooler. Makes for straight lentghs of tubing to cool the air before it makes andy turns. I have no reasoning behind my choice of nozzle size either, so if I'm wrong, please tell me.

What say you??
 
Best placement imho, is in each runner of an individual runner intake manifold, spraying right at the valves.
 
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Garrett
 
Individual-runner injection is best, followed by direct-port injection (such as Scheid's); plenum or intake horn injection is fine for smaller quantities, especially if efficient nozzles are used.

Ideally, we only recommend pre-CAC/IC water injection via an axial-spray nozzle(s) centered over the inducer(s) with a flow rate matched to create no more than maximum relative humidity at max boost (a variable-rate pump is great for ramping - helps prevent exceeding dewpoint at lower boost levels).

Saturated air will shed heat more efficiently across the heat exchanger(s), and any water that drops out can easily be drained from the lowest part of the intake tract (typically the CAC).

Of course, saturated air's higher viscosity reduces compressor pumping losses, and unsuspended water molecules are centrifugally forced against the compressor housing to increase gap sealing.
 
If you're running compounds then normal driving would probably evaporate any remaining water automatically.

I just de-winterized my water system yesterday.....

Forgot how awesome the water was. Smoke is down and power is up again.
 
SHughes said:
So why not? I've read before where people do it, it seems to make sense to cool the charge while its at it's hottest, then the intercooler can take even more heat out (or am I off base there). Yes it seems it would pool and seperate, but that can be drained off later.
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I had a 315ml nozzle about 4" away from my secondary discharge. It made a big difference. When I would make a run, I couldn't touch the intake side of my CAC, and could barely hold my hand in the discharge side for just a few seconds. After I put that nozzle there, the intake was warm to the touch, and the discharge was almost cool to the touch. I don't think a large nozzle is needed there, just a small one to take some of the heat out of that initial charge.
 
i have 2 625's in my intake horn, it works really good for what i do, i'll try a smaller nozzle pre-intercooler and see what it does for me
 
cbtoyz said:
I had a 315ml nozzle about 4" away from my secondary discharge. It made a big difference. When I would make a run, I couldn't touch the intake side of my CAC, and could barely hold my hand in the discharge side for just a few seconds. After I put that nozzle there, the intake was warm to the touch, and the discharge was almost cool to the touch. I don't think a large nozzle is needed there, just a small one to take some of the heat out of that initial charge.
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do you have problems with water building up in the IC? Does it puddle at the intake side at all? I don't belive the water would stay suspended in the air through the IC, just wondering if you have had any problems with that set-up.
 
No...It's not like I was spraying constantly. Only when making a run. My oppinion is, there is enough hot air blowing through the IC on the return road or whatever to evaperate any water that may have built up. After you spray, just drive it for a little bit, and let it all dry out. I don't see how it could collect in the IC.
 
Scott...
Someone we both know,who works with and has access to,engineers much smarter than us was told about his water system to move it from the intake horn to before the CAC.The water has a better chance to provide better cooling and will be more evenly distributed than if you place it in the air horn.They had done extensive testing with their trucks on this thus the reason he was given the recommendation........Andy
 
Hammer said:
Scott...
Someone we both know,who works with and has access to,engineers much smarter than us was told about his water system to move it from the intake horn to before the CAC.The water has a better chance to provide better cooling and will be more evenly distributed than if you place it in the air horn.They had done extensive testing with their trucks on this thus the reason he was given the recommendation........Andy
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After, at intercooler discharge
 
That makes perfect sense to me and was where I plan to put at least one nozzle. I'm still debating putting one before the IC (at the discharge of the secondary turbo).
 
The Legend said:
are all of you running straight water or water/ methanol ? do you run Methanol precooler ?
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I run water with an ounce or less water-soluble oil to prevent rust. Methanol is a fuel. Can't time a fuel in a compression-ignition engine if you allow the fuel to enter via the intake valve.
 
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