Aquamist Water Injection nozzle sizes are being used?
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From: Huntington Beach
Fperra,
Finally someone with one installed, Just curious about how much boost your are running with 0.9mm water jet and 660cc injectors?
And why were you going to step down to 0.6mm again?
I really didn't understand why you would step down to 0.6mm if 0.9mm is already working for you?
Finally someone with one installed, Just curious about how much boost your are running with 0.9mm water jet and 660cc injectors?
And why were you going to step down to 0.6mm again?
I really didn't understand why you would step down to 0.6mm if 0.9mm is already working for you?
Joined: Apr 2002
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From: Gold Coast
Originally posted by AusS2000
I think you'd really want to keep an eye on your water levels with that set up.
Now, stroker kit with low comp pistons, SC with smaller pulley, uprated injectors, E-manage, and water injection. That's my dream set up.
I think you'd really want to keep an eye on your water levels with that set up.
Now, stroker kit with low comp pistons, SC with smaller pulley, uprated injectors, E-manage, and water injection. That's my dream set up.
my setup would be tooo risky
don't want no water in my engine 
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Joined: Nov 2003
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From: Jersey City
As one of the early replies mentioned you should be looking at the amount of water that will be flowed through the jet at a given pressure.
When implementing water injection you should be looking at how much water is going to be injected relative to the amount of the intake charge (air and fuel). However it is usually easier to determine just how much fuel is being injected and by impication the relating to the total intake charge. As a purely hypothetical determination of jet size:
4 cylinder engine
400 cc injectors
75% expected max IDCs
4 X 400 X 75% = 1,200 cc of fuel
For solely additional knock suppression purposes without any intent to optimize fuel and timing for water injection you can inject as little as 2-5% water to fuel so jet and pressure combinations that use 24 cc to 60 cc would be sufficient. Without tuning control of fuel and timing anymore water than this would likely lose power because you are slowing early combustion with water and slowing later combustion with the overly rich OEM fuel settings.
If you are going to be using water injection to tune your engine to an optimum power AFR of 12.5:1 then you need to be thinking about 15% water to fuel. Let's say that the max IDCs if you were to tune to that level were 70%, in that case your jet will need to deliver around 170 cc of water.
The amount of water does not need to be exact - but these are approximate levels to think about.
Another consideration is you really should vary the amount of water with the amount of the intake charge / fuel. If you use water injection over a wide operating range a level flow of water will only be effective at a narrow point, below that point you are flowing too much water and above that point even worse you are flowing too little. If you are using aquamist 2d - keep in mind the pressure/jet combination will be limited to the IDC of the referenced injector - so you have to apply the IDC to the jet flow characteristic rather than using the stated flow rates raw.
Hope this expanded on the question and helped some. The paper at my site goes into more detail on water injection and I do seek helpful feedback on the paper as it has been greatly improved by the thoughtful feedback of its readers.
Ed.
www.turboice.net
When implementing water injection you should be looking at how much water is going to be injected relative to the amount of the intake charge (air and fuel). However it is usually easier to determine just how much fuel is being injected and by impication the relating to the total intake charge. As a purely hypothetical determination of jet size:
4 cylinder engine
400 cc injectors
75% expected max IDCs
4 X 400 X 75% = 1,200 cc of fuel
For solely additional knock suppression purposes without any intent to optimize fuel and timing for water injection you can inject as little as 2-5% water to fuel so jet and pressure combinations that use 24 cc to 60 cc would be sufficient. Without tuning control of fuel and timing anymore water than this would likely lose power because you are slowing early combustion with water and slowing later combustion with the overly rich OEM fuel settings.
If you are going to be using water injection to tune your engine to an optimum power AFR of 12.5:1 then you need to be thinking about 15% water to fuel. Let's say that the max IDCs if you were to tune to that level were 70%, in that case your jet will need to deliver around 170 cc of water.
The amount of water does not need to be exact - but these are approximate levels to think about.
Another consideration is you really should vary the amount of water with the amount of the intake charge / fuel. If you use water injection over a wide operating range a level flow of water will only be effective at a narrow point, below that point you are flowing too much water and above that point even worse you are flowing too little. If you are using aquamist 2d - keep in mind the pressure/jet combination will be limited to the IDC of the referenced injector - so you have to apply the IDC to the jet flow characteristic rather than using the stated flow rates raw.
Hope this expanded on the question and helped some. The paper at my site goes into more detail on water injection and I do seek helpful feedback on the paper as it has been greatly improved by the thoughtful feedback of its readers.
Ed.
www.turboice.net
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