MY Water Injection System

[Harlan]

I inject at 25% but I have no intercooler on a high compression engine. Also I have not played with lower rates yet. Remember your engine uses a lot of fuel at high load, so 300L/hr is not as big a number as it seems.

I manually set the arduino PWM frequency to 122hz to run the fuel injector. Here is a link.
https://arduino-info.wikispaces.com/...-PWM-Frequency

[teoman]

I am already doing the PWM frequency on many projects. Just thought that i could help if you were not aware.

Do you have a water pressure regulator on your system? Or just straight from motor to injector.

Also how do you trigger the injector? I was intending on using a simple mosfet.

[teoman]

Found the pump for a good price over here. 5l/min, 100PSI. Water pump for a yacht.

While looking I also saw this:
https://www.aliexpress.com/item/12V-Portable-100W-160PSI-High-Pressure-Self-priming-Electric-Car-Wash-Washer-Washing-Machine-Cigarette-Lighter/32721808252.html?spm=2114.10010108.0.0.kle7EX&scm= 1007.12908.37901.0&pvid=15216caf-2ce9-475a-8369-cd3cbb33dd1c&tpp=1


It looks interesting as i will have a something else to do with my investment if the project fails.

What do you guys think of the water pump there? Any good or garbage? The yacht one was looking a bit more robust in the pictures.:
https://www.hepsitekne.com/mors-hidrofor-pompasi-51

[Harlan]

I have no pressure regulator, but the pump does cycle on an internal pressure switch. I also had to add a water hammer arrestor as a mini accumulator to prevent pressure from surging as the pump cycled.

The electrical side of things is just an over rated logic level mosfet and a resistor. I ran short on room on my PCB so the mosfet and resistor are covered in shrink tube and part of the wiring harness.

[teoman]

What is a hammer arrestor?

[teoman]

Ok saw wat it was.

If i have one of these blocked at one end and with a T on rhe other side i can achieve the same thing.

If it is inverted the water / air interface should act as the piston.

Look what I found on AliExpress
http://s.aliexpress.com/RZ7vIvEr

[Stubby79]

How are you going to generate boost if you're not burning much fuel? Unless the steam from the water is enough expansion to make up for the lack of expanding exhaust gases that make the turbo spin...

[teoman]

Theoretically for the same power output, the amount of gas output pressure should be the same (not counting the different mass of the gasses).


Check out the water injection wiki.

[MeteorGray]

I was always under the impression that the performance advantage of water-injection systems for diesel vehicles were:

1. It reduces exhaust gas temperatures, thus allowing the engine to be used at its highest level of power with reduced risk of heat damage.

2. When methanol is added to the water, the engine can realize some enhanced power along with fuel mileage as a result of burning the methanol as a fuel. However, the cost of methanol can negate the fuel mileage enhancement.

Water itself has no calories to burn, but some say the water can turn into energy by converting into steam in the cylinders. I question how much energy actually can be realized this way inside a fuel-burning diesel engine.

I considered a water-injection system for a diesel truck that has no intercooler in order to control EGTs, but gave up the idea for various reasons.

[teoman]

Oil pan 4 is getting a %6 improvement in mpg with his water injection system.

I am hoping to get that amount and maybe a little bit more after tuning.