[RICE RACING]

Full credit for my system ideas goes to Eldred Norman and Hugh McInnes.

Eldred gave me the idea for the air water atomizing nozzel and Hugh the pneumatic nature of operation.

basics first:

A pressure vessel is linked to manifold pressure (open link, no one way valves etc) this pressure being tied to intake manifold pressure determines the fluid line pressure and thus the delivery rate is in proportion to the vessel pressure, it works in an acceptable fashion on most high performance single turbo cars in regards to metering. What happens in this basic form is that at peak boost there is a higher water to fuel ratio or percentage (lets say maybe 35%) and as revs rise past peak torque/boost onwards to peak power point the ratio can come back to a more correct target say of 20%. It naturally delivers more fluid where its needed mostly at peak cylinder pressures (and over doses a bit at lower revs if the boost builds up quickly) but if the AFR is kept anywhere north of 11.11:1 then the power losses of this brief over water rate is below 5% in my experience.

ahhhhh now from this pressure vessel it goes to a filter stage, then a solenoid (which is ok enough to be used with 50/50 water meth) and is controllable enough to be used off a PWM circuit on an ECU that has this function if you want to fine tune the delivery rate at lower rpm's etc. then to the water side of the nozzel.

The other side of the nozzel is plumbed to the same pressure source and it blows a small volume of air out two small orifices which explode the stream of water into finer droplets, which generally are fine enough to allow it to be used on the lower pressure side of a turbo inlet system (between air cleaner and compressor wheel). From my research of war time WI tests this injection location will give a maximum air flow increase of around 4%... so will make your compressor flow 4% more for the same given rotational speed, after this amount the effect gets saturated from the info I have been able to find on the topic.

In its simplest form the WI system is turned on by boost pressure, via an adjustable pressure switch, but in my case I control it off the ECU though I do not trim the delivery rate its set to 100% values so its on or off and flow is determined by boost pressure. Good thing about this is its relative to boost so the more boost you run the more water flow and its basic and seems to work ok for me. The water nozzle has a precision flow control valve so the rate can be adjusted from 100cc to 850cc/minute, according to my calcs at 20% WtoF that should cover a 2.6lt motor to 1000bhp in turbo form.

This is it in action: http://www.youtube.com/watch?v=8Lizxy3XIY8 (on lap top you can see VBOX telemetry of pressure transducers mounted in the water line and air line, doing calibration)

That's roughly everything about it. Once again I cant pay enough respect to the old boys who I got this idea from back when I was doing my engineering diploma and dreaming of one day having a turbo rotary that I could make fast I progressed through weber jets just squirting solid streams of water doh! to running mixes of meth to water cause I could never get it to work with stock ignition, and then not really knowing much about the flow rates to effects or any real progress, I wanted to give up on WI as I thought it was "shit" but when I had one engine fail I decided to look into it properly found the right nozzels, pulled my finger out and tested the flow rates, upgraded the ignition system and the rest as they say is history........ I would never ever run a car without water injection, the more I research it over these years and through my own experiences the more I love the stuff. Sadly its only a topic of interest for engineering types I have foudn over the years its because I honestly believe you need to have some formal thermodynamics and engineering exposure or qualifications to understand all of the old reports you can find these days thanks to the internet. Most enthusiast have no hope let alone performance shops and lord help us the current age of internet only businesses and forum guru's who seem to pop up at a seemingly exponential rate these days.

I love this forum and all of the smart people on it who have contributed and know just how great WI is, it feels a bit stupid talking about this as it was all done and realized to a very high level of understanding during the war in the 1940's, but we can only hope the good word gets spread and many others can benefit from what we are lucky to know

My fingers hurt :lol: