Water injection(aquamist)

[axaQ42]

Hi guys!

Has any of you thought or maybe even mounted a water injection system on his Q4??

This system are not that expensive but the benefits are quite good(lower EGT's,less chances for detonation,...)


http://cgi.ebay.co.uk/ERL-AQUAMIST-WATERINJECTION-KIT-COMPLETE-GWO_W0QQitemZ140307659754QQcmdZViewItemQQimsxZ2009 0315?IMSfp=TL090315121003r21175

http://www.coolingmist.com/pagedisplay.aspx?feature_key=gasvehicles

[arjunior45]

I'm going to test the efficiency / benefits of the oem water spray system this summer.
Can't help you that much right now.

Nick

[Juan AR155Q4]

Axa is talking about injecting water in the combustion chamber.

Here in Argentina, lots of drag cars uses a mixture of alcohols and water to avoid detonation.
For me is not the best solution but it works.

[arjunior45]

oppps, sorry.

[arjunior45]

came in my mind.

Some guys, with cosworths use the oem IAW to guide the water injector, modifying the oem map and using some of the IAWs pin. No more details so far.

Nick

[#84]

Yes I have thought of it, but have several project ahead in the pipeline. A friend of mine mounted it on his Fiat Punto GT with Mitsubishi TD04 turbocharger and race cams. It worked perfect.

I worked with another project involving water injection in Diesel engines and after studiying cylinder pressure v.s. crank angle diagrams in detail we came to the conclusion that the water must have contributed to the thermodynamical cycle during combustion as well giving positive results in efficiency / fuel consumption. Then there are much more to do with water injection with much more potential, but that is another story :)

[axaQ42]

Yes the more i looked into water injection system the more i found that the benefits are quite significat.So i am going to try to install one in the Q4.For starters i will buy one with a pressure switch(set it to around 1 bar of pressure) and get the water from the plastic bag for Water Spray.

I wil report dont worry.

[Juan AR155Q4]

I worked with another project involving water injection in Diesel engines and after studiying cylinder pressure v.s. crank angle diagrams in detail we came to the conclusion that the water must have contributed to the thermodynamical cycle during combustion as well giving positive results in efficiency / fuel consumption. Then there are much more to do with water injection with much more potential, but that is another story :)

What sensor have you used to log cylinder pressure? I suppose a sensor/spark plug.

[#84]

I don't know exactely what sensor that was used during the test, but in all engine devlopmen one or several cylinders are preparated with cylinder pressure sensors. A common method is to drill a small diameter hole from the combustion chamber in to the head and then screw the sensor from the outside into threads made from the outside. The drawback is that accoustic resonance may occur in the channel from the combustion chamber to the sensor. Surface mounted sensors are more expensive and more difficult to fit. However, we onl talk about engines for laboratory use. Unless you have an extra cylinder head do not think about cylinder pressure or cylinder temperature measurements.

[1NRO]

The one that catchs my eye is http://www.tfxengine.com/ who haven't quite got to the market the boost pressure capable spark plug based sensor (the only way I can think of mounting a sensor to gather combustion data on our engine). Affordable when you haven't got anything else to spend money on. Pressure data for every crank degree and true det detection. Interpretating the data is another matter :rolleyes: It'd be no use to you without a very good knowledge of engine theory.

To have unlimited money to lavish on engine development would be heaven, I'd maybe even give an alloy block a go. To think 2 litre engines are capable of 1400 bhp + is amazing, hell, it'd be amazing to give something like Bonneville a go. That gives me a shiver just thinking about it. If you've never seen "The Worlds Fastest Indian" you should, top film. I was reading just yesterday about a fella who broke his class record at over 400mph in 1967 who had his shute rip off and brakes disintegrate after his final run, he free wheeled apparently for 30 miles before ploughing into a lake, proper hero. Anyone fancy turning the engine the other way round and putting an ubber gearbox on to power the rear wheels to mega MPH? Maybe not eh!

Nik

[#84]

Very interesting. I took a look at the sensors http://www.tfxengine.com/SensorsOverall.html and saw that they announce a low cost spark plug sensor for applications up to 1,41 Bar boost pressure. That wouldn't be too bad for engine devlopment. you can of course cut the boost if it is very critical during cylinder pressure tests.

Regarding the film. I agree totally. All petrol heads should see it, and everyone else who like serious films vwith strong stories as well.

Regarding turning the engien 90 degrees - take a look at the 155 V6 t.i.!

[1NRO]

I don't think low cost comes into it, they look at it as low due to the massive costs until recent times. Even so the one you see is over $1000 US just for the sensor and then some expensive boxes of wizardry are needed. Then the cost of gathering the data starts, only for the very serious in my opinion. I'd be waiting for the higher boost level sensor, not much point in the expense for a sub 2 bar boost level.

[Juan AR155Q4]

I?ve just installed one from Kistler (http://www.kistler.com/), not in my engine. At work we?re researching about H2.
Haven?t started the engine yet.
Some pcis:
http://img91.imageshack.us/img91/6914/dsc00108x.jpg
http://img523.imageshack.us/img523/4105/dsc00114z.jpg

[MaxiBoost]

hello juan ,
how is going project (kistler) ?

could you give more info ?

thanks

[Juan AR155Q4]

Not so much info to give by the moment.
I have to buy an encoder for the crankshaft, and then fight with the data acquisition system to configure both signals.
I?ll post as soon as this advances.