Water Injection

Kiwi,
not really. Filters and water traps are for keeping water and moisture out of fuel injection systems, where it can cause lots of expensive damage to injection pumps and injectors.
The water injection being discussed here is injecting water into the inlet manifold, therefore the first time the fuel and water meet, is in the cylinder when both are atomised.

Cheers,
Dion.

Fair bit of info here:
http://en.wikipedia.org/wiki/Water_injection_(engines)

The residual water I reckon would not be a problem - the system I am thinking about would only inject (before inlet manifold) according to boost, so as you park up there would be no water going into the cylinders, so I reckon there would be a minimal chance of things going rusty! From forum searches there is a little bit of feedback on WI, but not much and seems to be quite old? Whole concept is quite intriguing...

From Aquamist web site:


"Hello, I enjoyed reading your web page. I researched what the Army studies in the 70's on the subject ICE (In-cylinder Engine Cooling) cooling as found in your references. I have obtained copies of the reports.

In 1970, W.D. Weatherford, Jr. and R.D. Quillian presented to ASE a paper, Total Cooling of Piston Engines by Direct Water Injection (Trans. 700886). This study looked at performance of a spark-ignition engine and found that engine cooling can be achieved without adverse effects on combustion or engine performance by injecting water on the compression stroke. Also, NOx are reduced. BSFC was not significantly reduced.

In 1974, S.J. Lestz, R.B. Melton, Jr., and E.J. Rambie took the above authors' work further and reported similar conclusions in Feasibility of Cooling Diesel Engines by Introducing Water Into the Combustion Chamber (US Army Report 750129). Conclusions highlighted that the BSFC improved 5 - 20%. The best improvement was achieved by spraying water into the chamber during the compression stroke. NOx decreased and HC and CO tended to increase. Direct water injection was not recommended for ground mobile applications because full water recovery was not feasible above 100 deg. F. ambient temperature.

I was intrigued by the statements found in the paper about diesel. By injecting water into the cylinder late in the compression stroke, power was increased by 20.8% (with a corresponding reduction in BSFC). The exhaust had a gain of 17.5% in available energy due to generation of steam and coincidentally, a reduced temperature by several hundred degrees. Also, the indicator diagram shows higher pressure late in the power stroke. "

Thanks David,
luckily my turbocharged 1HZ has no electronics beyond the fuel cut-off solenoid :-)

I do not as yet have an intercooler, and for sure a water spray system over the intercooler would drop charge temperatures (I used to have a WRX with such a set up). I am currently considering both intercooling and WI, so trying to get as much feedback as possible. What is interesting is that the WI would provide cooling when most needed (i.e. high boost) but on the other hand one of my concerns is that further torque would further stress engine components...
Gil

Have you clicked on "technical" to the left ?....silverback

Thinking back, the F27 Fokker (as used by TAA) used to use water injection to boost power on takeoff, but was limited to a 30 second period only.

Yea, I seem to remember a water/ethanol mix.....silverback