Wrong.

Water kept at ambient temperatures isn't going to lower IATs further - or even equal to - ambient. That is, if you were actually measuring IATs. Instead you are measuring a "wet thermometer," with resultant skewed readings. Droplets form on the IAT sensor, draw the IAT sensor's heat into itself, and then draw that extra heat into the engine. Sensor reads less, but that means absolutely nothing.

Water suppresses detonation through it's latent heat of evaporation. It's called basic physics - have you heard of it? Simple thermodynamics.

There are numerous patents available through patent searches, NACA papers, threads on reputable forums, ad nauseam, etc, for you to peruse at your leisure and develop an sound understanding. I could recommend a number of books, but most low rents don't like to purchase those.

tidbit: Merlin aircraft engines were used in various water injection studies. After a certain portion of water:fuel was injected, it was noted that the engine was no longer utilizing it's stock cooling passages. At the end of the testing, since the engine was a write off at that point, the coolant was drained from the engine and it was cooled solely by water injection. After 2000 hours of operation as such, it was dissassembled and found to have normal wear for a stock engine.

Welcome to common pre-WW2 engineering knowledge, available for access on the great interweb.

 

i think honda wasnt using water injection, they were running on like pure toluene and xylene or some other toxic paint thinner

 

Thats what I have heard, I'll have to look through a book I have at home about the Turbo Era of F1 and check it out.

There has to be a way to get it before to Compressor wheel without instant damage, even if it is a minimal amount. The question would then be how much would it affect it if there is not much spray.

 

Water injection was used in the F1 turbo cars until they banned it.

This is a controversial subject, but there's no doubt that water injection will work great for charge air cooling. In the rally cars they use it in corners and such where the intercooler isn't getting much air. And running anti lag, the turbos are constantly generating hot air whether the car is moving fast enough to cool the intercooler or not.
At Ford Motorsports they did some testing with water injecton on a Cosworth rally engine, done on an engine dyno (controlled environment).
Their conclusion was that trying to lower the charge temps past 40°C or so with water injection only resulted in loss of power, and the detonation threshold was the same with the same intake temps, water or no water.
As for the interweb, a great deal of information on the interweb is just plain wrong, because anyone can write a bunch of ---- and post it on the interweb. I can't tell you how many forum writeups I've stumbled upon on various sites that are just total bullshit. Just because it's on the interweb doesn't have to mean it's legit information.

 

No, wrong.

Since it is impossible to cool charge temps significantly with water injection, they did not find out a single damn thing. Cooling combustion chamber temperatures? That is something else entirely.

I agree, most everyone I debate with on message forums are imbeciles.

Here, try a Master's thesis on for size, from Linkoping U in Sweden - they do all the R&D for Scania, and currently have the only mathematical engine model worth a damn. I love it when academics have grease under their nails - lots better than most of the engineering students/grads coming out of the US these days. Page seven will touch upon "wet thermometer syndrome," and cites a basic thermodynamics text as a referrence. Ah, academia, and the interleaving of accepted fact with redneck savvy to build technological wonders...

http://www.ep.liu.se/exjobb/isy/2004/3543/exjobb.pdf

 

That's a nice document, there's one thing though.
Normal automotive air temperature sensors have a very small diameter because they are exposed element design, but there's nothing given in this equation.

 

I like you, you think about things.

 

As I understand it WRC cars spray water on the IC not into the intake path. I believe WRC rules prohibit water injection.

BTW water injection also works on jet engines. The older turbojet powered KC-135's and B-52's utilized water injection for max weight takeoffs. The water was injected between the compressor and the combustor sections. The water would be completely vaporized before it hit the turbines.

 

yes it would vaporize...but we're talking about lots and lots of compressor blades in a jet engine

 

Also, jet engine compressor blades are made a little much tougher than our turbocharger compressor wheels. They are designed to survive junk thrown into the engines at full speed, such as birds.