DIY Water Injector System? Will this worrk on EFI?

[xfreemanx]

I found this on the NET:
http://journeytoforever.org/biofuel_...earth/me3.html
Any comments on this?

Its a DIY. Would this work on a corolla 4aFE engine? I have rigged it up to mine, and nothing bad is happening yet, but I did note having a slower RPM on the hiway with the same acceleration...still observing. its too early to tell...

BTW, I placed the T connection in series with the vacuum line that goes to the air manifold. Its the left most tube at the back side. Not sure where its connected. Any ideas?

[toyotaspeed90]

there is no point to try and cool the air by using a water injection on a naturally aspirated engine.... if anything you will just be replacing volume of air with water and you may see a decrease in power.... it is used with forced induction because superchargers and turbochargers heat up the intake charge quite a bit

[Flashmn]

No point.

[xfreemanx]

Thanks toyotaspeed90. I found a similar site which says the same: "Water injection systems are predominantly useful in forced induction (turbocharged or supercharded), internal combustion engines. Only in extrem cases such as very high compression ratios, very low octane fuel or too much ignition advance can it benefit a normally aspirated engine. The system has been around for a long time since it was already used in some World War II aircraft engines. "

There's another interesting discussion from Aquamist though:
16. I have a normally aspirated car, would water injection help me to obtain more power?

No, in general. Unless you decided to increase the compression ratio, more advance ignition or run lower fuel grade than recommended by the manufacturer.

17. How do I advance the ignition timing?

Cars manufactured with knock sensor will automatically run more advance timing in the absence of knock. It is difficult to advance the timing on car without a knock sensor built-in.

18. My normally aspirated car suffers with sever detonation problem under heavy load such as towing, would water injection cure my detonation problem?

Yes, water injection will minimise the onset of detonation or even totally eliminates it, but you don't necessarily need to use the Aquamist system as high water pressure is not required, a ten-dollar washer pump and a water jet will work jet as well. Pay careful attention to prevent water from siphoning through the water pump during idle, a similar inline checkvalve will do the job.

19. Would water injection help to improve the economy of my normally aspirated car, ie more mpg?

Water injection will enable you to run more ignition advance so you can achieve MBT timing (Maximum brake torque) thus improve the efficiency of the engine, mpg will increase as a result but you need to carry a lot of water on board...

CASE IN POINT: A naturally aspirated engine can benefit from water injection too, albeit some caveats. My experiment is still ongoing anyway. If it doesn't work, no prob, it's gonna be easy to throw it away.. !