Ok, I usually just read the threads and this is the first one Iíve started.
After reading all the posts on water injection/induction I decided to try a test with the Fiero. I thought about trying one with my Jeep but Scott-Wa posted an excellent post about heated O2 sensors cracking and having issues with additional water vapor so I will stick to the Fiero which does not have a heated O2 sensor.
Iím not going to try for massive increases in mileage just maybe a couple percent. That may occur just from the cleaning properties of the water turning to steam and cleaning the carbon out of the engine. My cat is already hollow so that isnít a concern.
After reading this article: http://www.dave-cushman.net/misc/mannject.html
I decided to try something similar.
Since my 4 cyl duke has a vacuum operated EGR valve the vacuum supply increases vacuum as rpm increases.
I placed a ďTĒ in the EGR vacuum and placed an inline needle valve in the line. Then I placed the other end of the line into a water bottle. I used clear line between the needle valve and the water bottle.
After the engine was warm I opened the needle valve slightly. The vacuum at idle does not draw any water at all thru the line. I set the needle valve to allow just a small amount of water to flow through the hose starting about 1500 rpm. Then I set the valve stationary with some JB Weld epoxy (didnít want it to move).
After testing I placed a second needle valve in line as a shutoff valve. Everything Iíve read states very bad things (hydro lock) can occur placing additional water into a cold engine.
As I said Iím just testing here to try it out. The duke already gets pretty good mileage and if I just clean the carbon out it should help.
Just from the seat of the pants dyno it seems to accelerate just a tad better. Iíll run it this way for a while and see how it goes. This is my daily driver.
So is this risky? Thoughts about it destroying my O2 sensor?
The whole setup was under $10 so there is no real investment.