the steam in itself won't hurt the engine... Read up on some water vapor threads.. from what I hear, there's an MPG improvement from using water vapor alone... I personally haven't looked into it...
It's the KOH vapors that's bad for the engine (or at least the aluminum parts of the engine)... the important thing is to get the KOH Vapors out of the steam/hho....
But, as Lee said, go with a dry cell... Read, Read, Read, Read, Read some more... I've got a Smack Wet Cell in my van... I'm averaging probably 1-2MPG improvement with it... ONCE, I saw a 4mpg improvement... This is on a 12.5 MPG base line.... But overall, I get 13.5-14.5 mpg running the smack cell.
I've got 3 dry Cells Built, but just don't have the time to yank the smack out and install the Drys...
They're easy to build... Again, Read, Read, Read, Read, then, when you think you have it all embedded into your Brain, go back and Read some more... The info is there... the work is Easy, the parts are readily available...
96 E-250 4.9L, 100,000 Miles.
12.5 MPG Befor HHO
16.5 (Best) after HHO.
Modified Smack Gen I Cell.
85 BMW 524TD
26-32MPH
HHO Coming soon
A TOOL Is only as GOOD as it's operator. If the Operator DON'T KNOW How to work it, The TOOL WON'T WORK