Re: What do you know about Hydrogen on demand ?
I had the same problem trying to figure it out. I have a Toyota motorhome with a 22R motor... they are everywhere so I used it for my test engine. Most people on the internet are just making the gas but have not put it in use. This is HHO drycell that is used as a supplement to gas or diesel fuel on internal combustion engines.
I have my HHO unit on a 1985 Toyota motorhome, two Harleys, four diesels (including a tractor-trailer), a 2007 Gulf Stream motorhome with a Ford V10, 2000 Dodge Neon, and also did a friend's 2002 Dodge truck... almost forgot my 1956 T-Bird. I'm not afraid to put it on anything. Every vehicle has a different reaction, the Toyota was going up a long grade 40-45 mph at 13 mpg. It could not pass anything... it would see the hill and slow down. It gave me enough power to shift up into fourth gear and take it to 65 mph and it gets 16 mpg. Thats more than a 20% increase in mileage, and LOTS more power. The Neon was 28-30 mpg... now 41 mpg. That's more than a 40% increase in mileage, but didn't gain any notable power. The Toyota I had to adjust carb fuel/air mix and I bumped the timing up (was able to put it at 3 degrees btdc and it never ran better... had to put it back to 6 degrees for smog).
All vehicles have been stock factory except one of the Harleys was bored and stroked to 95 c.i. and was a hard starter and lots of vibration. After the addition of HHO it started with a touch of the button and is much smoother running. Don't have good mileage numbers but lots of power and definitely increased mpg. Close as I can say, about 3/4 of a gallon less in 100 miles. Going through canyon roads used to constantly downshift and now can just leave it in 5th gear and roll the throttle on. Have the Harleys pulling 5 amps...they can't draw much. Very happy with power increase.
On a 30,000 lb. deisel box van it was hauling a lot of equipment and could only go 15mph over the pass. The other vehicles in the caravan would get home and eat dinner before that poor guy pulled up. Now, they call ahead and tell him to slow down cause they can't keep up...LOL. He was gonna retire that truck and let me put HHO on it just to experiment. Now it runs great and has no smoking issue anymore.
My units are producing up to 4 liters/minute at 20 amps. I use sodium hydroxide as an electrolyte...approximately 1/480 in distilled water. This ratio can be adjusted to whatever amperage you want to pull...more amps=more production.
Don't know much about the exhaust, but I haven't had an issue with the motor home at 25,000 miles of HHO usage. Still need more miles on vehicles to see long term effects. Tailpipes are clean with a bit of surface rust, but no real issue. Can have worse than that from normal condensation. I did pull the heads off the Harley after about 800 miles and saw that it was starting to scrub the head clean. It seems to get progressively better performance when adding the HHO up to about 5000 miles, then levels out. I think having more complete combustion in the cylinder keeps from accumulating buildup and will lessen valve issues as well as lengthen spark plug life. I know the exhaust temperatures are lower on the turbo deisel and engine running temp is down too. Exhaust emissions are also lower, and I have found a couple of smog guys who won't fail me on the visual with the unit in place...otherwise I have to disconnect the unit to have it smogged.
I guess I could go on and on...been doing it for a few years and just curious about other experiences. I just want to spread what I have found, and share with others.