[oldbeaver]

Here are my results building and testing HHO systems in my car.

First, lot of people claim high gains with this system. Other people gave Thermodynamics explanations that concluded it is impossible to get power gains with the system.

This attracted me as I am a DIY kind of guy. I decided to build my own system.

I constructed two HOH systems myself.

First system:

The first followed the plans sold in the Internet. It consumed 30 A and produced bubles . However, rpm of the car slowed down when connected. This means it took more energy from the car (through the battery) than the energy it added as HOH gas combustion.
The engine was a Nissan aspirated diesel of 1996.
Additional problems: the system warmed up a lot, then the current consumption overflow the ammeter capacity. The stainless steel used here corroded after three loads of NAOH solution.
It was impossible to run a complete tank of diesel as water evaporated.

Second system:

Then I decided to construct a second system, following instructions of an engineer from the Internet. Then I used a special, very hard, very heavy, very expensive stainless steel.
Making holes broke my tools ten times here.
After assembling and installed in the car, this system produced about five times more HOH gas, and used only half the electricity from the battery. So it was 10 times more efficient than previous system.
However, even though, when connected the engine slowed down, so there was a negative gain of energy too. If it was producing more bang the engine would have accelerated.
Additional problems:
Water didnn´t evaporate so quickly, but production of gas was so much that I had to attach a 12V pump to blow solution to the bubbler. Otherwise, gas becomes to push down the gas in the electrolysis device.
I wanted to sell this device to a truck transport company, but as it didn´t increase power, it wouldn´t increase fuel miling too.
It was impossible to complete a full tank with this system too, not because evaporation or consumption of water, but for foam formation, due to the pumping.

Conclusion: This do not work as claimed by sellers. At all.

I have pictures of the seond system and the system itself.

Oldbeaver