MadScientist

As a system that uses electricity that the bike is throwing away and then taking that byproduct to improve combustion I find it very intriguing.

The bike isn't throwing away electricity. The load on the engine from the stator is the resistance of the system attached to it. As you draw more amps, the stator will be harder to turn, using more fuel.

If this is the case, the only way that you will get any energy back from this type of system would be if you increased k (the reaction rate) to a point where the energy gained by more efficient combustion (reaction in the cylinder) would offset the energy lost to power the electrolysis cell.

Being a chemist (though more into the biochemical aspects rather than physics/thermodynamics) I understand the principals here, though the system is slightly more complex than throwing LeChatlier and the laws of conservation at it.

We Have:

1) Excess oxygen to begin with (more hydrocarbons than stoich.)

2) A power source that shunts waste energy to heat (stator->R/R)

3) Inefficient extraction of energy (loss as heat or incomplete reaction)

4) Fuel injection system that will deliver a quantity of HCs independent of what is in the gas phase (air, HHO)

You are adding:

1) More oxygen (since you are not pressurizing above atmospheric -that I can see- this will displace air that is ~18% oxygen with HHO that is 33% oxygen at best (complete electrolysis))

2) Hydrogen (which is also a combustible fuel, already in the gas phase)

3) Water?

Possible Outcomes:

1) The oxygen and hydrogen recombine upon ignition and create water vapor (gas phase). This may occur before any HC fuel has a chance to react with the added oxygen. This would do 2 things:

The benefit to this is that the increasing the temperature increases the reaction rate (Arrhenius equation) no matter what order the reaction. This is good, but the amount of energy you add will be less than that generated by the rotor/stator.

2) (Unlikely, but possible) The added oxygen is present long enough to react with HC fuel. - This only applies if the HC combustion is at least 1st order in oxygen (I would guess it is). Thus more reactant = faster reaction...

3) (Bad News?) The HHO system delivers mainly water vapor (or some other non-combustible vapor?) Sure this might expand a bit, but nothing like water injection.

Now I didn't go looking up the reaction rate equations/constants for any of the combustion reactions that are taking place (well, what did you expect for free) so most of what I figured is just assuming that the reactions are 1st order in all species.

What I am curious about is why wouldn't they use a variable field exciter like an automotive alternator? Seems like a lot of energy to dissipate continuously as heat.