Posted by CAP1
on most cars, the o2 sensor has nothing to do with oxides of nitrogen.
they're controlled by the egr systems, or by three way catalytic converters.
Nitrogen Oxide is caused by high flame temperature. High temperature combustion allows oxygen and nitrogen to fuse more easily than a low temp flame. Lean mixture yields a high temperature flame. O2 sensor keeps the AF mixture near 14.7, thus keeping the flame temperature down by staying away from the lean side of thee spectrum.
So the oxy sensor does play a part in nitrogen oxide control.
Further looking into (not easy, everything i found was on forums or sites of people trying to sell me something) it says it would only be useful (or safe) for cruising. even if it is the entire cause for his noticed improvements, his HHO setup supposedly decreases engine temperatures, this would make it safer for him to run a leaner mix.
OK Vorticon, Hornet’s system produces 0.0033 lbm / hr of hydrogen.
In that same hour, driving at 60 mph, and now getting 16 mpg,
16 mpg --- 60 mph --- yielding 3.75 GPH fuel burn
3.75 * 6.2 lbm / gal = 23.25 lbs gasoline per hour
0.0033 / 23.25 = 0.000143
0.000143 lbs of hydrogen per lb of gasoline is 1.4/100 of 1% by weight
JPL needed more than 100 times the hydrogen to make 1/3 the difference.
By the way this is all in an air flow thru the engine (at 14.7) of 342 lbs. That is 4600 cu ft of air blowing thru the engine every hour.
Do you really think the hydrogen bubbler is making all that much difference?[/b]
Here is an abstract of a paper from the American Society of Mechanical Engineers:
Proceedings of ICES2006 ASME Internal Combustion Engine Division 2006 Spring Technical Conference May 2006, Aachen, Germany
Enrico Conte Swiss Federal Institute of Technology
Experimental investigations were carried out to assess the use of hydrogen in a Gasoline Direct Injection (GDI) engine. Injection of small amounts of hydrogen (up to 27% on an energy basis) in the intake port creates a reactive homogeneous background for the direct injection of gasoline in the cylinder. In this way, it is possible to operate the engine with high EGR rates and, in certain conditions, to delay the ignition timing as compared to standard GDI operation, in order to reduce NOx and HC emissions to very low levels and possibly soot emissions.
The results confirmed that high EGR rates can be achieved and NOx and HC emissions reduced, showed significant advantage in terms of combustion efficiency[/i] and gave unexpected results relative to the delaying of ignition, which only partly confirmed the expected behavior.
A realistic application would make use of hydrogen-containing reformer gas produced on board the vehicle, but safety restrictions did not allow using carbon monoxide in the test facility. Thus pure hydrogen was used for a best-case investigation. The expected difference in the use of the two gases is briefly discussed.
27% on an energy basis. Hornet’s example is 0.0033 lbm per 23.25 lbs of gasoline.
That’s 0.0033 lbm * 55,000 btu/lb … 180 btu
180 btu for every 23.25 lbs * 18550 btu/lb … 431,288 btu gasoline
180/431,288 = .0004 ----
0.04% on an energy basisEnrico Conte found “significant advantage in terms of combustion efficiency”
using only 675 times more hydrogen.JPL had to use 120 to 600 times more hydrogen to make their efficiency improvement of 6 to 15%
Now we know we can change the fuel flow by adjusting the mixture from rich (12:1) to lean (17:1) and achieve 40% better fuel efficiency.
Occam's razor says that the most simple explanation is most probably the true explanation.
Either using much less than 1% of the hydrogen that NASA's Jet Propulsion Laboratory needed this system gets better than three times the results, and using 675 times less than Enrico Conte of the Swiss Federal Institute of Technology found necessary to show 'significant advantage in terms of combustion efficiency' this system achieves magnificent reslults, or like probably millions of people have found out since the invention of the internal combustion engine, leaning the mixture results in better fuel economy.
You might need to add around 1/2 liter a month. The water level in mine has only dropped about 6ml since I installed it, but I also have an automatic refill tank on mine so when the booster cools down and creates a negative pressure in the chamber it sucks fresh refill water from the tank through a one way valve. I used a plastic lab container that has ml measurements on the side, and so far I'm down by 6ml on the tank.
So water/mix per mile used is so small it really can't be measured.
6 ml... a far cry from the 27% by energy ratio Enrico Conte found.
I think driving habits and fooling the oxy sensor to create lean mixture are the most probable reasons for the mileage increase and the Hydrogen injection is just the misdirection of the magic trick.