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Ok let me try to explain this a little more.
First there is no car that can run purely on HHO/Water. If there is someone who claims this, I have my doubts..(this would be a pure deviation from the laws of thermodynamics and it is not possible anywhere on this planet)
However, you must also keep in mind that HHO is far more efficient than gasoline or diesel.
1) The energy content of Petrol is approx 47Kilo Joules / gram by weight. When compared to HHO it is 141 KJ/gm.
2) The flammability range of HHO is 75% as compared to 6% in case of Petrol. Also keep in mind that the flame travels at Mach3 which also speaks of the importance of safety devices like flash arrestors and bubblers..
3) The octane rating of HHO is 130+ (and this is considering a lean mix), the same for petrol is 87-93
4) Ignition energy of HHO is far higher than Petrol
5) The burning speed of the HHO flame is much higher than Petrol, and to make matter worse, when HHO burns it is invisible
6) Gasoline or Petrol as we more commonly understand it in India, is composed of a mixture of many different hydro-carbons, but an important constituent is heptane (C7H16). Others like LPG/CNG/Ethenol / Methenol etc are even less volatile when compared to Petrol. HHO will expand almost "1800 times" more than Gasoline / Petrol
Now to cut the long story short, we need to add just a little amount of HHO into the main-stream. If the amount of HHO entering into the engine is small volume then in that case no major modification is required and a straight tap into the air intake will do the trick, however all depends upon the efficiency of the cell you have designed and how close it is to the faraday's principal. On the other hand if you design a cell that generates above 5mmw then you need to modify the engine to shift the TDC else there will be stupid knocking and other issues. It is best to stick to 4-5 mmws
Now to answer your question, yes the best shot I got with my wagon R on a few occasions in past months is 29 (Twenty nine) KPL but this is not always the case. Usually my average ranges anything between 19-22 KPL and I am talking city driving conditions. I live in south Delhi and my work place is DLF Silohera, so take into account that this is a bit better than normal city driving though not highway driving, I wish. But can you dream of getting 20KPL even on the best of the tuned Wagon R??? Also my several tests on highway show the best result on highway still remains at 29KPL and that makes me believe that perhaps my cell can still be improved upon.
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