Postby labsy » Sun Feb 01, 2015 6:21 pm
A bit old topic, but maybe interesting.
I just installed HHO kit on my 2006 Pathy (2.5 dCi diesel) and the results are here:
- absolutely no mpg increase
- approx. 10% increase in power (HP) and torque (Nm)
- white steam/fog/smoke from tailpipe when engine is cold
- a bit smoother running diesel, but that might be my perception
I put a lot of research into HHO assembly design, so I purchased quite an inexpensive dry HHO cell generator, a bigger water reservoir than recommended (recommended was 1,2 liter, I bought 3 liter), an improved bubbler and dryer and a bunch of one-way check valves.
The main reason I bought bigger water tank is not in the quantity of water/electrolyte I want to carry around, but in extra space on top of reservoir. I still put only 1-1,5 liters inside, but I have plenty of room inside reservoir on top, so I put quite a lot of stainless-steel wool in the top 1/4 of reservoir. That's because I don't want HHO foam, bubbles and electrolyte to splash the output tube on every bump I drive.
Bubbler was also redesigned by me. First off, I used stainless-steel wool again on top of bubbler to prevent output hose splashing, and fine drilled input hose to produce a large quantity of small bubbles instead of big ones.
Inside I used 1/3 Isopropyl Alcohol (rubbing alcohol) mixed with 2/3 of water to prevent freezing.
At first I had problems with electrolyte filling my hose from main reservoir to the bubbler, but I solved this by installling bigger (3 liters) reservoir.
The second problem was backflow from bubbler to main reservoir when whole system was cooling town from each driving. Vacuum created by cooling down sucked the fluid from bubbler back to reservoir.
I first tried by installling one-way valve between them, but that did not help - obviously vacuum was too strong.
The fix was installing a one-way release valve on tube from main reservoir just before the bubbler, with one end connected to the tube and the other in the air. I turned it so it can suck-in, but cannot blow out. Right the opposite of blow valve. So when system is cooling down, both the bubbler and main reservoir can suck fresh air from outside without fluid flowing from one to another.
HHO part of the system produced a lot of HHO gas, it was clean of vapours (important!) and I noticed instant increase in engine power. It was also clearly indicated on my OBD2 measuring equipment (174 HP raised up to 192 HP). But mileage sticked to exact value of prevoius - no change.
I am playing around now with potentiometers connected to MAF sensor, which definitelly does regulate engine power from 100% down to unusable where I can hardly make 2500 revs. I tried let it settle down with a value, where power decrease is not perceptable, but still no mpg change.
Quite a dissapointment, but I am not finished with the project. Will try to fine tune it with some help of my tuning guyz and report back if any change.