Links worth review and where the quote came from:
http://www.aardvark.co.nz/hho_scam2.shtml http://www.aardvark.co.nz/hho_scam.shtml
...And another worrying aspect of these HHO conversions has been brought to my attention...
All of those who are *actually* seeing a small improvement in fuel efficiency after fitting one of these kits have one thing in common.. they've messed around with the O2 sensor in their engine. The rationale here is that the extra oxygen from the electrolysis is causing the O2 sensor to return a reading that will cause the engine computer to increase the amount of gasoline injected -- so the O2 sensor should be disabled or adjusted to compensate.
This is utter rubbish. The O2 coming from the electrolysis cell will be totally consumed when it oxidizes the hydrogen during combustion.
What happens when you fool with the O2 sensor is that you trick your engine computer into forcing your engine to run lean -- far leaner than it's designed to run -- and that's bad.
Yes, you *may* save a few dollars per tank in fuel costs but you'll pay dearly for it a little further down the track in the form of burnt valves and damaged piston-crowns.