Comments by "crazypj" (@1crazypj) on "AMAZING 35% More MPG with HHO? Let’s find out! Help with high gas prices?" video.

I think any 'improvements' would only apply on engines without O2 sensors? It looks like fuel injection is seeing a lean mixture or 'higher' air density so adding fuel giving worse fuel efficiency.
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@GSimpsonOAM Your missing the point I was trying to make. A carb will deliver fuel based on airflow BUT fuel injection has oxygen sensors that monitor amount of O2 in exhaust gas. If 'brain' finds too much oxygen it adds more fuel. A carb CAN'T do that so will in effect run slightly lean with the same sized jets. O2 sensors are very simple devices that monitor voltage between 0.1v and 0.9v in reality even though theory says 0 to 1. If you ever want to test operation use a propane 'torch and you will get odd readings as it is a different fuel to where O2 sensor was calibrated but you can still see voltage or resistance changes (depending on type of sensor) Early fuel injection systems may not have had O2 sensors ( 1980's and earlier) but everything more modern will have at least one sensor
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@wed110197 If you check flame speed, HHO is hundreds of times faster than gasoline so even if there isn't an O2 sensor (mentioned by someone) there may be a knock sensor causing fuel to be added to slow down the burn? HHO should make burn more complete although there are other cheaper ways to get same result. Exhaust gas would be measured during development with a specific CO, CO2, NO, and unburned hydrocarbons. Feeding HHO will change the values expected by any monitoring system
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@w1ndexcheese I was a motorcycle tech and motorcycle instructor not a chemist of physicist but understand what your saying. It's been several years since I did any research on HHO and my conclusion at the time was it wasn't worth the effort. The theory is, Browns gas having a faster flame front plus a more complete burn will ignite fuel that otherwise would go out the exhaust as un-burned hydrocarbons. Maybe it was true in the 1940's,50's,60's when combustion chamber design was pretty poor but a modern industrial engine (almost any gas or diesel engine) is designed for specific operating rpm efficiency and in my experience pretty good at doing so (I also worked on various diesel and stationary industrial engines for 8 years) EPA is indirectly responsible for normal production engines now producing well over 100BHP/litre (often closer to 150bhp/litre normally aspirated and much higher with forced induction) If you can burn 'all' the fuel in a given cycle you often use less or get a higher output with the same amount as an earlier design. (although Nitrogen compound levels get much higher when combustion temperature increases-acid rain?) Even into the 1990's it was thought 75/bhp/litre was 'good' and 100'bhp for 'race' engines only (or 1hp /cu/inch in USA.) Due to design improvements, even those numbers can easily be ' beaten' by 1960's designs which were often pretty bad being made for ease of production rather than performance.
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@hoss3433 Yep, I've watched the documentary video about the inventor. I believe you can also fit a resistor to change the values from O2 sensor although I've forgotten how to work out the values required.
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@Discretesignals no idea what you mean? O2 sensors supply between 0.1 and 0.9 volts to ECU depending on amount of O2 in exhaust gas.(although in theory, between zero and one volt) They are either 2 or 3 wire although I haven't seen a 2 wire in years. Electronic fuel injection will probably be part of full ECU setting ignition timing, rpm, etc (as sensors have become 'smarter' and 'faster' probably monitoring other functions (been available since at least 2010 on small production motorcycles/scooters, one sensor covering what took 3 previously, TPS,MAF,IAT)
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