Can someone explain

[Boltazar]

to me the reason why leaning out the gasoline to air in an engine raises the heat of the engine.

Adding HHO to an engine can only get better MPG if the oxygen sensors are altered. Any gain without o2 adjustment is minor compaired to what you could get with leaning out the gas.

My main concern is changing the timing to alter the early flash point of the hydrogen. Leaving the timming as factory defalt can't be rite. My reasoning is that the more HHO entering the engine the later the timing should be from factory defalt.

I'd love to hear other ideas on this

[EltonBrandd]

Leaning out the engine creates a very hot burn. when the fuel mixture is proper there as a little bit of unburned fuel that actually cools the combustion chamber. When HHO burns it creates water vapor and cools the chamber.