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@ Frank, Thanks!
>>AFAIK adding hydrogen for increasing fe is done to help stabilize ultra-lean combustion >>mixtures for homogenous charge compression ignition schemes.
My reading tells me this, but not strictly restricted to diesel engines. It allows a certain degree of lean burn for petrol engines as well.
However, as I just replied to Old Tele Man himself, leaving aside FE gains, I wondered if the 'fringe' benefits alone were sufficient justification for having an HHO system.
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