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any lean burn motor make too much nox. ford tried to put a 30 to 1 lean burn in their taurus. they could not get the nox even close. the way they do nox is to cool the burn so the nitrogen in the air is heated less. for mpg and power a hot burn is needed. hydrogen can be used to fire a very lean mix. and that's a lean burn motor. water injection would cool the burn but would not met fed rules. and messing it up or down makes the engine check. light come on .in the latest op (whatever) 2 engine management.
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