Also, from my research (no practical experience whatsoever). Lean burn likes a hot intake temperature 85 deg C. (On an hcci engine). Otherwise the lean mix does not burn. That was one of the things i wanted to try with steam injection. I could not find the canbus codes for MB so the project ran out of steam (pun intended). The steam heats up the intake air and condenses in to very fine droplets, these get sucked in to the cylinder and then suck up some of the heat of the lean burn.
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