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Old 05-16-2011, 02:17 PM   #51 (permalink)
TheEnemy
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No, but in their conclusion,

2. Hydrogen addition would lead to higher NOx emission if spark timing is not optimized. Also, hydrogen enrichment was found to be not good for engine efficiency improvement at unchanged spark timing—actually it obviously dropped when 50% hydrogen was added in this study. Unburned HC emission always decreased with the increase of the amount of hydrogen added no matter whether spark timing was changed or not.

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