Quote:
Originally Posted by scalbert
Don't just link, expand and provide information. As I stated, yes, higher humidity does reduce the octane requirements. But that article does not suggest high humidity and water injection do the same thing. There are far too many negatives, which generally outweigh the octane requirement reduction, in high humidity; for instance, the greater heat abortion and retention, etc.
Water injection’s greatest benefit is that process of conversion to a vapor. This takes quite a bit of energy and that energy comes from the air. That reduces the air temperature. High humidity has already undergone that process and quite often, has absorbed additional heat in the movement across the earth.
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From the article..
7.12) What is the effect of humidity?
An increase of absolute humidity of 1.0 g water/kg of dry air lowers the octane requirement of an engine by 0.25 - 0.32 MON [27,28,38]."
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It is simply common knowledge that high humidity stabilizes timing values and reduces the octane requirement to a degree. I don't think anyone suggested driving around in 70% humidity is like strapping on a 10 GPH water injection kit
Mike