ORIGINAL: skrilla
ORIGINAL: bigdogkanicsar
ORIGINAL: skrilla
ORIGINAL: bigdogkanicsar
i agree, humidity means moisture and when heated it creates a lean condition
It has been a while since I ran in very humid conditions, but I'm pretty sure that higher humidity requires the needles to be leaned some, so it in effect creates a rich condition, not lean
actually it's just the opposite. one of the first things i learned in basic engines was that water(moisture) when you spray it in the carb of automobile evaporates creating a lean condition. causing the combustion chamber temps to rise rapidly and break up carbon deposits in the engine. while that's automotive , there is no difference here. water when heated turns into a vapor(air) which causes a lean condition. therefore you need to richen the mixture to even out the addition of humidity(moisture+heat=air).
I'm talking about humidity, water already vaporized and in the air, not straight water. In the post you quoted above (by papy_yosh), he said the opposite of what you said, that the OP should lean the engine, hence the humidity creates a rich condition. You said you agree with him, but your statement contradicts what he said. I'm thinking if the air is full of moisture, then there is less oxygen available. When you decrease the amount of available oxygen in your intake charge, you need to compensate the fuel charge accordingly, which means less fuel, ie, leaner mixture. So, higher humidity creates a rich condition
As for spraying water in an intake, when it goes in and evaporates, it displaces oxygen, causing there to be less available oxygen, so less fuel is needed in the combustion chamber, so it pushes it in the rich direction. This is just my rationalization of it, don't claim to be an expert on the subject
Also, what do you mean by 'water when heated turns into a vapor (air)'? I know it turns into water vapor, something inflamable and useless in an engine, but 'air' implies simply that, air...oxygen, nitrogen, the stuff in the atmosphere.