Suppose I was tuning my carb by changing the jets and it was 70 deg, and all of a sudden it got 10-15 deg cooler. Would I jet up or down for max power? I'm thinking up since the air is denser when cold. I know this isnt probably worth much, but I dont have my carb where I want it anyway, so I was looking for a little direction.

MaTt

There are more factors than temperature, like humidity and barometric pressure.

[This message has been edited by onovakind67 (edited November 25, 2004).]

You need to run slightly bigger jets in the colder weather as the cold air is denser and requires more fuel to keep it from leaning out. This is why you can make more power in cooler weather.

<font face="Arial,Verdana" size="2">Originally posted by Tokyo Torquer3:
You need to run slightly bigger jets in the colder weather as the cold air is denser and requires more fuel to keep it from leaning out. This is why you can make more power in cooler weather.</font>


And why cold air indiction systems (ie. cowl induction hoods) work.