Effect of Air Density on Carburation

yellow rose said
They are essentially self adjusting.

I'm coming to appreciate this more and more.
Until a few years ago I would change the main jets for winter in my Barracuda.
Funny. Never needed to do that in any other carbureted vehicle I owned. I thought I was being more precise than the factories. Truth is, they knew better.
Shinker once posted that the choke towers help in proper compensation for changes in air because it helps keep the shelf the air bleeds are protected. Never got a chance to ask him to elaborate on that. :( Did he mean that as it sounds, or just as part of the reason sometimes jetting on race carbs needs to be adjusted for air.

mderoy340 said
Humidity also plays a role that I still haven't nailed down completely living in FL. Water molecules displace the amount of O2 in the air that a carb can suck in.

That and the high moisture in the air must change the combustion processes etc. Its many a time when an engine often seems so happy just when the public roads are slick. Always requires an extra degree of self discipline!