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This video is super awesome, finally made an account + logged into desktop to say so. (!)

I studied eng, work as a swe, and also do-my-own engine work. Have never worked on a carb'd automotive vehicle, just some smaller marine 4 stroke outboards. I've always thought, when cleaning a carb., "I know what it does but not how it is done." This video makes it crystal clear - even seeing the float oscillating to the strokes.. - is so so cool.

There's even some solid music played during the slo-mo bits. Thanks for posting and cheers to the folks who made the video

What I want to know is how does one engineer a carburetor without seeing it work in real life like this vid? I don't think they had fancy fluid sims when they we're designing them. Like even slight changes in how the fuel vaporizes and mixes could be huge for efficiency.
It was probably achieved through time. This is the most basic carburetor you can make, but one can quickly come up with improvements just by watching the video. I’m sure lots of ideas failed or were not possible back in the day
At one point in the video someone says something like, "nobody really 100% knows how a carburetor works, right?", which was funny.
The video is made by Destin, the Smarter Every Day guy. So, yeah, it's worth watching.

But with modern cars injecting fuel directly into cylinders, and with EVs just about here, carburetors are now closer to "history" than to "science". :-)

Almost yeah, but there are still lots of carburetor engines, like lawn mowers, bush-cutters, chainsaws and other small machines, and also a lot of (older and retro style) motorcycles use them.
This is cool. We finally have verification. The Venturi doesn't suck the gasoline into the engine. Gravity feed (or fuel pump) pushes the fuel into the throttle body. Venturi causes the flow to must and properly mix. Which should be obvious because a stuck float bowl causes flooding.