Stan wrote this:
I had a friend once who explained the smaller carb thinking like this: if the venturi in the carb is not the choke-point for the intake, then your air-speed is not going to be great enough through the carb for fuel to be properly metered. In other words, unless your carburetor venturi is smaller than every other point along the intake (intake manifold, ports in the head, back of the valve, etc.), we're all fooling ourselves with bigger carbs. It makes perfect sense when you think about it, and has almost zero application in the real world.
And that it is spot on. That's what I found out with my recent carb "upgrade" - The carb venturii "choke point" was too big to match the rest of the engine flow so the entire system suffered. It's all supposed to be a matched system from air cleaner to exhaust tip and that sometimes takes a little figuring to make it all compatible because of all the variables.
I didn't like math, even though my Mom was a math teacher, but I found that it wasn't what math was doing that I disliked, it was the arduous plowing through the process. I was saved when they invented cheap, scientific calculators and then math became easy because the drudgework was done for me. I hesitate to say it is fun, but at least it's now a helluva lot easier.