by Cave's OSC » Fri Apr 16, 2021 9:27 pm
OK, let's have a little physics lesson. A venturi is a round ring. If it was flat and you took a side view it would look just like a side view of an airplane's wing. It's the Bernoullli's principle that works with fluids, and air. Anytime time you increase the speed of the air, the pressure is reduced. Thus by the pistons moving up and down, sucking in air through the carburetor the speed of the air coming in is further increased because it flows over the 'wing' of the venturi. The lower pressure sucks the gasoline up through the carb's jet and up the nozzle into the air stream of the air going into the cylinders, now a mixture of air and gas and the rough interior of the manifold and cylinder casting causes the turbulence the air and gas mixing it further, and if the jet(s), nozzle, venturi, and volume of air, (bore, stroke, valves, can get a 7 to 1 mixture, and the back flow of the pipes and muffler cause the proper amount of burned fuel molecules to stay in the cylinder to mix with the incoming air and gas enabling the volumetric efficiency to be at it's power ratio for it's best out put of horsepower, well then you have a well running engine.
It is important to put the correct venture, jets, and nozzle combination for this to work. The length the the correct nozzle for the venturi, or bombsight venturi is important! The belief that the center of the carburetors airflow is somehow less or the the pressure is higher in the center is in the realm of wing tunnel engineer's with bachelor's in calculus. Let the fireworks begin.