06-02-2004, 06:52 PM
I say that some of the gas will become gaseous as it hits the vaccum. In a carburetor theres really nothing to atomize the fuel, it just kind of bleeds out of the jets into the venturi and splatters in the airflow and vacuum.
You ever seen an accelerator pump squirt gas like a waterpistol when you pump the gas? It doesn't really atomize fuel. Thats the vacuum's job. When people say that a carburetor atomizes fuel, it does, indirectly.
Now a Fuel injector will atomize the fuel.
What a choke does is create an artificial pocket of high vacuum in the carburetor.
1. the choke butterfly closes
2. now, instead of a very low vacuum in the venturi, there's a mega dose of vacuum in the venturi up 15-22 lbs that the manifold vacuum supplies.
3. Since the airflow can't get in, the vacuum will suck fuel instead of air from the little jets.
That's the way I've always understood it.
I copied this from howstuffworks
"Similarly, the boiling point of the fuel is greatly reduced by the vacuum in the intake manifold. Fuel vaporization is a result of several factors, including intake manifold vacuum, atmospheric temperature, fuel temperature, and intake manifold temperature. "
You ever seen an accelerator pump squirt gas like a waterpistol when you pump the gas? It doesn't really atomize fuel. Thats the vacuum's job. When people say that a carburetor atomizes fuel, it does, indirectly.
Now a Fuel injector will atomize the fuel.
What a choke does is create an artificial pocket of high vacuum in the carburetor.
1. the choke butterfly closes
2. now, instead of a very low vacuum in the venturi, there's a mega dose of vacuum in the venturi up 15-22 lbs that the manifold vacuum supplies.
3. Since the airflow can't get in, the vacuum will suck fuel instead of air from the little jets.
That's the way I've always understood it.
I copied this from howstuffworks
"Similarly, the boiling point of the fuel is greatly reduced by the vacuum in the intake manifold. Fuel vaporization is a result of several factors, including intake manifold vacuum, atmospheric temperature, fuel temperature, and intake manifold temperature. "