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Ford Engine Carburetors - Carburetors Explained

Getting Power And Making The Most Of The Fuel/Air Charge Begins Here
By Jim Smart
Photography by Jim Smart
Carburetor Adjust

Carburetor Holley
In over 100 years, carburetor basics haven't changed much, and the principle remains the same as in 1893 when the carburetor was invented. It is all about air flow, speed through the bores, and how each draws fuel from the fuel bowl. This is a Holley 4160 carburetor provided by MCE Engines of Los Angeles.
Carburetor Fuel Bowl
There has to be enough fuel in the fuel bowl to keep the engine supplied. The float and needle valve control how much fuel enters the carburetor. As the float falls with the consumption of fuel, it relieves pressure on the needle valve, allowing more fuel into the bowl. The float rises against the needle valve, closing off the flow of fuel to the bowl. In normal operation, float movement isn't even perceptible. It maintains a smooth flow of fuel into the bowl.
Carburetor Brass Float
This is a center-pivot Holley fuel bowl with a brass float. Brass floats are sometimes recommended because foam floats can take on fuel, sink, and stop doing their jobs. Brass floats can also leak when a solder seam gives out and the float fills with fuel. Each type has its advantages, and every carb tuner has a preference.

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