Edelbrock Performer Series Carburetor
Complete guide to set-up, tuning, and performance jetting
Most magazine adds would have you believe that by simply replacing your stock carburetor with a "performance" Holley or Edelbrock carburetor will result in huge horsepower gains and turn your stock engine into a fire breathing street machine. Now it is true that stock carburetors are a compromise between economy, drivability, and performance, but in most cases that "bolt on" carb upgrade will actually decrease power along with even a larger reduction in gas mileage, not to mention hesitations, hard starting, and great frustration. But by simply spending a little time and logical effort you can get the results those magazine adds promise. There has been a lot of information and books written on the Holley Carburetor but it is very difficult to find anything on tuning the Edelbrock (Carter AFB) carburetor,
Although Edelbrock claims the "Your Edelbrock Performer Series carburetor was calibrated .... in most applications you will not need to recalibrate your carburetor." I would disagree and highly recommend that you take the time to thoroughly read this information and recalibrate your carb, you will be astonished by the performance difference. The manual that comes with the Edelbrock Performer Series Carburetor is excellent, much of the initial information provided is from this manual, but more can be gained by taking the tuning a step further.
Before you even begin jetting it is critical that the carburetor is the correct size for the engine you are installing it on. The two biggest mistakes made are; installing a carburetor that is too large, bigger is NOT better; and then running too rich a mixture. Carburetors are relatively simple fuel/air mixers that rely on airspeed to create a pressure drop to "draw" and mix the fuel into the air stream, a carburetor that is too large can result in an air speed too low so that the fuel is not meters correctly and remains as droplets that do not mix or atomize with the air. The end result is an engine with lower power and poor throttle response. A carburetor that is too small will restrict airflow limiting engine power and speed at higher rpm's.
The Edelbrock Performer series carburetor is a redesigned and refined version of the Carter AFB. Fuel metering is by means of main jets and stepped metering rods, this combination allows for fast and easy calibrations that can be tailored precisely to your engine.
The following consists of 3 sections; Section 1, Theory of Operation which will provide an understanding of how a carburetor works, and the functions of the various circuits. Section 2, Tuning Procedures will take you through the Edelbrock step-by-step procedure which will enable you to achieve a relatively close calibration for your particular engine set-up, this is as far as most people go. Section 3 Power Tuning Procedures will outline the method for optimizing the carburetor's potential, taking the tuning procedure that one step further.