![]() To differentiate between low and high load, Holley created what is called the power valve circuit. This entire system is calibrated by the main jets, the high-speed air bleeds, and the emulsion holes in the metering block. The fuel and air is pushed out of the main well and into the boosters where it enters the incoming air. This is where precisely-drilled holes (called an emulsion circuit) mix air with the fuel. This vacuum signal allows atmospheric pressure pushing on the fuel in the float bowl to flow through the jets and then into the main well in the metering block. This signal is lower pressure, created by air rushing past the boosters (think back to high school and Bernoulli’s Principle). The main metering circuit flows fuel where there is a vacuum signal in the venturis. Once we know that, we can then figure out how to make it work better. ![]() But before we get into the fun part, let’s first run through how the main metering and the power enrichment circuits function. This month’s approach will offer even the most basic Holley tuner some ideas on how to make his or her engine make great power while running as efficiently as possible. ![]() It all depends on how deeply you want to dive into the carburetor. Holley engineers have created several tuning avenues through the modular design, to create a proper air-fuel ratio pattern for just about any engine. Tuning Holley carburetors isn’t difficult, but when it’s time to get into fine-tuning your street car, adjusting the fuel curve is a great path to travel.
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