The Rochester Monojet is a type of carburetor that was commonly used in older vehicles. The "power circuit" in this carburetor refers to the fuel delivery system that is responsible for providing the engine with additional fuel during heavy acceleration or load.
The power circuit consists of a power valve and a metering rod. The power valve is a spring-loaded diaphragm that senses when the engine is under heavy load and opens to allow additional fuel to flow into the carburetor. The metering rod is a tapered rod that sits in a jet and controls the flow of fuel through the circuit.
When the engine is running under light loads or at idle, the power circuit is not active and fuel flows through the idle circuit instead. However, when the engine is under heavy load, such as during acceleration or when towing a heavy load, the power circuit is activated and the power valve opens to allow additional fuel to flow into the carburetor.
Proper tuning of the power circuit is important to ensure that the engine is getting the right amount of fuel during heavy load conditions. If the power circuit is not functioning properly, it can cause issues such as engine hesitation, lack of power, or poor fuel economy.
