WHAT ARE THEY AND WHAT DO THEY DO

The Carter WGD carburetor is a type of carburetor that was commonly used in American-made vehicles, particularly during the mid-20th century. The "WGD" designation stands for "W" series, "G" indicating a governor control (if equipped), and "D" for a dual barrel setup.

One of the key components of the Carter WGD carburetor is the metering rod. The metering rod plays a crucial role in the carburetor's function, as it helps regulate the fuel mixture. Here's a basic overview of how it works:

  1. Function: The metering rod is designed to adjust the fuel flow through the carburetor's main jet. It is connected to the throttle and moves in and out of the jet as the throttle is opened and closed. The metering rod is tapered so as the rod is pulled out of the main jet, more fuel in introduced.
  2. Adjustment: When the throttle is at a lower position (i.e., during idle or low-speed operation), the metering rod sits deeper into the jet, restricting the flow of fuel and leaning out the mixture. As the throttle opens (i.e., during acceleration or high-speed operation), the rod lifts out of the jet, allowing more fuel to flow and enriching the mixture.
  3. Tuning: The metering rod can be changed to different sizes and tapers to adjust the fuel mixture across different throttle positions. This is a common tuning practice to optimize engine performance and efficiency. Other than NOS, metering rods are no longer available.
  4. Types and Sizes: Carter WGD carburetors may have different types and sizes of metering rods, depending on the specific model and application. These variations allow for fine-tuning based on the engine's requirements.
  5. Maintenance: Regular maintenance of the metering rod and the carburetor as a whole is important for optimal performance. This includes cleaning and, if necessary, replacing the metering rod if it becomes worn or damaged.

Understanding the specifics of the Carter WGD carburetor, including the metering rod, requires a good grasp of carburetor mechanics and may involve consulting technical manuals or resources specific to the model in question. For detailed information, especially for restoration or repair purposes, referring to a service manual or a guide specific to Carter WGD carburetors is advisable.

ADJUSTMENTS

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The metering rods must be adjusted after the pump adjust­ment or when leaner than standard rods are installed. No metering rod gauges are necessary. Procedure is as follows: with the throttle lever set screw backed out and throttle valves seated in bores of carburetor, press down on vacu­meter link ( D) until metering rods bottom at ( E). With rods held in this position, revolve metering rod arm ( F) until lip contacts vacumeter link. Hold in place and care­fully tighten metering rod arm set screw ( G).