Tuning the Carter Thermoquad Carburetor - TQ Dyno Dial Up!

TQ Factory Metering Rods and Jets
Factory metering rods are all numbered, but the problem is we know of no reference that lists the rod sizes. We have archived a list of the factory rods per the final blueprint specs from Carter Automotive Company. The specs compiled here provide the first comprehensive reference that we know of. These specs give the rod diameter at a glance, to make rod selection and tuning easier. A fatter rod plugs up more of the jet, reducing cross-sectional area, and thus fuel flow. Most TQ rods have three steps: economy, in action when under light throttle cruise; mid, under higher load or throttle opening; and power, high load and WOT. Remember, as soon as the throttle is snapped to wide open, the rod will instantly be up on the power step, no matter the rpm. Primary jets are also numbered, but last three digits of the number relates to the orifice size directly. For instance, a primary jet 4095 is .095-inch or a 4101 measures .101-inch. Similarly, the last three digits of a secondary jet equates to the size as a fraction of an inch. A 5110 jet measures .110-inch, while a 5143 measures .143-inch.