Where to Adjust the Carburetor for Fuel Efficiency?
2 Answers
When adjusting the carburetor, you can appropriately lower the fuel level in the float chamber, reduce the diameter of the main jet, and lower the main needle of the carburetor to actively decrease fuel supply, thereby achieving fuel efficiency. Below are specific methods for carburetor fuel efficiency: 1. Different methods: The main jet comes in two types—fixed and adjustable with a screw needle. For a fixed main jet, you can wrap one or two thin copper wires inside the jet to reduce fuel flow. For an adjustable type, first screw the needle all the way in, then rotate it counterclockwise about one and a half turns. The goal is to reasonably lower the mixture concentration while ensuring stable engine operation. The car should not experience jerking during acceleration or carburetor backfire. Multiple adjustments may be needed to reach an optimal level. 2. Throttle control: The throttle opening within two-thirds is the leanest and most fuel-efficient state for the mixture. When pressing the accelerator, the carburetor has a piston-type enrichment device that instantly sprays fuel, designed to enhance engine stability during acceleration. When the throttle is fully open, the carburetor opens a second fuel supply channel to enrich the mixture, allowing the engine to produce maximum power. Generally, try not to press the accelerator pedal all the way down to save fuel.
I've been driving an old carburetor car for over a decade, and tuning for fuel efficiency is an art. The key is adjusting the mixture screw, which is hidden on the side of the carburetor body. Turning it clockwise slightly increases air and reduces fuel, making it more fuel-efficient, but don't overdo it—otherwise, the engine will gasp and lose power, making the ride rough. You also need to check if the idle screw is properly set; a stable idle means better fuel economy. Regularly clean the throttle body to avoid carbon buildup and blockages. Fuel efficiency isn't just about tuning—drive smoothly, ease off the throttle, and avoid sudden braking. Overall maintenance is crucial: replace a dirty air filter and stick to regular servicing. Beginners should be careful when adjusting on their own—use a small wrench and make gentle turns, testing the car after each adjustment. If unsure, it's safer to ask a mechanic for help—it keeps the car running well and protects the engine.
