Roadcuda
Well-Known Member
I hope you guys don't mind if I ask a question about the Carter 3854 carb with the Commando 273 my '65 Barracuda. I have some idea on how the idle mixture screws work, controlling the amount of air that's mixed with the gas, and how to adjust it. If I'm correct these screws affects the amount of gas that the carb lets through and which I believe affects how much gas the car uses. But I haven't found in any of my books, including the Carter Carburetors book, on what the By-pass idle air adjustment screw does and what to look for when adjusting it. Do I have to adjust it along with the mixture screws, separately, or not at all? it's the large copper screw between the mixture screws. I ask this question because so far I'm only getting about 12 mpg in this car,( using a light foot,) while my '64 with same setup can get 15, or better sometimes. I know, these cars weren't built for gas mileage, and we are all aware of what gas is going these days, so I'd like like to get the best I can out of them. Thanks.