I'm putting a new 2 bbl carburetor on my 273 65 barracuda, it has 2 adjustment screws on the front I'm guessing one is air & one is fuel...any recommendations on where to start with my air and fuel screws... I'm like a first grader walking in to 12th grade when it comes to carbs. I know and understand very little about them.. any advice would be great...
If it's a new carb,
then it is highly unlikely that BOTH idle-mixture circuits are bad. That leads me to think the fuel level is wrong or the idle timing is retarded.
So
by now, that carb is all messed up.
Remove it and drain it.
Make sure the choke blade is hanging vertical, and the fast-idle cam is disengaged. Fix the cam so it can't move.
Screw Both of the mixture screws all the way in until lightly seated; do not force them. Then back them out 2.5 turns. And leave them alone.
Flip the carb upside down. Go find the transfer
slots, at the bottom (now top since it's upside down), of the bores, on the front side. They are the only matching slots one in each barrel, in there. Using the curb-idle screw on the drivers side, adjust the "speed" until the slots appear to be square. After this,leave them alone.
Ok put the carb back on. I'm gonna assume,for now, that the float level is ok. Hook the throttle back up and with it's throttle spring anchored. Do not hook up the Vcan. Instead, put the hose on the sparkport and plug it. Do not hook up the choke at this time.Make sure the choke blade is still hanging vertical, and the fast-idle cam is disengaged.
Now remember; Do NOT touch any screws !
Start the car and pull in some timing until she hits about 600 to 700 and let her warm up.
After she is warmed up,
Using timing; I want you to learn something. Pull in the timing a lot, watching the rpm go up up and up. Stop when the rpm stops rising. Now retard the timing until the engine wants to stall. You see how far that stinking distributor moves?! And the engine keeps on running. You can set your IDLE-timing anywhere in that range that you want to; I don't pay the spec book no mind.
OK, schools over;
now, using timing set the rpm to about 550/600. Then set the brakes and put her into gear. If it doesn't bang into gear, and the rpm is above 500, and it idles smoothly in Park,you are done; park it, kill it,and take a break.
But
If it does not idle smoothly;
DO NOT TWIDDLE ANY SCREWS OR TIMING.
Instead; Come back and report. If you do twiddle, you might have a hard time finding someone here to help you, cuz the first thing I'm gonna ask is; "did you twiddle anything?", lol. I have no way of proceeding if you changechit., and I don't want to be the guy chasing my tail.
If you do anything while waiting; let it be a valve adjustment, and followed by a compression test. Write the numbers down!, grasshopper,lol.
