Edelbrock Carb adjustment

[jetfixr]

OK, finally got my crate motor in. Now I am in the process of getting my TV cable set for my 700r4. I am re-using my edelbrock 1406 from the old motor. It is running rich as hell but I have no idea how to adjust it (lost the manual). The idle adjustment for the linkage is pretty obvious, the only other 2 adjustment screws I see are the 2 big screws in directly in front of the forward barrels. I have no idea what each of them do, or how they should be adjusted. Can someone give me the quick-and-dirty on this?

[thisolechevy]

o.k. here is how to adjust your 1406 (or 1405 manual choke) set your RPM at 850-1000 then back off the two front screws starting on the right until the engine idles the highest on each screw. After your motor is idleing at the highest RPm the screws allow TIGHTEN each screw 1&1/4 turns. Then set the engine idle RPM where you like (usually 650-800) mines at 700. It should run alot smoother for you, but if this doesnt work right let me know and I will give you further instructions.
brad

[QKENUF4U]

hmmm thats bass akwards to what ive always been told to do with these type carbs. i have always turned them IN till the motor starts to stumble then back them out a turn or so

[thisolechevy]

hmmmm I have always taken them out let me check my edelbrock manual....ok the manual says to adjust each screw until reaching the highest rpm...so I guess either way tighten or loosen will work. I have always had to loosen

[GMan69]

I may be totally wrong, but I believe the screws on the front adjust idle mixture only. If you want to change the mixture for cruise or power, you will need to change primary metering rods and/or primary and/or secondary jets. This is easy to do on Edelbrock carbs and can be accomplished without removing carb from intake. Go to edelbrock.com and find their instructions for tuning/ calibrating the Performer series carburetor. Hope this helps.

[danho]

Here.

http://www.edelbrock.com/automotive/index.html

[ezernut9mm]

man, this place rocks! another question answerd and i didin't even have to ask it.

[Cat Fuzz]

Originally Posted by GMan69

I may be totally wrong, but I believe the screws on the front adjust idle mixture only. If you want to change the mixture for cruise or power, you will need to change primary metering rods and/or primary and/or secondary jets. This is easy to do on Edelbrock carbs and can be accomplished without removing carb from intake. Go to edelbrock.com and find their instructions for tuning/ calibrating the Performer series carburetor. Hope this helps.

This is correct. The trouble is finding the right rod/jet combo. I just bought a Strip Kit with bunches of rods, jets and secondary vacuum springs. If its running too rich, you need to reduce the orifice size of the jet. You may have to change the jet, rod or both to do this. And OMG be careful removing and reinstalling the bowl cover screws. Don't ask, I'm trying to block out those memories.

[dave3156]

I just bought a new 1406 with automatic choke. The literature says the carb comes factory adjusted and should need no further adjusting. Seems like the idle is too high to me. When I first start it and its in high idle before I release it by kicking it down, its so high it about wakes up the neighbors! Even after kick down it still seems too high. At idle it seems like its racing a bit. Has anybody bought one of these and not had to adjust anything, or is the literature making it sound too easy?

[68w/sbc406]

Originally Posted by Cat Fuzz

This is correct. The trouble is finding the right rod/jet combo. I just bought a Strip Kit with bunches of rods, jets and secondary vacuum springs. If its running too rich, you need to reduce the orifice size of the jet. You may have to change the jet, rod or both to do this. And OMG be careful removing and reinstalling the bowl cover screws. Don't ask, I'm trying to block out those memories.

i did that with my straight 6 carb, all the sudden, damn where is that screw? the good thing was i could still see it down in the carb, nothin a magnet couldnt fix

[RON WOODGEARD]

Originally Posted by dave3156

I just bought a new 1406 with automatic choke. The literature says the carb comes factory adjusted and should need no further adjusting. Seems like the idle is too high to me. When I first start it and its in high idle before I release it by kicking it down, its so high it about wakes up the neighbors! Even after kick down it still seems too high. At idle it seems like its racing a bit. Has anybody bought one of these and not had to adjust anything, or is the literature making it sound too easy?

The literature is making it sound too easy!!! You're going to have to do some adjusting on 8 out of ten motors..

The two screws on the front of the Carb. are idle circuit adjustments only.

Anyone who has one of these carbs should have the "STRIP KIT" it's essential for tuning...

I didn't go to the link Provided, But Catfuzz has it right.. If it isn't too far out of whack, You can get by with just removing the 2 small plates on top of the carb and changing the metering rods, but you MAY have to change the jets to a smaller size, if it's too rich.

If you have a "AIR FUEL RATIO GAUGE" that's where the different sized springs will really come into play in tuning throughout the RPM range under power in actual driving conditions. Or a dyno if you're fortunate enough to access to one..They will control when the rods raise and allow more fuel to run through the jets. and you can tune them "By the seat of the Pants."