Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: 340SHORTY]
#1321547
10/17/12 12:47 AM
10/17/12 12:47 AM
|
Joined: Dec 2007
Posts: 18,160
Mass
DAYCLONA
I Live Here
|
I Live Here
Joined: Dec 2007
Posts: 18,160
Mass
|
Quote:
The mixture screws are set when new on the outboards. Thats why they have lead plugs in them. DONT mess with them.. 
That's like saying don't remove the "Do Not Remove" tag from a new mattress 
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: 1_WILD_RT]
#1321549
10/17/12 01:20 AM
10/17/12 01:20 AM
|
Joined: Jan 2003
Posts: 3,686
South San Francisco, Ca
70sixpkrt
master
|
master
Joined: Jan 2003
Posts: 3,686
South San Francisco, Ca
|
Quote:
The outer ones,also be very careful with the screws.If they have never been adjusted you may have a problem,the cork seal turns rock hard over the years and it is "VERY" easy to break one side off the screw head.Probably 3/4 of the carbs I get have at least one broken screw and usually more.
I would adjust the outboards 1/2 out from seat position.
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: 1_WILD_RT]
#1321550
10/17/12 01:26 AM
10/17/12 01:26 AM
|
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
|
I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
|
Quote:
Quote:
Quote:
The mixture screws are set Lean when new on the outboards. Thats why they have lead plugs in them. DO mess with them..
That's like saying don't remove the "Do Not Remove" tag from a new mattress
No kidding.... Notice I fixed the above quote..
Yep... Those outboard mix screws ARE NOT set in the proper place for a good performance tune up... Just like the factory distributors and recommended timing setting are junk for a clean idle and response.
There is a REALLY good write up on setting six packs in the tech section.
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: RobX4406]
#1321551
10/17/12 06:53 AM
10/17/12 06:53 AM
|
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
KillerBee
OP
master
|
OP
master
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
|
Thanks guys. I used these carbs on my other Challenger with good results. They are the newer Holley reproduction ones and never had lead plugs in them. I disassembled and cleaned the carbs before installing and made sure the screws turned freely in the cork. I installed the custom screws in the rear carb to be able to adjust it easier. I tried to adjust the carbs a little yesterday, unfortunately I had bad luck. I bought some clear sight plugs off E-bay(non Holley POS ones obviously) to help set the float levels, one lasted about 5 minutes before it fell apart,  I have a feeling part of it fell inside the fuel bowl so I'll be taking the carb back off to clean and inspect it. I also tore a jamb nut gasket on the needle and seat adjuster so I ordered a set of nylon ones. Nothing worse than working on a running car and at the end having to PUSH it back in the garage.  I hope to have better luck next time. 
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: KillerBee]
#1321552
10/17/12 05:58 PM
10/17/12 05:58 PM
|
Joined: Sep 2003
Posts: 3,426
weymouth,mass.
meepmeep70
master
|
master
Joined: Sep 2003
Posts: 3,426
weymouth,mass.
|
Quote:
Thanks guys.
I used these carbs on my other Challenger with good results.
They are the newer Holley reproduction ones and never had lead plugs in them.
I disassembled and cleaned the carbs before installing and made sure the screws turned freely in the cork.
I installed the custom screws in the rear carb to be able to adjust it easier.
I tried to adjust the carbs a little yesterday, unfortunately I had bad luck.
I bought some clear sight plugs off E-bay(non Holley POS ones obviously) to help set the float levels, one lasted about 5 minutes before it fell apart,
I have a feeling part of it fell inside the fuel bowl so I'll be taking the carb back off to clean and inspect it.
I also tore a jamb nut gasket on the needle and seat adjuster so I ordered a set of nylon ones.
Nothing worse than working on a running car and at the end having to PUSH it back in the garage.
I hope to have better luck next time.
killer,you will be happier buying moroso sight plugs,they hold up better then the holley ones,another trick i learned is to use maquires plastic polish on the plugs before installing,you will be able to see the fuel level SO much easier,no bouning the car,i also bought the special adjustment screws+ tool just haven't installed yet,i will after the season. do you like them? Darren
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: meepmeep70]
#1321553
10/17/12 07:47 PM
10/17/12 07:47 PM
|
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
KillerBee
OP
master
|
OP
master
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
|
killer,you will be happier buying moroso sight plugs,they hold up better then the holley ones,another trick i learned is to use maquires plastic polish on the plugs before installing,you will be able to see the fuel level SO much easier,no bouning the car,i also bought the special adjustment screws+ tool just haven't installed yet,i will after the season. do you like them? Darren
Not sure if I'm gonna try any more clear sight plugs....might just stick with the stock brass screws and a rag.
Didn't have time to tinker with the car tonight...chasing leaves.
The custom adjustment screws for the rear carb fit good, access on the passenger side was easy, the drivers side was a little difficult to see and reach, but after a little trial and error I got it figured out...I think they'll work out fine.
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: KillerBee]
#1321554
10/17/12 08:00 PM
10/17/12 08:00 PM
|
Joined: Sep 2003
Posts: 3,426
weymouth,mass.
meepmeep70
master
|
master
Joined: Sep 2003
Posts: 3,426
weymouth,mass.
|
Quote:
killer,you will be happier buying moroso sight plugs,they hold up better then the holley ones,another trick i learned is to use maquires plastic polish on the plugs before installing,you will be able to see the fuel level SO much easier,no bouning the car,i also bought the special adjustment screws+ tool just haven't installed yet,i will after the season. do you like them? Darren
Not sure if I'm gonna try any more clear sight plugs....might just stick with the stock brass screws and a rag.
Didn't have time to tinker with the car tonight...chasing leaves.
The custom adjustment screws for the rear carb fit good, access on the passenger side was easy, the drivers side was a little difficult to see and reach, but after a little trial and error I got it figured out...I think they'll work out fine.
THE MOROSO PLUGS DON'T FALL APART,BUT YOU ONLY USE THEM TO SET YOUR FLOAT HEIGHT,THEN PUT BRASS PLUGS BACK IN. i also used holleys first,and had to take apart 2 brand new carbs to get the junk out
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: 340SHORTY]
#1321556
10/18/12 10:15 AM
10/18/12 10:15 AM
|
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
|
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
|
Quote:
The mixture screws are set when new on the outboards. Thats why they have lead plugs in them. DONT mess with them..
never monkied with my outboards. The best way to adjust your idle mixture screws is by adjusting the primary carb, do it just like a 4bbl. Grab a vacuum gauge and set for best signal. Make sure the engine is warm and you have your timing set. Then turn the screws in and back out 1.25 turns...start the car and get tuning.
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: Mr.Yuck]
#1321557
10/18/12 02:18 PM
10/18/12 02:18 PM
|
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
KillerBee
OP
master
|
OP
master
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
|
Quote:
Quote:
The mixture screws are set when new on the outboards. Thats why they have lead plugs in them. DONT mess with them..
never monkied with my outboards. The best way to adjust your idle mixture screws is by adjusting the primary carb, do it just like a 4bbl. Grab a vacuum gauge and set for best signal. Make sure the engine is warm and you have your timing set. Then turn the screws in and back out 1.25 turns...start the car and get tuning.
Since mine came with no lead plugs installed it's worth a shot to adjust them.
Does anyone know how many turns out they came from the factory with?
I've heard everything from 5/8's to 3/4.
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: KillerBee]
#1321558
10/18/12 02:29 PM
10/18/12 02:29 PM
|
Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
master
|
master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
|
Quote:
Quote:
Quote:
The mixture screws are set when new on the outboards. Thats why they have lead plugs in them. DONT mess with them..
never monkied with my outboards. The best way to adjust your idle mixture screws is by adjusting the primary carb, do it just like a 4bbl. Grab a vacuum gauge and set for best signal. Make sure the engine is warm and you have your timing set. Then turn the screws in and back out 1.25 turns...start the car and get tuning.
Since mine came with no lead plugs installed it's worth a shot to adjust them.
Does anyone know how many turns out they came from the factory with?
I've heard everything from 5/8's to 3/4.
Most originals that I have done were only out about 1/4 turn at most and were a bit lean.
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: 62maxwgn]
#1321559
10/18/12 03:06 PM
10/18/12 03:06 PM
|
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
KillerBee
OP
master
|
OP
master
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
|
Quote:
Does anyone know how many turns out they came from the factory with?
I've heard everything from 5/8's to 3/4.
Most originals that I have done were only out about 1/4 turn at most and were a bit lean.
Thanks.
Are there any alternatives to the problematic cork seals around the mixture screws?
Is it OK to lube them with something (like vasoline)?
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: KillerBee]
#1321560
10/18/12 04:00 PM
10/18/12 04:00 PM
|
Joined: Aug 2003
Posts: 43,375
Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,375
Bend,OR USA
|
My original 1970 and 71 carbs like 1/2 turn out from lightly bottomed, the reproduction -1 carbs like a little less, like 1/4 to 3/8 turn out from lightly bottomed out  After getting the idle mixture set on the outboard I would adjust the center carb. for idle speed and idle quality, those six carbs (2.5 power valve  )would idle at 700 to 850 RPM in gear with a 260 @ .050 solid roller cam, makes the local street racers go crazy with envy  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: 440 Six Pack, question on adjusting idle mixture screws
[Re: KillerBee]
#1321561
10/18/12 05:26 PM
10/18/12 05:26 PM
|
Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
master
|
master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
|
Quote:
Quote:
Does anyone know how many turns out they came from the factory with?
I've heard everything from 5/8's to 3/4.
Most originals that I have done were only out about 1/4 turn at most and were a bit lean.
Thanks.
Are there any alternatives to the problematic cork seals around the mixture screws?
Is it OK to lube them with something (like vasoline)?
I do that with all of them.Also it's easier to put the seal on the screw the depth of the seal then push the needle and seal in together,elimlnates the chance of going in crooked or getting a piece of the seal in the needle orfice.
|
|
|
|
|
