Re: 6 Pack Carb Idles well with Air Fuel Idle Screws Closed
[Re: 3XBlack6packGTX]
#2083244
05/31/16 02:42 AM
05/31/16 02:42 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Black there are no dump Q's. yes too high of pump psi wont bother the PV but it will overpower the needle/seat assys & cause a rich idle. eddys dont like more than ~5.5 lbs. Holley can handle higher
live every 24 hour block of time like it's your last day on earth
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Re: 6 Pack Carb Idles well with Air Fuel Idle Screws Closed
[Re: 3XBlack6packGTX]
#2083663
05/31/16 10:26 PM
05/31/16 10:26 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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More initial MAY help. my stock '83 318 had 18. post how things turn out
live every 24 hour block of time like it's your last day on earth
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Re: 6 Pack Carb Idles well with Air Fuel Idle Screws Closed
[Re: Sxrxrnr]
#2084126
06/01/16 03:56 PM
06/01/16 03:56 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
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Where are idle mixture screws on end carbs set to. They could be supplying too much fuel at idle causing center carb setting to be irrelevant. They should only be barely screwed out from full in. Mopar carbs of course had them leaded up so as not to be messed with unless you really knew what you were doing.
Could be several competing issues, not only just 1. Choke completely open? OP, what list number carbs are you using? Also are the lead plugs in the base plates on the outboard carbs. in place or removed? If removed reset the idle mixture screws to 1/3 to 1/2 turn out from bottom. Adjust them in sofly, DO NOT OVER TIGHTEN THEM IN If there not removed remove them now and adjust them in and see how that helps I've owned and ran a bunch of different OEM sixpaks on both BB and SB Mopar, they will idle on the outboard carbs only Welcome to the woderful world of Six Paks AKA, you will need to get the outboards carbs idle mixture set up adjusted properly before using the center carb. for the final tuning and idle speeds Make sure and remove and reset the carb. linkage on the drivers side to insure the outboards are closed all the way at idle with the the choke opened all the way, block it open if you need to The key to success on these working good is in ALL the details
Last edited by Cab_Burge; 06/01/16 03:57 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 6 Pack Carb Idles well with Air Fuel Idle Screws Closed
[Re: Cab_Burge]
#2391192
10/22/17 12:53 PM
10/22/17 12:53 PM
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Joined: May 2016
Posts: 14 Illinois
3XBlack6packGTX
OP
member
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OP
member
Joined: May 2016
Posts: 14
Illinois
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Gentlemen
It's been a while since I posted but I just wanted to follow up on this situation. I haven't driven the car much since the first posting and subsequent replies but wanted to let all know where I am today on this. First, thanks for the help.
The car idle like a pig with low vacuum, somewhere around 10-12 hg. The engine bounces around like it wants to jump out of the car until it warms up. Still a really bad fuel Smell.
So i grew a pair and took the carbs off to check settings and power valve and jets etc. I went through the the guidance by Tom quad from the a12 lift Off Registry website.
When the carbs were redone before Putting them on the motor, the carb guy said they were setup and ready to go. Well, he doesn't know what he is doing!
Outboard carbs were each set 3 turns out so I backed them down to 1/8 CCw. The center carb had #68 jets so I put in #64 just so I could baseline. I checked the power valve and it Seemed there was fuel in the space behind it so that made me think it may be bad. I replaced it with a 4.5 which is lower than 6.5 but remember my vacuum hg was low so I wanted to be sure. I can always go back and put a higher Pv in. I did Not check of verify float levels yet. Also my fuel pump is the Carter street fuel pump Which the a12 site recommends.
Well, results? After snugging everything up nice and firm and starting the engine......I had a dramatic improvement, which I was hoping for.
The engine woke up and started right away with a very smooth idle and a steady vacuum of about 20 hg. Also I forgot to mention I set the center carb idle mixture to 1.5 ccw. The idle rpm was 1500 but i expect it to be higher which I can adjust that down with a further Timing and vacuum tuning.
I couldn't check the fuel float levels since the idle was so poor so that's my next job and then I will further tune to get max vacuum at an idle of around 900-1100 Rpm in gear.
Voila, I know have control over the idle circuit on the center.carb. and no more fuel smell. I will also be replacing the spark plugs and the engine oill before I Try to further tune For timing, vacuum and idle. I'm sure the plugs are Fouled beyond belief.
The lesson of this story......pull the carbs and verify everything to the 6 pack carb checklist and don't take anything that your carb rebuilder tells you as accurate. The only way to figure these things Out Is To Understand them and learn from these threads where people that have these carbs can share info.
I do believe the power valve was faulty but I will check it it on a mighty Vac gauge.
The moral of this story..... a rich condition at idle and no control over main carb idle Circuit, check out board carbs to ensure 1/8 ccw and check that pv is working, 6.5 is appropriate for most engines with Hg of 12 or greater. Also, make sure everything is Nice and snug but don't gorilla tighten. I turn everything till it stops under normal exertion. If I have to grit my teeth or out my body weight on it, then I'm Over tightening.
If overich condition persists after correct carb set up then verify fuel pressure is Not Too much and float levels are adjusted correctly. For my situation, an accurate carb setup remedied my rich condition so I'm assuming my fuel pressure is fine and floats just need verification. I do have a slight bog under firm acceleration but I believe that's my 4.5 pv and I will be going back to a new 6.5 pv once I have everything dialed in for good.
By the way. As i was removing the carbs I noticed some less than tight fasteners so I imagine i had some Vacuum leaks too
Now, I have an entirely different car that doesn't disperse crowds like a tear gas canister. It idles well and I have control over the idle circuit..
Thanks All.
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Re: 6 Pack Carb Idles well with Air Fuel Idle Screws Closed
[Re: 3XBlack6packGTX]
#2391195
10/22/17 12:58 PM
10/22/17 12:58 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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A happy ending! its too bad that shoddy work by some gives the rest of us a bad rep.
live every 24 hour block of time like it's your last day on earth
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Re: 6 Pack Carb Idles well with Air Fuel Idle Screws Closed
[Re: 3XBlack6packGTX]
#2391435
10/22/17 08:55 PM
10/22/17 08:55 PM
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Joined: Jan 2003
Posts: 12,814 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,814
Benton, IL.
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Where in this wonderful state of Illinois are you?
Master, again and still
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