Re: SIX PACK WON'T IDLE
[Re: superwrench]
#116708
09/13/08 07:36 AM
09/13/08 07:36 AM
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Anonymous
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Anonymous
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IT HAS THE MOPAR 484 LIFT CAM IN IT WITH 10 LBS VACUMN WITH 3.5 POWER VALVE. I DON'T KNOW AFTER THESE RESPONSES IF I SHOULD GO AFTER TIMING ADVANCE OR CARBS. I HAVE THE VACUMN OF OF THE DIST. NOW.THE CARBS SEEM PRETTY CLOSE
THANKS MOPARTS
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Re: SIX PACK WON'T IDLE
[Re: sogtx]
#116712
09/13/08 10:07 PM
09/13/08 10:07 PM
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Anonymous
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that cam has very little vacuum at idle. i ran the 3.5 pv with that cam in a sb
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Re: SIX PACK WON'T IDLE
#116713
09/14/08 07:09 AM
09/14/08 07:09 AM
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Anonymous
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SO YOU THINK A 5.0 POWER VALVE WOULD HELP INSTEAD OF THE 3.5 I HAVE IN NOW SINCE I HAVE 10 LBS VACUMN
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Re: SIX PACK WON'T IDLE
[Re: 70sixpkrt]
#116717
09/14/08 11:43 PM
09/14/08 11:43 PM
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Joined: Nov 2005
Posts: 836 lancaster, new york
macmic87
super stock
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super stock
Joined: Nov 2005
Posts: 836
lancaster, new york
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you'll adjust these screws just like the center carb, except you can't just use a vacumm/ tach gauge,....look into the top of the front end carb, you see 2 small projections in each bore on each side, just below the neck, these are the air bleeds, block off the outer bleed using your finger over the small tiny hole, with the motor running at idle (low), it should stumble or pick up in idle, when you block off, either outboard bleed, set the front carb first, pick a bore, left or right, with it's coresponding baseplate idle screw, block the bleed off with your finger,(make sure the carbs throttle plate is fully closed) do one side at a time, when you block the bleed, if the idle increases, too much fuel, remove your finger, turn the base screw on the side your blocking the bleed on, in, one turn, block the bleed again, listen for the idle, (you could use a tach gauge at this point), if it stumbles/ decreases, no fuel, back the base screw off a half turn, block the air bleed again see where the "idle" is,......keep adjusting in this fashion until there's no change in idle, no increase/ decrease, you now have the ideal fuel/ air ratio for the vacummm requirement on your motor this really does work
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Re: SIX PACK WON'T IDLE
[Re: RATTRAP]
#116721
09/15/08 08:56 PM
09/15/08 08:56 PM
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Joined: Nov 2004
Posts: 1,760 Port Alberni, British Columbia
MoparDonny
top fuel
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top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
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Quote:
I thought 1 1/2 turns was the factory setting. What are your results on 2 1/2 turns out?
1-1/2 turns probably is the factory setting but a larger cam with poor vacuum is NOT a factory setting. I just know by my experience with Holleys and SIX PAK's that with a cam such as a MP280 to a MP509 or anything bigger likely won't run worth beans with 1.5 to 2.5 turns. I could go check my Holley right now and I bet it's at 3 turns or so. I 'll check what we have my Dad's SIX PAK set at too, that may take a day or so though. I cured most of my buddy's driving and starting issues on his 460 ford by giving it a little timing and an extra turn out on the idle mix screws.
Don.
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Re: SIX PACK WON'T IDLE
[Re: MoparDonny]
#116725
10/01/08 09:14 AM
10/01/08 09:14 AM
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Joined: Jan 2007
Posts: 531 Charlotte, NC
Kowal
mopar
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mopar
Joined: Jan 2007
Posts: 531
Charlotte, NC
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This has been a great string of info.
Let me see if I can really get everyone upset by seeing if I can summarize what I have learned, heard, etc. from this and the other posts.
For a stock 440 or one with a moderate cam:
16 to 18 initial timing, 36 to 38 full advance. The new Mopar electronic dist. can be modified for total advance using the Mallory (MAA-29014) plastic gauge kit.
Distributor springs should kick in about 100 rpm higher than what the car is idling at and advance fully in place no later than 2500 rpm. (per the Mallory instructions on the idle setting)
Power Valve shoud be set at 1/2 the vacuum reading you get on the center carb, with the car in neutral.
Outboard carbs, for an automatic, should have their idle mixture screws opened over one turn, maybe one and a quarter to one and a half (per Larry Shepard's tuning book on the outside number). Sticks seem to work at 3/4 to one turn. Use the finger trick on the outboard carbs once close to set. (By the way, I can adjust my rear outboard carb on the car by using a very long, thin, screwdriver that I got at Ace and by my having replaced the mixture screws with new Holley screws, which stick out further on the baseplate. I go at each at an angle and can just get each one)
Center carb idle mixture is adjusted using a vacuum gauge, going for highest vacuum, with the car in gear. Vacuum seems to vary wildly by car but 10 to 14 seems to be the range. 10 being low and should be investigated for leaks and other set up issues unless the cam is large.
Carb jets on the center carb should probably be at 64 or maybe higher. The 62 that is stock is too lean.
Vacuum advance usage on the dist. is trial and error as you drive.
OK...what did I miss or get wrong?
'69 Hemi Charger 500, ‘70 U code Challenger R/T (These and a bunch others at www.dkowal426.com) P.J. O'Rouke: "The old car ran perfectly, right up until it didn't."
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Re: SIX PACK WON'T IDLE
[Re: Kowal]
#116726
10/01/08 09:29 AM
10/01/08 09:29 AM
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Joined: May 2005
Posts: 907 Mississauga, Canada
KARLN
super stock
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super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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sorry to highjack but is 16-18 degrees timing also recommended for a SB with a 6 pack?
B5 Challenger T/A
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Re: SIX PACK WON'T IDLE
[Re: KARLN]
#116727
10/01/08 05:23 PM
10/01/08 05:23 PM
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Anonymous
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If you go back and find some of 62MAXWGN's post on 6pks you will probably find your answers.He has probably forgotten more than most of us know about how to make them work and fix existing problems.
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