six pack

[RaptorF229]

So my challenger has a six pack and the idle currently is set a high so as to not be using the idle circuits. I'm going to go through them but since this is my first six pack set what should a good idle baseline be. Also can you guys give me some setup positions you have?

[Chryco Psycho]

will it not idle on the idle circuits ?
 if not you need to drill holes in the throttle plates to allow more air in while keeping the throttle plates closed to allow the idle transfer slots to work , also there is idle screw in the front of the base plates of the outboard carbs , adjusting them may help also ,, you will need to get a vacuum reading idling in gear , the power valve may need to be lowered to a 2.5 or lower to stay closed at idle also

[RaptorF229]

I haven't really checked to see if it doesn't idle. I am waiting for the new ignition kit  and wires that I'm going to put in before I start on the carb. I'm just doing my homework on the six pack. I don't really want to do any drilling. Will tv promaxsetup help out?

[500Stroker]

I drilled the throttle plates and installed the promaxx metering plate.  Idles great and as low as 700 in gear.  Air fuel reading is 14.7 in park.

[moper]

What engine, what camshaft?

[AMXguy]

Is your problem like mine? I have to keep the idle on my six pack at 900 or better or my vacuum drops low enough my vac  advance drops out and kills the engine. if I advance my timing a tiny bit more  it idles great but knocks on acceleration, I've tried everything except drilling the holes and I end up the same place. since I have a 4 speed I can live with it but I wish I could idle down a little and keep it running, I do have a pretty healthy cam so I'm sure that's part of my trouble.

[Chryco Psycho]

I set a six pack up last year with the Mechanical Mopar 590 cam , I know from experience it is only good for approx 3-4" of vacuum , I drilled holes in the plates , changed the power valve & blocked the idle air bleeds & it idles perfectly at 700 RPM . I didn`t even expect it run as good as it does

[71chally416]

A friend of mine used to have a 440 6 pak Dart that had a radical street cam and it idled real nice and responded great, but I couldn't begin to tell you how he did it. It can be done. 

[AMXguy]

Blocked the air bleeds?  I already changed the power valve.  what size holes are you drilling and how many? just on the center carb right?

 Is there any way to lighten the spring on the vac advance? I have a Mopar performamce distributor with the adjustable vac advance but I think all that does is limit the travel, I'm just about 1" of vac short of holding it in at idle.

[RaptorF229]

Ok so even with the promax kit you need to drill the throttle plates? I haven't checked to see how this respond on lower idle. Like I said I'm waiting to install a custom ignition setup from FBO. Ill get the ignition done first then the carb.

[Chryco Psycho]

I drilled a 1/16 "-3/32" hole in all the throttle plates all 6 plates in all the carbs ,
you can install lighter springs in the dist , you need to pry the reluctor off the top & remove the advance plate to get at them .
 the Promax plates do not adjust the air bleed size or the air bypass past the throttle plates so I see no reason why the promax plates would allow anything but jet changes on the outboard carbs & possible better emulsion

[moper]

AMX, the vacuum advance should not have a signal at idle... So nothing you do to adjust it will have any affect if the carb is on the idle circuit. I've run a cam with 4" of vacuum and not needed any holes or air bleed work. It's rare to not be able to get a 6bbl to idle well unless something is wrong somewhere.

[AMXguy]

My distributor is set up by FBO to run manifold vacuum, this solved all my problems I'd been fighting except the fact I have to idle a little faster than I'd like to hold vacuum. if I had a little more vac it would run perfect.

 I'm going to check out the vac advance spring deal first I think before I try anything else. Raptor if you're getting a FBO set up and if you don't have enough vacuum you may find the same issue I have. he always sets things up for manifold vacuum, you'll like it.

[moper]

Ah. That makes a little more sense. Not something I do, but if that's what he believes and it works for you, thats all that matters.

[RaptorF229]

AMX how are you getting manifold vac? Is it from the lower port tied in with the two outboard carb?