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SURGING Six Pack carbs #310136 05/06/09 05:15 PM 05/06/09 05:15 PM
Joined: Jan 2003 Posts: 11,854 Georgetown Ontario Canada anlauto OP I Live Here
anlauto OP I Live Here Joined: Jan 2003 Posts: 11,854 Georgetown Ontario Canada	I've got a set of new six pack carbs from Mopar Performance. While driving under normal circumstances they constantly surge and surge.... I've checked for vacuum leaks and set the outboards to make sure they're shut completly, but now I'm at a loss... Any ideas? Suggestions? *CHECK OUT MY NEW WEB SITE !*

Re: SURGING Six Pack carbs [Re: anlauto] #310137 05/06/09 05:25 PM 05/06/09 05:25 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	there have been some comprehensive threads on 6 pack tuning. You might see if it can be retrieved. bump up your center carb jets 4 sizes & try it. live every 24 hour block of time like it's your last day on earth

Re: SURGING Six Pack carbs [Re: anlauto] #310138 05/06/09 05:43 PM 05/06/09 05:43 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Usally means lean.

Re: SURGING Six Pack carbs [Re: Challenger 1] #310139 05/06/09 06:33 PM 05/06/09 06:33 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Quote: Usally means lean. yup. 1st thing I did w. my new set-up was drop some 64's in. Haven't driven it yet. trying to get the brakes set-up.

Re: SURGING Six Pack carbs [Re: Mr.Yuck] #310140 05/06/09 08:12 PM 05/06/09 08:12 PM
Joined: Feb 2004 Posts: 3,076 Renton, Wa. C Classof70Chally super gas
Classof70Chally super gas C Joined: Feb 2004 Posts: 3,076 Renton, Wa.	I just went up from 66's to 68's on my center carb with my new combo. It wasn't surging but felt a bit weak when I mashed the gas. It definately likes the 68's!

Re: SURGING Six Pack carbs [Re: anlauto] #310141 05/25/14 11:56 PM 05/25/14 11:56 PM
Joined: Jul 2007 Posts: 11,836 Florida M mopar346 Let me tell ya about fat chicks!
mopar346 Let me tell ya about fat chicks! M Joined: Jul 2007 Posts: 11,836 Florida	Quote: I've got a set of new six pack carbs from Mopar Performance. While driving under normal circumstances they constantly surge and surge.... I've checked for vacuum leaks and set the outboards to make sure they're shut completly, but now I'm at a loss... Any ideas? Suggestions? What did you end up finding? My AAR is surging at highway speeds (2500-3000ish RPMS) and I figured lean. I am fixin to drive it 3000 miles so I don't want lean that's for sure. I did some diggin and came up with this thread. I am just starting to think about it so I haven't really checked anything. I don't believe there are any vacuum leaks and I am not sure of the jet size. Initial timing is at 10*, not sure of total timing, haven't checked. I am running a new single point distributor with an Accel undercap conversion and an Accel Super Coil. I went through the carbs myself (built plenty over the years) and they seem to work great, since it was an operating set up (although I never drove it) I went back with the jets that were in it. This is the only performance issue I have noticed in 800 miles of driving since waking it up. Stock T/A 340 except for a P4452992 camshaft, .474 lift 280 duration and a 4144 center carb. Thanks in advance for any input, Kevin Careful, your character's showing!

Re: SURGING Six Pack carbs [Re: mopar346] #310142 05/26/14 12:15 AM 05/26/14 12:15 AM
Joined: Nov 2005 Posts: 3,456 Fly Over States P PHJ426 master
PHJ426 master P Joined: Nov 2005 Posts: 3,456 Fly Over States	Check out Tom Quad on this thread follow his advice you cannot go wrong..... https://board.moparts.org/ubbthreads/show...rue#Post6475031

Re: SURGING Six Pack carbs [Re: PHJ426] #310143 05/26/14 01:04 AM 05/26/14 01:04 AM
Joined: Jul 2007 Posts: 11,836 Florida M mopar346 Let me tell ya about fat chicks!
mopar346 Let me tell ya about fat chicks! M Joined: Jul 2007 Posts: 11,836 Florida	Thank you, I have an earlier version from him but it is always a good read. It does not however mention anything about surging and even though it would not hurt them or me to go back to square one and tune them by his standards they seem to run great, I have had an occasional hot start issue but minor and it will occasionally try to load up at idle. So while I am typing I am talking myself into going through the set up process from Tom. Thanks for adding to my work load I have to leave in 12 days! Careful, your character's showing!

Re: SURGING Six Pack carbs [Re: anlauto] #310144 05/26/14 01:38 AM 05/26/14 01:38 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: While driving under normal circumstances they constantly surge and surge. but now I'm at a loss...Any ideas? Suggestions? k.i.s.s. bump up the main jets 4 sizes & see what develops. Easy to do easily reverseable. Holler how it turns out live every 24 hour block of time like it's your last day on earth

Re: SURGING Six Pack carbs [Re: mopar346] #310145 05/26/14 04:07 AM 05/26/14 04:07 AM
Joined: Aug 2003 Posts: 43,097 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,097 Bend,OR USA	I did a set of OEM 340 AAR Cuda carbs years ago, it was very sensitive to the center carb. jets, one size up or own made it not drive well I didn't look up the carb. # you posted, if it is a original, not a replacement carb with a -1 or -2 to the right of the list number then try looking on Holley web site for the original jetting and start with that, don't forget to use the proper power vave, especially with that dang Mopar 284 camshaft Good luck, I agree with the others on the surging, one step, one Holley # richer jet, not 4 should eliminate the surging Let us know what you do and the results please. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: SURGING Six Pack carbs [Re: Cab_Burge] #310146 05/26/14 08:04 AM 05/26/14 08:04 AM
Joined: Aug 2003 Posts: 2,465 Answering the call of the wild T ThermoQuad top fuel
ThermoQuad top fuel T Joined: Aug 2003 Posts: 2,465 Answering the call of the wild	the guide says nothing about surging because if you follow it there should be no surging... Surging usually = lean baseline set up incorrect jetting center & outboard mixture screws thermostat 195 dist phasing timing follow the guide - I would post it but it's on the other computer

Re: SURGING Six Pack carbs [Re: ThermoQuad] #310147 05/26/14 10:50 AM 05/26/14 10:50 AM
Joined: Jul 2007 Posts: 11,836 Florida M mopar346 Let me tell ya about fat chicks!
mopar346 Let me tell ya about fat chicks! M Joined: Jul 2007 Posts: 11,836 Florida	Thanks folks, I will make some changes over the next few days and post my results. Tom, I have them saved to my computer and the above link takes you to it but thank you for your input. Careful, your character's showing!

Re: SURGING Six Pack carbs [Re: ThermoQuad] #310148 05/26/14 11:08 AM 05/26/14 11:08 AM
Joined: Apr 2010 Posts: 4,154 bethlehem pa M mikemee1331 master
mikemee1331 master M Joined: Apr 2010 Posts: 4,154 bethlehem pa	Quote: thermostat 195 this right here is probably the single most overlooked and ignored step in the whole guide but it does make a difference....

Re: SURGING Six Pack carbs [Re: mikemee1331] #310149 05/26/14 12:58 PM 05/26/14 12:58 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Quote: Quote: thermostat 195 this right here is probably the single most overlooked and ignored step in the whole guide but it does make a difference.... what does it do.

Re: SURGING Six Pack carbs [Re: ademon] #310150 05/26/14 02:04 PM 05/26/14 02:04 PM
Joined: Aug 2003 Posts: 43,097 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,097 Bend,OR USA	Quote: Quote: Quote: thermostat 195 this right here is probably the single most overlooked and ignored step in the whole guide but it does make a difference.... what does it do. It makes the motor run hotter I like to run the 160 thermostat and jet and tune accordling for best performance Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: SURGING Six Pack carbs [Re: Cab_Burge] #310151 05/26/14 02:28 PM 05/26/14 02:28 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: what does it do. It makes the motor run hotter I like to run the 160 thermostat and jet and tune accordling for best performance And I do not let thinking like that anywhere near my vehicles. Running a 160 degree thermostat is about the most backward thinking possible, along with 20w50 oil and blowing clouds of black smoke from a diesel. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: SURGING Six Pack carbs [Re: Supercuda] #310152 05/26/14 02:57 PM 05/26/14 02:57 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	That MP cam has 238 at .050 IIRC. IMO, No way it runs well at idle to get a baseline with only 10* initial timing. I'd roughly double that number to the 18-22 range and it will idle much better. Timing first! An anology I use, carbs are like building a house. You don't build the roof first then the walls then foundation, you start at the foundation and work up. Idle (timing/carb settings) is the foundation. If that's off, you have to make compromises in the systems after it to get the car to work right. Set foundation correctly and the other systems are much easier to tune.

Re: SURGING Six Pack carbs [Re: ademon] #310153 05/26/14 03:09 PM 05/26/14 03:09 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Quote: Quote: Quote: thermostat 195 this right here is probably the single most overlooked and ignored step in the whole guide but it does make a difference.... what does it do. The 340 6 pack intake has an issue with fuel puddling. Colder the intake, the worse the issue.

Re: SURGING Six Pack carbs [Re: ademon] #310154 05/26/14 03:13 PM 05/26/14 03:13 PM
Joined: Apr 2010 Posts: 4,154 bethlehem pa M mikemee1331 master
mikemee1331 master M Joined: Apr 2010 Posts: 4,154 bethlehem pa	Quote: Quote: Quote: thermostat 195 this right here is probably the single most overlooked and ignored step in the whole guide but it does make a difference.... what does it do. answered above! engine is hotter, fuel doesn't puddle

Re: SURGING Six Pack carbs [Re: anlauto] #310155 05/26/14 04:11 PM 05/26/14 04:11 PM
Joined: Jan 2003 Posts: 14,470 renton, Washington ph23vo I Live Here
ph23vo I Live Here Joined: Jan 2003 Posts: 14,470 renton, Washington	Quote: I've got a set of new six pack carbs from Mopar Performance. While driving under normal circumstances they constantly surge and surge.... I've checked for vacuum leaks and set the outboards to make sure they're shut completly, but now I'm at a loss... Any ideas? Suggestions? before DOING ANYTHING unplug the vacuum advance... [plug hose] and drive to see if it cures it..

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