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505" six pack engine WOT "bog"
#998453
05/23/11 03:57 PM
05/23/11 03:57 PM
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Joined: Sep 2006
Posts: 1,155
Home of the Bluegrass
MoparJunkie
OP
super stock
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OP
super stock
Joined: Sep 2006
Posts: 1,155
Home of the Bluegrass
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Hey guys I have as stated a 505" 440 source strker kit with an Engle solid cam 587/602" lift eddy heads... Car runs good except on a WOT stomp I get a slight "bog" then it comes into power. I noticed I have 9" of vacuum at idle and my power valve is a 35. And my jets are 64's. The throttle plate is not past the transition slot and they have been drilled for more air... My question is should my PV be around a 55-65? And would that cause my "bog"?
"It takes a Mopar to catch a Mopar”
1970 Challenger T/A 4 speed EV2
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Re: 505" six pack engine WOT "bog"
[Re: MoparJunkie]
#998454
05/23/11 04:00 PM
05/23/11 04:00 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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it would help. a 50cc pump will help also
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: 505" six pack engine WOT "bog"
[Re: sixpackgut]
#998455
05/23/11 04:07 PM
05/23/11 04:07 PM
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Joined: Sep 2006
Posts: 1,155
Home of the Bluegrass
MoparJunkie
OP
super stock
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OP
super stock
Joined: Sep 2006
Posts: 1,155
Home of the Bluegrass
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Are those 50cc pump readily available.. And I'm assuming you're talking accelerator pump???? Correct? Also is there a number on my pump to tell me what I have?
Last edited by gg70rr6pack; 05/23/11 04:07 PM.
"It takes a Mopar to catch a Mopar”
1970 Challenger T/A 4 speed EV2
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Re: 505" six pack engine WOT "bog"
[Re: MoparJunkie]
#998456
05/23/11 04:21 PM
05/23/11 04:21 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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http://www.jegs.com/p/Holley/Holley-Hi-Performance-50cc-Accelerator-Pump-Kit/743667/10002/-1If you are getting a bog just driving the car, it will fall flat on its face if you take it to the track and actually hook. you will need a 35 squirter if you change pumps. if you can find a blue pump cam, it will help your current situation
Last edited by sixpackgut; 05/23/11 04:24 PM.
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: 505" six pack engine WOT "bog"
[Re: MoparJunkie]
#998459
05/23/11 04:34 PM
05/23/11 04:34 PM
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Joined: Mar 2007
Posts: 3,301
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,301
West Coast, USA
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How do you have your timing set-up; what's your initial, how much mechanical advance, what's your total and are you running vacuum advance?
Do you have any vacuum leaks anywhere? How have you verified it?
There are some excellent vacuum outboard sixpack carb set-up instructions on this site. Have you followed them carefully?
Perhaps someone can post the link to them.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: 505" six pack engine WOT "bog"
[Re: jbc426]
#998460
05/23/11 05:08 PM
05/23/11 05:08 PM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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We have built several sixpac strokers and had the same problem. We found that the end carbs come in too fast and since they do not have acc pumps hence the bogg. We have had to sometimes double the springs in the diaphrams to cure that. It has never been the acc pump.
JAKES AUTOMOTIVE
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Re: 505" six pack engine WOT "bog"
[Re: sixpackgut]
#998462
05/23/11 07:18 PM
05/23/11 07:18 PM
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Joined: Sep 2006
Posts: 1,155
Home of the Bluegrass
MoparJunkie
OP
super stock
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OP
super stock
Joined: Sep 2006
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Home of the Bluegrass
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Where can I get a blue pump cam? I take it that the blue has a more aggressive pitch to add more fuel?
"It takes a Mopar to catch a Mopar”
1970 Challenger T/A 4 speed EV2
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Re: 505" six pack engine WOT "bog"
[Re: MoparJunkie]
#998463
05/23/11 07:35 PM
05/23/11 07:35 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Where can I get a blue pump cam? I take it that the blue has a more aggressive pitch to add more fuel?
yes. thats correct. you can buy pump cam kits but you get a bunch. you maybe able to buy singles from ebay
http://shop.ebay.com/i.html?_kw=blue&_kw=holley&_kw=pump&_kw=cam
Last edited by sixpackgut; 05/23/11 07:37 PM.
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: 505" six pack engine WOT "bog"
[Re: JAKE68]
#998464
05/23/11 08:08 PM
05/23/11 08:08 PM
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Joined: Oct 2004
Posts: 1,946
Connecticut
5126brl No more
top fuel
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top fuel
Joined: Oct 2004
Posts: 1,946
Connecticut
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Quote:
We have built several sixpac strokers and had the same problem. We found that the end carbs come in too fast and since they do not have acc pumps hence the bogg. We have had to sometimes double the springs in the diaphrams to cure that. It has never been the acc pump.
Jake as someone with a 600 hp 451 with a Sixpac I would like to hear some more about your spring setups on these.
Mine will still come in hard with the brown springs, running about 13" vacum at 1100rpm. installed quick fuel plates and 88 jets.
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Re: 505" six pack engine WOT "bog"
[Re: JAKE68]
#998465
05/23/11 08:17 PM
05/23/11 08:17 PM
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Joined: Sep 2006
Posts: 1,155
Home of the Bluegrass
MoparJunkie
OP
super stock
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OP
super stock
Joined: Sep 2006
Posts: 1,155
Home of the Bluegrass
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Do I just use two springs on the diaphragm then???
"It takes a Mopar to catch a Mopar”
1970 Challenger T/A 4 speed EV2
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Re: 505" six pack engine WOT "bog"
[Re: MoparJunkie]
#998466
05/23/11 10:59 PM
05/23/11 10:59 PM
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Joined: Aug 2003
Posts: 43,911
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,911
Bend,OR USA
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I agree with Jake, try slowing down the outbaord carbs opening rate first  BTW what jetting and timing are you using now? Stock carbs or the newer Holley replacement carbs? I used the old(1984 maybe) Mopar bible suggestions on one of my sixpak carbs set up and used a wide ban on another set, 12.8 to 13.3 at WOT worked the best on both using 93 octane non Ethanol Oregon pump gas  What type trans, automatic or stick? If automatic what stall converter? Enough questions from me now 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 505" six pack engine WOT "bog"
[Re: Cab_Burge]
#998467
05/23/11 11:37 PM
05/23/11 11:37 PM
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Joined: Dec 2007
Posts: 10
Saskatoon, Canada
sk68gtx
member
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member
Joined: Dec 2007
Posts: 10
Saskatoon, Canada
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I haven't checked lately, but you used to be able to buy spring kits with varying strengths for the end carbs. We used them for tuning along with jets / plates, squirters and timing based upon air and track conditions.
68 GTX 440-6
10.92 @ 120
03 CTD Laramie QC 4x4
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Re: 505" six pack engine WOT "bog"
[Re: gch]
#998471
05/24/11 08:28 AM
05/24/11 08:28 AM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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Quote:
Try putting on some end carbs with accelerator pumps.Might wake it up for ya.
That will cover up the problem that the end carbs are opening too fast. They do make a spring kit, but occasionlly I still can't get them to slow down enough with even the heaviest springs that is why I would have to double the light springs to to tune it in. I never tried the idea with a hole in the vacuum line but I like that I may have to try it. It use to work when I was playing with the vacuum line on a turbo car I had.
Last edited by JAKE68; 05/24/11 08:31 AM.
JAKES AUTOMOTIVE
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It weighs 3450 with me in it at the track, it runs in the mid tens cork up on Oregon pump gas at 128+ MPH with the 6 pak air cleaner on 
1.43 60 ft. times on 315x60x15 M?T ET Street radials 
