Six pack idle mixture screw broken -fix?
#1859148
06/28/15 09:23 PM
06/28/15 09:23 PM
|
Joined: Mar 2010
Posts: 183 La Habra, CA
70440SIXPK
OP
member
|
OP
member
Joined: Mar 2010
Posts: 183
La Habra, CA
|
Hi guys, I just seen that someone down the line decided to mess with the outboard idle mixture screws and broke them. I managed to scrounge up a good base plate and fixed one till I seen that the rear carbs base plate had the same issue and unfortunately it has the same problem as the front...
I was wondering if anyone had any insight as to how to extract these mixture screws, or where I can send it for a quality fix...
Thanks!
1970 Challenger Factory V Code
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: 70440SIXPK]
#1859448
06/29/15 02:03 AM
06/29/15 02:03 AM
|
Joined: Apr 2004
Posts: 535 Marilla, New York
RalleyA12
mopar
|
mopar
Joined: Apr 2004
Posts: 535
Marilla, New York
|
See if you can find a machine shop with an EDM (Electrical discharge machining). Just had a broken tap removed from a Holley carb using an EDM, cost me $30.
Last edited by RalleyA12; 06/29/15 02:05 AM.
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: RalleyA12]
#1859459
06/29/15 02:33 AM
06/29/15 02:33 AM
|
Joined: Mar 2010
Posts: 183 La Habra, CA
70440SIXPK
OP
member
|
OP
member
Joined: Mar 2010
Posts: 183
La Habra, CA
|
Thanks for the tip! Hopefully I find someone near my area that can do it.. Most of the machine shops here in SoCal are premadonna's ... If it isn't a 10,000 dollar job they don't want to "tool up" to mess with it...
1970 Challenger Factory V Code
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: 70440SIXPK]
#1859537
06/29/15 11:04 AM
06/29/15 11:04 AM
|
Joined: Aug 2009
Posts: 1,318 Ohio
jlatessa
pro stock
|
pro stock
Joined: Aug 2009
Posts: 1,318
Ohio
|
I bought that kit and it works great, so easy to get at the rear screws.
The way we used to adjust the idle was to get as smooth an idle using the front carb adjusters, the switch carbs and do the same, works almost as good....
Joe
PS then put carbs back in original positions if you have staggered jetting, (recommended)
Last edited by jlatessa; 06/29/15 11:06 AM.
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: jlatessa]
#1859771
06/29/15 04:55 PM
06/29/15 04:55 PM
|
Joined: Mar 2010
Posts: 183 La Habra, CA
70440SIXPK
OP
member
|
OP
member
Joined: Mar 2010
Posts: 183
La Habra, CA
|
I seen that screw set on Ebay.... Although pricey, I can justify the expense for the ease of access....
Whoever at holley designed the base plates on these carbs should be, well i wont go there..... Putting brass idle mixture screws that bust with the slightest bit of pressure doesn't make sense to me, nor does the location..... oh well, I guess it could be worse, non adjustable like a Chevy!
1970 Challenger Factory V Code
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: 70440SIXPK]
#1859774
06/29/15 04:56 PM
06/29/15 04:56 PM
|
Joined: May 2005
Posts: 907 Mississauga, Canada
KARLN
super stock
|
super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
|
I agree, the screws and adjusting tool are a must for six packs. My TA idles fantastic once they were installed.
B5 Challenger T/A
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: KARLN]
#1859952
06/29/15 09:03 PM
06/29/15 09:03 PM
|
Joined: Mar 2010
Posts: 183 La Habra, CA
70440SIXPK
OP
member
|
OP
member
Joined: Mar 2010
Posts: 183
La Habra, CA
|
Its funny you say that.... I have never had any experience with six pack set ups prior to my challenger.. i didnt think that much of the idle circuit is actually ran off the outboards... Boy was I wrong... I was messing with the center carb all day trying to get the stumble out... as soon as I was able to play with the front carb, I noticed a night and day difference! I'm excited to tinker with it a bit more and get it where it needs to be....
1970 Challenger Factory V Code
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: 70440SIXPK]
#1859962
06/29/15 09:22 PM
06/29/15 09:22 PM
|
Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
|
master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
|
Its funny you say that.... I have never had any experience with six pack set ups prior to my challenger.. i didnt think that much of the idle circuit is actually ran off the outboards... Boy was I wrong... I was messing with the center carb all day trying to get the stumble out... as soon as I was able to play with the front carb, I noticed a night and day difference! I'm excited to tinker with it a bit more and get it where it needs to be.... Tinker like this,once you have no change in idle with or without air bleed covered you're where you are supposed to be. .
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: 62maxwgn]
#1859965
06/29/15 09:29 PM
06/29/15 09:29 PM
|
Joined: Mar 2010
Posts: 183 La Habra, CA
70440SIXPK
OP
member
|
OP
member
Joined: Mar 2010
Posts: 183
La Habra, CA
|
Thanks again Bill!.... Cant wait to try out these tricks once i get the broken screw worked out....
1970 Challenger Factory V Code
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: Sxrxrnr]
#1861097
07/01/15 09:42 AM
07/01/15 09:42 AM
|
Joined: Jun 2012
Posts: 1,386 Philadelphia PA
Pynzo
Drugs are bad
|
Drugs are bad
Joined: Jun 2012
Posts: 1,386
Philadelphia PA
|
Fuhgeddaboudit that seller will get more made up. He's got a little gold mine with that product. Maybe $2 worth of hardware and tool. Nice profit margin. Don't get me wrong, I'm glad I have it. I easily drop $60 buying beer every time I go to a ballgame with nothing to show for it but worn shoes from trips to the men's room. Glad to see the American Dream come to life! At least for one ingenious dude!
Last edited by Pynzo; 07/01/15 09:47 AM.
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: Sxrxrnr]
#1861099
07/01/15 09:46 AM
07/01/15 09:46 AM
|
Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
|
master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
|
Just ordered up. eBay listing said "last one". Perhaps eminent room marketing ploy, if so worked for me. Besides I did prefer not swapping out throttle plate(s) if not forced to. I believe now you must also change out throttle butterflies to new plate(s). Am I misremembering that at one time this was not required? There was a problem with some of the early plates sticking,they were stamped #199,plate stamped #226 corrected the problem,no need to change.
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: 70440SIXPK]
#1861257
07/01/15 02:05 PM
07/01/15 02:05 PM
|
Joined: Jul 2011
Posts: 960 Chicago
PurpleBeeper
super stock
|
super stock
Joined: Jul 2011
Posts: 960
Chicago
|
I put my baseplates in a vise (wrapped in a shop rag), put a propane torch to the screw thread area & just dug at the brass screw with a little screwdriver and a pocket knife to "cut" a slot into it and the screws turned out easy once heated. It's a crude method, but it worked for me. Then all you need is replacement idle screws from Holley.
FYI- I have the adjuster tool/hex head idle screws and I don't see it as that big of an advantage since you still need a Promax base plate to get to the back carburetor. The screws are much less likely to strip out again though.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: PurpleBeeper]
#1861314
07/01/15 03:30 PM
07/01/15 03:30 PM
|
Joined: Oct 2003
Posts: 2,366 Banana Republic
FM3AAR
top fuel
|
top fuel
Joined: Oct 2003
Posts: 2,366
Banana Republic
|
FYI- I have the adjuster tool/hex head idle screws and I don't see it as that big of an advantage since you still need a Promax base plate to get to the back carburetor. The screws are much less likely to strip out again though.
I just read through his write up here: http://www.ebay.com/itm/261931901538 and he doesn't mention having to switch to a Promax baseplate so that his tool/idle screws work. Are we talking about the same tool/idle screws? I would like the ability to adjust the outboards w/o dismounting.
“You’ll own nothing” — And “you’ll be happy about it.” K. Schwab
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: FM3AAR]
#1861330
07/01/15 03:45 PM
07/01/15 03:45 PM
|
Joined: Jun 2012
Posts: 1,386 Philadelphia PA
Pynzo
Drugs are bad
|
Drugs are bad
Joined: Jun 2012
Posts: 1,386
Philadelphia PA
|
This tool / screw kit works fine for the rear carb screws. You have to figure out exactly the route through the choke linkage, fuel line, vacuum lines, it fits and works both sides. Read thoroughly the instructions on the eBay page. No need to get a ProMax setup. And you can use the stock screws for the front carb-
Edit- I'll be installing the tool before starting the engine. You can feel the ball end of the tool clip into the socket head idle screws.
Last edited by Pynzo; 07/01/15 09:29 PM.
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: Pynzo]
#1861843
07/02/15 08:47 AM
07/02/15 08:47 AM
|
Joined: Oct 2003
Posts: 2,366 Banana Republic
FM3AAR
top fuel
|
top fuel
Joined: Oct 2003
Posts: 2,366
Banana Republic
|
This tool / screw kit works fine for the rear carb screws. You have to figure out exactly the route through the choke linkage, fuel line, vacuum lines, it fits and works both sides. Read thoroughly the instructions on the eBay page. No need to get a ProMax setup. And you can use the stock screws for the front carb- Thanks for the clarification.
“You’ll own nothing” — And “you’ll be happy about it.” K. Schwab
|
|
|
Re: Six pack idle mixture screw broken -fix?
[Re: Pynzo]
#1863880
07/04/15 09:24 PM
07/04/15 09:24 PM
|
Joined: Jul 2011
Posts: 960 Chicago
PurpleBeeper
super stock
|
super stock
Joined: Jul 2011
Posts: 960
Chicago
|
This tool / screw kit works fine for the rear carb screws. You have to figure out exactly the route through the choke linkage, fuel line, vacuum lines, it fits and works both sides. Read thoroughly the instructions on the eBay page. No need to get a ProMax setup. And you can use the stock screws for the front carb-
Edit- I'll be installing the tool before starting the engine. You can feel the ball end of the tool clip into the socket head idle screws. Looks like I was wrong. That is the kit I got and looking at it (no flex in the tool) I figured "No Way" is that going to access the rear carb with straight screws, so I bought a Promax rear plate which is still a tight angle to get at and I'm using the stock screws in the Promax plate. From the your pictures it looks like I wasted my money on the Promax rear plate.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
|
|
|
|
|