Re: off idle stumble with Edelbrock 750 - UPDATE FIXED!
[Re: 70Sbird]
#443869
09/08/09 12:04 PM
09/08/09 12:04 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
master
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master
Joined: Feb 2003
Posts: 2,810
Sobieski Wi
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1 - Edelbrock 1407 750cfm New from Summit - $259 2 - Squirters/Nozzle Kit - $23.50 3 - Calibration Kit - $46.75 4 - On the phone with Edelbrock tech guy - I get my free 43 squirter in the mail a week later , but i already told them i tried that route/bought nozzles (Read all my earlier posts) 5 - Top Hole in plunger gives you the most volume , lower holes give you a faster/quicker shot of fuel 6 - Drill this Drill that blah blah blah 7 - Countless hours working on carb and money spent 8 - Try different 4 hole spacers / Open spacers blah blah blah - Hell i spent more money on tax and or shipping charges
1 - Edelbrock 1412 800cfm New at Summit $299 PRICELESS
Sold my 1407 on Ebay - Edelbrock and many others on this forum said try the 800 series , you will love the difference
Performance out of the box - PRICELESS Plug color PERFECT - Stumble NO And i still have all the springs/nozzles/calibration kit if i still need it
Funny thing is , you think you have it fixed , and running good (And yes i also had mine about 95% fixed , and most of that time was trying to get some decent plug color , carb was so damn lean out of the box brand new , i think i went 12% richer across the board to get some color on my plugs , but still wasnt good enough after countless hours and money spent) , until you bolt something else on that actually PERFORMS AND RUNS PERFECT - The Holley 3310 that i had/tried/laying around ran flawless also - I wanted to reach that performance level with the 1407 - HA HA HA UNTIL I BOLTED ON THE EDELBROCK 1412 OUT OF THE BOX
You dont know what you got until its gone - Yep i miss it like my ex
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: off idle stumble with Edelbrock 750 - UPDATE FIXED!
[Re: 70Sbird]
#443871
09/16/09 04:49 PM
09/16/09 04:49 PM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Well, I finally got to spend some time on the car this weekend. I got the Edelbrock calibration kit out, and put the jets back to the stock size, drilled out the pump nozzles to .040, used metering rods to go one step rich, and bumped my timing 5 degrees, The stumble is 95% gone! I think with some more experimentation with the springs and maybe go to the .043 nozzles it will be completely gone. I am now very happy with the way the car runs, and thanks again to all who posted.
did you keep or remove the little weight on top of the check ball that's under the nozzles? I'm fine tuning my 600 on my 318, and removing the weight took away about 80% of the stumble, so I think I'm going to open up the nozzles a bit...just wondering if I should put the weight back in.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: off idle stumble with Edelbrock 750 - UPDATE FIXED!
[Re: patrick]
#443872
09/16/09 10:15 PM
09/16/09 10:15 PM
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Joined: Jan 2008
Posts: 350 CT USA
Nick Mineau
enthusiast
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enthusiast
Joined: Jan 2008
Posts: 350
CT USA
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I HAD THE SAME PROBLEM on my mild 440 after chasing it for 1 year and trying 3 diffrent carbs including demon and holley and edelbrock which did the best i found it to be a intake manfold problem. i had oringaly blocked the heat crossovers on my ch4b and it caused the fuel to not atomise. i took the crossover block out and havent had ANY problems sense. so if its blocked fix it. old man mopar wouldn't have a heat crossover if he dident need it. is the problem worse with a cold engine if so it means it gets better with heat. so heat the intake!!!!!
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Re: off idle stumble with Edelbrock 750 - UPDATE FIXED!
[Re: Dougsmopars]
#443875
09/17/09 08:53 PM
09/17/09 08:53 PM
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Joined: Sep 2009
Posts: 69 Menomonie,wi
menomoniemopars
member
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member
Joined: Sep 2009
Posts: 69
Menomonie,wi
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ok not really a flap ,but its weighted and usually it is too heavy and flips open to fast or not fast enough causing a stumble.. By Grinding off some weight of it u can control it better, but it takes some guess work pretty much, just easier to get a 800 avs as that is adjustable
Last edited by menomoniemopars; 09/17/09 09:00 PM.
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Re: off idle stumble with Edelbrock 750 - suggestions?
[Re: Dougsmopars]
#443876
09/18/09 10:12 PM
09/18/09 10:12 PM
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Joined: May 2008
Posts: 1,131 Thigh-Gap Junction
@#$%&*!
New user name, Same old jerk!
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New user name, Same old jerk!
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
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I'm glad to hear you've got it fixed. I agree on the lean condition but I'm not entirely convinced of the way of fixing it. What I do is ar a warm idle, shut the engine off, count to 5 (or 10, doesn't matter) and turn the key to crank it. If it doesn't start right up without touching the throttle, the idle isn't rich enough. You should be able to richen the idle via the screws until the idle suffers, if you can't do that you need to richen the primary jet/rod combo. Believe it or not, that affects the range of the idle mix adjustment. What happens is, if the idle is lean, all that lean mix in the intake is sucked into the cylinders immediately when you crack the throttle. The accel. pump circuit is there to richen the sudden rush of air through the carb, not fatten up the mixture already in tne intake. That said, a big squirt can help cover up the other problem. If your primary mix is lean it'll be weak after the pump shot has passed and power and mileage will suffer because you'll need more throttle to accelerate the way you want. Also, a big squirt will waste fuel if it isn't really needed once the rest of the fuel curve is dialed in. Quote:
I listened to the Edelbrock tech guy and installed the 43 squirters. Put back the stock jets and rods. Stumble is gone. Runs super. Went with yellow springs as i have just barely 10 inches of vac at idle in park. They were right, off idle stumble is a lean condition, needs more squirter. I guess thats why they have a tech line.
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Re: off idle stumble with Edelbrock 750 - UPDATE FIXED!
[Re: patrick]
#443879
09/21/09 10:34 PM
09/21/09 10:34 PM
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Joined: Aug 2005
Posts: 697 Central IL
70Sbird
OP
mopar
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OP
mopar
Joined: Aug 2005
Posts: 697
Central IL
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did you keep or remove the little weight on top of the check ball that's under the nozzles? I'm fine tuning my 600 on my 318, and removing the weight took away about 80% of the stumble, so I think I'm going to open up the nozzles a bit...just wondering if I should put the weight back in.
Patrick, I had no "weight" just a check ball and a spring holding the ball down, so when you opened the throttle the accel pump worked against the ball and spring (like a check valve) to shoot the fuel out of my drilled shooters. I had the car out again his weekend. I has never run as good as it does now
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Re: off idle stumble with Edelbrock 750 - UPDATE FIXED!
[Re: 70Sbird]
#443880
09/22/09 08:01 AM
09/22/09 08:01 AM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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my 600 has a little .1"x.1"x.25" chunk of metal (the weight) sitting on top of the check valve. I put it back in when I drilled out the nozzles to .040, and I still have a little off idle stumble w/the acc pump set to the inside hole, so I'm going to pull it back out tonight and see if that takes care of it.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: off idle stumble with Edelbrock 750 - suggestions?
[Re: JohnRR]
#1804587
04/16/15 12:08 AM
04/16/15 12:08 AM
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Joined: Mar 2006
Posts: 9,863 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,863
MI, usa
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They are fine carbs, just not for racing Don't tell that to the guys that race NSS with MAXWEDGE cars <img src="/ubbthreads/images/graemlins/laugh2.gif" alt="" /> again they use TWO! and if they were allowed to run TWO DP's they'd be 4 tenths faster. <img src="/ubbthreads/images/graemlins/haha.gif" alt="" /> Plenty of the N/SS cars run 2 850 Holleys. There are 4 of us in N/SS with similar combos as far as weight, cylinder head, cam , etc. They run 9.50 or 9.75 index with the Holleys. I'm the only one that still runs Eddy 750's. I run the 9.25 index. Car has been 1.29,9.12@147.7. Carbs are box stock with the chokes removed and rejeted. Squirters are stock. Doug
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