Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: 74RALLYE]
#2884323
02/05/21 12:42 PM
02/05/21 12:42 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,470
Rio Linda, CA
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That mod was the fix for the same problem with the factory AVS. Most drivability techs learned it in the sixties.
The INTERNET, the MISinformation superhighway
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: 74RALLYE]
#2884357
02/05/21 02:38 PM
02/05/21 02:38 PM
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Joined: Jan 2003
Posts: 12,801 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,801
Benton, IL.
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That is a very good video for someone that insists on running one of those for what ever reason. It would have been better for all those that do not have a full set of tiny drill bits to mention what size the orifice started out at and what size it ended up at. .009" bigger is not the best way he could have communicated his changes.
With all the information and parts out there for the Holley platform carbs, I have always been surprised at the lack of CarterBrock parts and this kind of deeper tuning info given how many are out there.
But one look at the tuning charts for the metering rods and jets should still cause most guys to look for a carb elsewhere. I'll say again, the CarterBrocks are not necessarily bad carbs, it's just that there are much better choices out there today. Heck, in the Engine Masters recent cheap carb shoot-out, the CarterBrock came in last place. Even the Summit carb beat it.
Master, again and still
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: DaveRS23]
#2884366
02/05/21 03:13 PM
02/05/21 03:13 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,470
Rio Linda, CA
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Since the problem seems to exist throughout the AFB, AVS and Edelbrock series, the tube orifice size varies with the booster. We always increased the orifice two drill sizes at a time without paying any attention to the actual drill size.
The INTERNET, the MISinformation superhighway
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: John_Kunkel]
#2884388
02/05/21 04:09 PM
02/05/21 04:09 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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all they're doing is richening up the idle jet. the idle jet is the small tube in the primary cluster. i do this a bunch and is a major help on factory avs's. in short go to .035" on the 600cfm carbs and somewhere between .037"-.040" on the 750's and 800's. i never use large squirters on anything i drive; they don't work. i do use the tan colored accelerator pumps exclusively. also look for casting flash in the groove that feeds the pump reservoir. simple stuff.
i'm going to add something else. i've found dealing with the 800avs (not the avs2) that taking fuel out does help them drive better off idle. they have a .040" idle jet and don't go bigger. i've reduced main metering jet area and used small squirters to improve tip-in.
Last edited by lewtot184; 02/06/21 07:35 AM.
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: 74RALLYE]
#2884406
02/05/21 04:42 PM
02/05/21 04:42 PM
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Joined: Jan 2003
Posts: 8,451 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,451
Highland, MI.
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74Rallye - is your car out of CA? I looked at one from CA. back around 1984 - looked the same as the car in your avator. It was parked under a car port in Phoenix, AZ. An amazing all original paint car in super condition - 440 automatic. I left a note on it to ask if it was for sale, but never heard from the owner.
No Man With A Good Car Needs To Be Justified
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: John_Kunkel]
#2884485
02/05/21 07:42 PM
02/05/21 07:42 PM
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Joined: Jan 2003
Posts: 12,801 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,801
Benton, IL.
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Since the problem seems to exist throughout the AFB, AVS and Edelbrock series, the tube orifice size varies with the booster. We always increased the orifice two drill sizes at a time without paying any attention to the actual drill size. That works for you. You must have a full set of tiny drill bits to choose from. But not everybody does. A post or two later, it is noted that the drill range is " .035" on the 600cfm carbs and somewhere between .037"-.040" on the 750's and 800's." That is more very good info for those that don't want to buy a full set of drill bits to find that one or two that they will need to fix their CarterBrock's problem.
Master, again and still
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: dragon slayer]
#2884545
02/05/21 10:12 PM
02/05/21 10:12 PM
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Joined: Jan 2003
Posts: 12,801 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,801
Benton, IL.
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Obviously, you misunderstand.
I have worked on CarterBrocks before so I have plenty of drill bits. I was just thinking of the poor guy that buys one of these things and then realizes that he doesn't have enough tools to get it to run right. And there have been plenty of posts on this and many, many other boards from guys discovering just that.
CarterBrocks are not bad carbs, there are just better choices out there today. Ones that don't require a set of drill bits to get to run right.
And I am not cleaning ANYTHING out of my carbs with a drill bit.
Master, again and still
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: DaveRS23]
#2884570
02/05/21 11:40 PM
02/05/21 11:40 PM
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Joined: Dec 2013
Posts: 4,804 Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,804
Wichita
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The only reason to run an Edelbrock carb on your car is if you need to knock some power out of it to slow it down.
'63 Dodge 330
11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
9.92 @ 135mph with a 350 shot of nitrous and 93 octane pump. 1.43 60 ft. 3,750 lbs.
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: lewtot184]
#2884655
02/06/21 11:01 AM
02/06/21 11:01 AM
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Joined: Jan 2003
Posts: 12,801 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,801
Benton, IL.
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Exactly which of the above posts are more infomercial than information? The Engine Masters shoot-out where the CarterBrock came in last? The fact that the CarterBrocks have a well known off idle hesitation that other carbs don't have? The need for a set of special drill bits to fix the CarterBrock's calibration problems?
Wouldn't any open minded shopper want that information before they pulled the trigger on one of these carbs?
Master, again and still
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: DaveRS23]
#2884739
02/06/21 04:05 PM
02/06/21 04:05 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,470
Rio Linda, CA
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Since the problem seems to exist throughout the AFB, AVS and Edelbrock series, the tube orifice size varies with the booster. We always increased the orifice two drill sizes at a time without paying any attention to the actual drill size. That works for you. You must have a full set of tiny drill bits to choose from. But not everybody does. They're cheap, no excuse for not having the set. https://www.ebay.com/itm/59Pcs-Prec...l-Bits-Set-Rotary-Tools-Kit/184437419802
The INTERNET, the MISinformation superhighway
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Re: Is this the fix for Edelbrocks off idle dead spot?
[Re: John_Kunkel]
#2884784
02/06/21 05:22 PM
02/06/21 05:22 PM
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Joined: Oct 2007
Posts: 3,933 Oregon
hooziewhatsit
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master
Joined: Oct 2007
Posts: 3,933
Oregon
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I just pulled a spare 1405 (or was it a 1406? ) off the shelf. A 0.028" drill bit is the biggest that will fit in the orifice. I'm also having an off idle stumble, so I may just drill them out to 0.035"
If you ever find yourself in a fair fight, your tactics suck.
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