Edelbrock bog problems on a 440

[moparfanUSA]

I have been reading online that alot of people are having a "bog" or hesitation problem with Edelbrock Carbs. I have a rebuilt (for the 3rd time, the guy that did it before really did a bad job...twice) 1969 440 and it runs REALLY stong NOW, but if you mash the pedal from start or slow speed, it just dies and then will pick up, we know that the acel. pump works fine. It has a 650 Thunder series on it, we have tried a 750 preformer series also with the same problem.
Everyone says that as soon as they put a holly on it, it solves their problems.
The engine is completely stock, auto trans. Have not tried Holly yet but 3 or 4 different Ed. carbs...same problem.
Anyone else having the same issue?

 

[Meep-Meep]

What is your engine combo? Cam, compression, manifold vacuum at idle?

 

[HitIt]

The edelbrock carbs are touted as 'ready to run' but they are far from it. I have one that took a good amount of fiddling to get it right. Luckily once you understand how they work they are pretty easy to diagnose.

The first thing you will need is one of their tuning kits. http://www.summitracing.com/parts/EDL-1480/

Then download the tuning kit for your carb.
http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf

My car had a terrible hesitation off idle. I went to the biggest accelerator pump nozzle, one step richer on the meetering rods, and stiffer rod springs to keep the rods in the richer step position for better response.

It did the trick and it runs strong from idle to redline. What I described above is pretty much every tuning adjustment you can make aside from the idle mixture setting and selecting the position of the accelerator pump arm. Also very important is to set the float levels as described in the tuning manual.

Also lots of people have had trouble with the "edelBOG" - especially on larger displacement engines- so there is a great deal of tuning advice online.

 

[bigmanjbmopar]

X2 what Hitit said!

 

[MoparBill]

X3.... once you get them tuned right they work just fine. I think they are easier to tune than Holleys, just my preference.
I think we are all assuming that your timing is set correctly...

 

[Meep-Meep]

My 750 Eddy AFB is mostly factory calibration except for being 4% richer in the secondaries and a slightly softer metering rod spring (orange I think). Runs great on my mild 440.

 

[Cranky]

What is your timing set at? If it's by the book, it can use more initial....at least 12-15 degrees and if the engine was rebuilt at some time using replacement pistons, the compression might be lower than original and low compression engines usually perform better with more timing dialed in.

 

[goose69]

Definatly follow the tuning suggestions HitIt sent you the links to. I had a hesitation I couldn't get worked out on my car for a while. A fella up the road from me helped out quite a bit on the tuning and being an old time racer had lots of experience. We had it running really good but still had a bit of hesitation or bog. He showed me one of his old "racing tricks". Pulled it apart and drilled a small hole (1/4" or 3/16") in each counterweight and reinstalled. I'll be dog gone if it didn't work. But please try and exhaust all your other options first.
Good luck.
By the way, I've found these carbs to be faster and easier to tune and change things on them.

 

[moparfanUSA]

carb

I have the stock cam that came with the car, for the most part...all stock.
We put a holly on it and it works fine now. Both Carbs are 650cfm, I think it should have a 750, but the stock AVS that came with the car was a 650 back then. The engine has been rebuilt with alot more compression that when I first had it done, but I do not have the specs, but alot more power.

 

[green1]

440, 9.5, mild cam, edelbrock 1407. We knew the metering rods were stock, with primary fets, lean, sec jets .102. Just got it off the dyno. Less accel shot, with timing now set at 13, and 40; gained 57 hp, with it still needing up 2 steps on primary jets, 5 on sec.

 

[green1]

We put a new eddy on it today; better, less bog, ordering a bigger squirter.

 

[99ss]

All the E-brock carbs I have used were ready to run right out of the box..... including the last one I popped onto the 440