Edelbrock carb question

[shadango]

When I got my car it had an Edelbrock 1407 on it......through the process of getting it running, etc, I ended up putting a 1406 on it after several folks here suggested it wass just too much carb (318, J heads, purple cam, headers. edelbrock intake)and it runs pretty well...finally got it to idle low enough to not chug-chug-chug after shutting it off, but not so low as to stall. One thing I aint quite got licked yet is that I get a stumble/bog when I hit the gas hard from idle.  I have stepped the accel. pump linkage to the longest stroke....to no avail.

I have a jet/rod/spring kit from the 1407......does anyone know if I can use those in the 1406 or is the kit calibrated specifically for the 1407?

I also thought maybe the accel pump in the 1406 is going bad?

If I ease a bit into the gas it takes off well, even with my 2.76 gears.  Its just that bog when I nail it that sucks eggs.  LOL

[moper]

The step up springs are the same, the rods and jets are the same but the kits are stocked depending on the carb you order it for. So you will probably  but needing to stay on the leaner side of that 1407 kit. Get a magnifier to read the numbers and use the chart to get the result you want. In most cases, the stumble as the throttle transitions is from the step up springs being too light. So I do those first, then see if removing rod makes it run stronger, then if you run out of smaller rods, change to the next larger jet and the corresponding rod off the chart.

[HP2]

Edelbrock also makes different sizes of acellerator pump squirters too. You can mix these up to increase/decrease the pump shot.

[Supercuda]

Wha you are describing is a classic case of needing more pump shot. A bigger accelerator pump squirter is needed, and the dead spot will go away.

[shadango]

Thanks guys...I just ordered a set of squirters (3 sizes) and a new accel. pump.

Did I mention that it is fine when the engine is cold?  Bogs more as it heats up.

[MEK-Dangerfield]

Thanks guys...I just ordered a set of squirters (3 sizes) and a new accel. pump.

Did I mention that it is fine when the engine is cold?  Bogs more as it heats up.

BINGO!!

   Mine has a slight bog when it's cold, but after a few minutes it's fine. The problem you describe is indeed a lack of pump shot.

[shadango]

Thanks......

Trying to decide whether to do the new acc pump first or the squirters. 

I assume the squirters are marked somehow as far as size.  Can I change those without pulling the carb?

For the acc. pump, from what I recall, I just need to pull the top airhorn off the carb....so the carb doesnt have to be taken off the car....right?

[Supercuda]

Yes, the squirters can be accessed without dismantling or removing the carb. And yes, the accel. pump only requires removal of the airhorn. If the flt spot happens cold, there's not enough cold fuel enrichment (more choke needed), and if it happens warm, with no symptoms cold, it needs more pump shot.

[shadango]

Well, I found that to change the squirters on the Edelbrock, the air horn has to come off.

No big deal...swapped out the accel. pump while I was there.

Now, I installed the largest squirter in the kit.....(.043).....and the pump arm is on the top hole.

I seem to have more power when pulling out hard if I ease into it just a bit......but if I hit it from a dead stop hard, I still have that bog/hesitation..

Wondering if now i should move to changing the rod springs out.....Right now I have the silver ones....the shortest ones I believe.....

I just cant believe I have basically the largest setup possible for the accel pump and it still does it.....

 

[Chryco Psycho]

try moving the pump arm out to one of the other holes first , it is an easy mod & may help

[shadango]

Already tried that...went from middle hole to top hole (longest stroke)......

I had the kid rev the engine for me while I watched the exhaust......Just a hint of black smoke towards the top of the rev......no big plume of black when you first hit it.....I was wondering if maybe I am running rich at idle to the point of beginning to flood maybe but that seems to not be the case....

[HP2]

Do you have edelbrocks tuning guide? If not, down load it from their site and check what your doing against their proceedure.

[shadango]

well, I am finally getting back to this.

I installed the largest squirter and I stiill have the bog/stmble when bumping hard off idle.

If I ease it, no issues.

right now I have the shortest lightest springs installed to compensate for the low idle vaccuum I have (cam)....about 5 in hg

I haver edelbrocks spring chart but cant for the life of me tell what color I have now...just wanted to go ine step up....

[Chryco Psycho]

you could try drilling out the smaller squirter to a larger size then the 43

[shadango]

It didnt really seem like going bigger on the squirter actually did anything as far as the stumble/bog....but I do seem to have more power on a hard acceleration now.....if that makes sense.

It seems like going to the heavier (orange) spring helped some.....goona drive it a bit and see ......