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  Fixed it! But now I need help adjusting the carb.

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Author Topic:   Fixed it! But now I need help adjusting the carb.
68stang351
Gearhead

Posts: 267
From: Savoy TX, USA
Registered: Mar 2002

posted 11-12-2002 07:14 PM     Click Here to See the Profile for 68stang351   Click Here to Email 68stang351     Edit/Delete Message   Reply w/Quote
Well, I got my secondaries to open up now, but when they do, the just suddenly loses power and feels like its gonna launch you through the windshield.

It ran absolutely fine before I fixed and my secondaries didn't open.

So I think it needs adjustment. But I've never adjusted before so I need your help.

Does it sound like it's not getting enough gas, so I should make it richer?

When I'm adjusting it, how do I know I've got it right? Should I just keep revving it (getting the secondaries open) and adjusting until it doesn't "cut out"? I'm afraid of running it too lean or too rich.

Or do I take a vacuum gauge and play with it until I get a high reading?

BTW, its a 1406, and has nothing hooked up to it to pull vacuum, my timing is advanced by the ign. box I have.

I need your help desperately!

I will be eternally grateful!

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Hoofbeats are louder than Heartbeats!
68 Coupe, now with a 351W and 5speed.
Now officially dubbed "THE PIT"
New addition: 63 Fairlane 500!!

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V8 Thumper
Gearhead

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 11-12-2002 08:00 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
1406 Edelbrock? There's no secondary adjustment that I'm aware of, just the counterweights on the shaft. The secondary mixture can be tuned by jet changes, the primary circuit can be tuned by jets as well, and fine tuned by metering rod/step up spring combos. You say it falls flat on its face, like cough-sputter or boggggggg?

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html

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Fastymz
Moderator

Posts: 12015
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 11-12-2002 08:59 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
It's getting to much gas,you need to lean it down,on the secondarys side.

SCOOP

------------------
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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68stang351
Gearhead

Posts: 267
From: Savoy TX, USA
Registered: Mar 2002

posted 11-13-2002 11:54 AM     Click Here to See the Profile for 68stang351   Click Here to Email 68stang351     Edit/Delete Message   Reply w/Quote
Not really "bog", it almost dies, (it does die if its sitting still) but it just throws you forward from a sudden COMPLETE loss of power, and has a weird smell after that.

But it runs fine until I punch it.

I've had someone tell me that its not getting enough, that I needed bigger fuel lines (I'm not so sure about this source though).
I've had someone I really trust say that it's probably too much fuel. He has a dynoed 425 hp 351 fed by a 650 and says that mine shouldn't be starved by a 600.

Think I'm getting too much? How should I fix it?

I've got 5/16 fuel line, an electric pump (5.5-9 psi), and the 1406 600.

Should I switch to a smaller pump?

------------------
Hoofbeats are louder than Heartbeats!
68 Coupe, now with a 351W and 5speed.
Now officially dubbed "THE PIT"
New addition: 63 Fairlane 500!!

IP: Logged

68stang351
Gearhead

Posts: 267
From: Savoy TX, USA
Registered: Mar 2002

posted 11-13-2002 12:19 PM     Click Here to See the Profile for 68stang351   Click Here to Email 68stang351     Edit/Delete Message   Reply w/Quote
I just talked to someone from the Edelbrock tech line, and told him everything about my setup, and what was happening and he told me that it wasn't getting enough fuel.
He told me to order 1455 metering rods and 1464 springs and use the silver springs.
Does this sound right?

------------------
Hoofbeats are louder than Heartbeats!
68 Coupe, now with a 351W and 5speed.
Now officially dubbed "THE PIT"
New addition: 63 Fairlane 500!!

IP: Logged

V8 Thumper
Gearhead

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 11-13-2002 08:23 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
I don't know exactally what size those metering rods (1455) are, but if tech is thinking it's a lean condition those rods would be smaller allowing more fuel to rush by them, and the springs (1464) would be stiffer, steping up those rods sooner. There's no guarantee that exact combination will cure the problem outright, but I'd say it's a good place to start

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itlbrnmoff
Gearhead

Posts: 907
From: Indianapolis,IN.USA
Registered: Nov 2002

posted 11-17-2002 11:25 AM     Click Here to See the Profile for itlbrnmoff   Click Here to Email itlbrnmoff     Edit/Delete Message   Reply w/Quote
I had the same problem with my Edelbrock #1411 750 cfm...
While trying to de-tune some to use it on my 306,I always left the secondary jets rich,afraid of an upper rpm lean condition...
There was a huge cough and sputter...
I couldn't figure it out because the Edelbrock is a mechanical secondary carb...
I almost ditched the carb...(too big anyway)
Then I started stepping down on the secondary jets...
PRESTO !!
It was too rich...
Check your floats if you still think it's starving...
quote:
Originally posted by Fastymz:
It's getting to much gas,you need to lean it down,on the secondarys side.

SCOOP


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1983 Mustang GT T-tops
306 cid T-5 3.45 gear
under construction
No traction devices
A cool Ford Racing Hat...

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Fastymz
Moderator

Posts: 12015
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 11-17-2002 04:12 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
My pops inlaw has tuned more then a few Edelbrock carbs.The ones he has worked on,that do what your talking about,have all run better form going to smaller rods and jets.

SCOOP

------------------
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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