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  E-brock 1406 carb problems. (questions) help!

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Author Topic:   E-brock 1406 carb problems. (questions) help!
68stang351
Gearhead

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

posted 11-12-2002 12:28 PM     Click Here to See the Profile for 68stang351   Click Here to Email 68stang351     Edit/Delete Message   Reply w/Quote
OK, I was outside diddling with my carb, and what I'm seeing is that the secondary butterflies won't open up. I believe this is because of my pedal arm and my throttle cable. I can have someone put it to the floor, and look down it, and the butterflies don't open, but I can grab the linkage and pull it back further and they open.

The car was originally a six, so I'm wondering if the acc. pedal assembly is different than that of a V8 car. What I need is more pedal travel. Where the cable starts at the top of the pedal arm (in the car), if it only gets one inch of travel, then so does the linkage on the carb. I can't "just adjust it", but I need the cable to pull back about another inch.

Can anyone offer me any insight? Any ideas or suggestions?

Thanks in advance!

BTW its an Edelbrock 600. (1406)

------------------
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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Fastymz
Moderator

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

posted 11-12-2002 12:50 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I dont think the pedal travle is different from a v8 car or a 6.You cant just ajust the linkage on the carb end?

SCOOP

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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

[This message has been edited by Fastymz (edited 11-12-2002).]

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indyphil
Gearhead

Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002

posted 11-12-2002 12:52 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
I thought the secondaries opened due to air flowing across the little vanes. The 1406 I think is the same as mine (vacuum operated secondaries - electric choke - 600CFM). I may have misunderstood my carb.

I have one anyway and it seems to work fine although my car is a C code (289) not a re-engined six. My pedal to carb linkage is via a solid link (no cable). I would try attaching the cable differently to get more movement at the carb, or switch to a solid linked set up like the 68 V8 cars had.

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68stang351
Gearhead

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

posted 11-12-2002 01:05 PM     Click Here to See the Profile for 68stang351   Click Here to Email 68stang351     Edit/Delete Message   Reply w/Quote
I could adjust it on the carb end, but then it would only be idling at 3k rpm. (yes I mean 3000)

------------------
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

Fastymz
Moderator

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

posted 11-12-2002 01:07 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Are you using a heavy return spring?

SCOOP

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68stang351
Gearhead

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

posted 11-12-2002 02:05 PM     Click Here to See the Profile for 68stang351   Click Here to Email 68stang351     Edit/Delete Message   Reply w/Quote
No, but its not the spring anyway, (I don't think). The spring would not be stopping it, its the pedal hitting the floor that won't let it open more.

------------------
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

Fastymz
Moderator

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

posted 11-12-2002 02:21 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I was asking about the spring because it should be able to pull the carb linkage back.Once it is released.But in oder for you to get the carb to open all the way your saying that the cable has to pulled so far back at the carb that it wont idle below 3000.
My carter carb secondarys never opened with a load on the either.What I mean is that would not open without driving the car.When you drive the car do you fell then openning at all?

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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69 Sportsroof
Gearhead

Posts: 1214
From: Valley, Alabama, USA
Registered: Mar 2002

posted 11-12-2002 02:43 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
I dont think you will be able to see the secondaries open on a vacuum secondary carb with the car sitting still because there's no actuall load on the engine to create the necessary pull needed to open them. You should be able to "feel" them open when you are driving it.

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68stang351
Gearhead

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

posted 11-12-2002 04:18 PM     Click Here to See the Profile for 68stang351   Click Here to Email 68stang351     Edit/Delete Message   Reply w/Quote
Woohoo! I think I found the solution. I found a pedal arm from a v8 car with the mechanical linkage, and I'm installing it right now. Because of the way of its lever design, I think this will give me more travel on the upper end of it.

This setup is completely different than what was on there. I think a PO jacked with it and swapped the pedal assemblies, because the holes for this new arm are already there.

They weren't opening while being driven, because the carb was only getting about 3/4 throttle.

I will update on how good it works when I'm done, and after I get a new set of wires, one of them was burnt after arching to the headers.

------------------
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

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