Edelbrock 1406 600 cfm Carb a little rich, how do I adjust - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 14 (permalink) Old May 31st, 06, 08:13 AM Thread Starter
Senior Tech
 
Join Date: Apr 2005
Posts: 193
Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

I have a 600cfm Edelbrock 1406 carb on my 350. Have the HEI installed and it is running pretty good. It does seem to be a little rich however. I am not a carb guy. This carb is new. Is there a simple screw adjustment to lean the carb out a little without screwing something up? If this were an 8N Ford tractor, that is about my speed when it comes to carbs.
Buildinga55 is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old May 31st, 06, 08:34 AM
Senior Tech
 
Join Date: Feb 2000
Location: McKinney, Tx
Posts: 3,557
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

No, you need to lower your jet size, very simple process on these carbs, but you have to have the calibration kit, available at Jegs or Summit. Then, all you do is take the top off of the carb (easier to do off the car, but can be done while still attached to the intake). The jets are just screws that come out, and you replace it was a smaller one, so it gets less gas. There are 4 total, 2 on the primary side and 2 on the secondary. The calibration kit comes with instructions, very good investment, it also includes step up springs and some other doo dads (metering rods)!

Last edited by kz1000ltd; May 31st, 06 at 09:03 AM.
kz1000ltd is offline  
post #3 of 14 (permalink) Old May 31st, 06, 08:37 AM
Super Moderator
Jake-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 29,421
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

There are two mixture screws on the front pointing up. These screws along with a vacuum gauge, can be used to adjust the mixture for the best running, meaning the higher the vacuum reading, the better.

I have one on Buford (black 88 Monte Carlo SS) atop a 307 w/HEI, and it pulls 17 in./Hg at 750 rpm. I have about 10* BTDC of initial.

Other than that, that's about it. Unless you want to buy a tune-up kit for it and change jets and metering rods, very easy to do. And the nice part about it you can go back to where you started.

Give a man a rescued dog for the health of both their souls.
'With age comes wisdom, but then wisdom ages you even more.'Other Stuff' CUBS - 2016 World Series Champions
Everett#2390 is offline  
post #4 of 14 (permalink) Old May 31st, 06, 08:52 AM
Senior Tech
Jim
 
Join Date: Jul 2005
Location: MA
Posts: 1,915
Send a message via Yahoo to go2fast
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

Quote:
Originally Posted by Everett#2390
There are two mixture screws on the front pointing up. These screws along with a vacuum gauge, can be used to adjust the mixture for the best running, meaning the higher the vacuum reading, the better.

I have one on Buford (black 88 Monte Carlo SS) atop a 307 w/HEI, and it pulls 17 in./Hg at 750 rpm. I have about 10* BTDC of initial.

Other than that, that's about it. Unless you want to buy a tune-up kit for it and change jets and metering rods, very easy to do. And the nice part about it you can go back to where you started.
Note that the screws adjust idle mixture only. Is it rich at idle or rich when off idle? Does the motor have a performance cam?
go2fast is offline  
post #5 of 14 (permalink) Old May 31st, 06, 01:16 PM
Senior Tech
 
Join Date: Jul 2003
Location: Delaware, OH
Posts: 335
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

I have this carb. Check the back of the manual. It has tuning graphs in the back of the book. Or go here:
http://www.edelbrock.com/automotive_...ers_manual.pdf
and slide your side bar down to the middle (Pg 13. of 26). Check the graph for the 1406 and look in the middle of the graph. That is #1, which the calibration that it comes out of the box. If you look below the graph, you'll see that #1 has a .098 main jet and a .075 x .047 metering rod. This rod and jet together create a certain air/fuel mixture. Chnaging these (by changing numbers on the chart will get you leaner. Try number 7 and then go 1 step leaner in your secondarys too. (which would be a .092 jet) that should get you close. When you check out this graph and study it for a little bit, you'll see that this is a stupid easy carb. just a note... #1 setting was way too rich fpr me with 195cc fairly high flowing heads and an RPM manifold... dont know why...
STM69 is offline  
post #6 of 14 (permalink) Old May 31st, 06, 01:26 PM
Senior Tech
Jack
 
Join Date: Jul 2002
Location: saltillo ms usa
Posts: 207
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

You don't have to remove the carb. from the intake manifold or remove the carb. top. Remove the metering rods and replace with the next larger size found in the calibration kit. On a 350 motor, you should be able to tune it for street use without changing the jets. Jack

68 camaro SS 350 convertible, 69 camaro coupe

Last edited by smalblock; May 31st, 06 at 01:39 PM.
smalblock is offline  
post #7 of 14 (permalink) Old May 31st, 06, 01:40 PM Thread Starter
Senior Tech
 
Join Date: Apr 2005
Posts: 193
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

The car is a 4 speed. Seems like it is rich at idle and when you rev up to take off in first. Also, after you turn the car off and let it sit a little while, it seems to be flooded when you first start the car. Seems to run pretty good once you get going. I may still be rich. I have not driven the car much yet as I have not had the car in the front end shop for an alignment. Just trying to get it running pretty good so I can drive it to town.
Buildinga55 is offline  
post #8 of 14 (permalink) Old May 31st, 06, 02:10 PM
Senior Tech
 
Join Date: Jul 2003
Location: Delaware, OH
Posts: 335
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

Check the plugs at idle, check them after cruising at mid RPMs by shutting it down at 3000RPM to not let the car go back to idle before you turn off the ignition. And, try WOT. You don't need to take the carb off, but just changing the metering rod over and over won't show you where you are on the graph which is really handy. Its worth the 5min. to remove the top,in my opinion. Also, on the accelerator pump (front of carb on drivers side) there is a 3 hole bracket that attaches to the throttle linkage... which hole is the linkage using? The closer to the top, the more fuel is supplied at take off.
STM69 is offline  
post #9 of 14 (permalink) Old May 31st, 06, 04:32 PM
Gold Lifetime Member
Jim
 
Join Date: Dec 1999
Location: Yorkville, Illinois USA
Posts: 22,123
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

If this is a new carb, you'd best check the float levels before you make any other changes.
And yes, the top has to come off to do that. It's easy to do.

JimM's firstgens.com Camaro Board

Jimragtop.com New website for my vert is coming together. Do ya like the slide show on the home page?
JimM is offline  
post #10 of 14 (permalink) Old May 31st, 06, 05:45 PM
Senior Tech
Jim
 
Join Date: Jul 2005
Location: MA
Posts: 1,915
Send a message via Yahoo to go2fast
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

Quote:
Originally Posted by Buildinga55
The car is a 4 speed. Seems like it is rich at idle and when you rev up to take off in first. Also, after you turn the car off and let it sit a little while, it seems to be flooded when you first start the car. Seems to run pretty good once you get going. I may still be rich. I have not driven the car much yet as I have not had the car in the front end shop for an alignment. Just trying to get it running pretty good so I can drive it to town.
If it's flooding when you shut it off hot, it may be percolating. You may need an insulating (thicker) gasket under it.
go2fast is offline  
post #11 of 14 (permalink) Old Jun 1st, 06, 12:09 AM
Senior Tech
Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,315
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

A word of warning before determining if It ACTUALLY is running rich.
If u have headers and/or upped the cam a bit, it may read rich at the exhuast but run lean in the engine..
Just before the inlet opens, there is a slightly more concentated 'pool' of mixture on top of it. both valves are open at the same time, and the length of that time and/or scavanging effect of headers, will pull this 'pool' right thru into the exhaust as raw mixture.
Determine a rich run, by reading spark plugs...make a good run of several miles, kill the engine pull and read the plugs.
There is many a good engine killed by running to lean, and blamed on cams, machining or anything else that has nothing to do with the owner.
In saying that..Carb manufactures tend to over jet a couple sizes up..the reason is if the carb is sloightly rich, engine dies, it cant be blamed on a lean carb and saves on expensive lawyers
Steptoe is offline  
post #12 of 14 (permalink) Old Jun 1st, 06, 12:50 PM Thread Starter
Senior Tech
 
Join Date: Apr 2005
Posts: 193
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

Thanks for everyones advise. The car does not have headers, but does have a very mild cam. I will drive the car this weekend 50 miles or so and pull the plugs before doing anything else. It sounds like that should give me a pretty accurate reading of a rich condition or not. Then I can determine if anything needs to be done. Thanks
Buildinga55 is offline  
post #13 of 14 (permalink) Old Jun 1st, 06, 01:26 PM
Senior Tech
Eric
 
Join Date: Jan 2005
Location: North Carolina
Posts: 596
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

The restart is common on the Edelbrock carb. There have been lots of posts here about it.

ERIC
67 Convertible, 350CID, TKO600RR, 3.73 Eaton Posi
ept000 is offline  
post #14 of 14 (permalink) Old Jun 1st, 06, 10:12 PM
Senior Tech
 
Join Date: Jan 2002
Location: OKC , OK
Posts: 1,010
Re: Edelbrock 1406 600 cfm Carb a little rich, how do I adjust

Quote:
Originally Posted by JimM
If this is a new carb, you'd best check the float levels before you make any other changes.
And yes, the top has to come off to do that. It's easy to do.
I'm having the same running rich problem on my E-Brock 1406. As JimM said above, I pulled the top off the carb and the floats were way out of adjustment. Per the E-Brock manual, the proper float level is 7/16" with the airhorn inverted and 1" max of float drop with the airhorn upright.

69 Camaro Coup-My Granny's car-327/210hp
Weiand Stealth Intake/Carter 625cfm 4bbl. carb.
Pertronix Ignition
Coated Headers/2.25" dual exhaust with H-pipe/Turbo Muffs
Th350 trans. W/Transgo Shiftkit
Search TV Christian Ministry: www.searchtv.org
Granny's 69 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Edelbrock carb running too rich... SBIROCZ Performance 4 Jul 27th, 03 05:40 PM
really really need edelbrock carb help cody Performance 22 Dec 26th, 01 10:17 AM
edelbrock carb cuttyboy Performance 13 Jun 2nd, 01 08:22 PM
edelbrock carb calibration timsisdope Tech 2000 4 Apr 29th, 01 03:48 PM
what edelbrock carb? MY FIRST 69 Tech 2000 9 May 29th, 00 03:21 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome