74Runneer

I have a 1405 600 cfm eddy on my 318 but i dont know how to tune it. I know how to tune the idle screws with the help of youtube, but i cant figure out how to tune everything else on it. Im not sure my car needs it but id like to tune it to optimum performance. Any tips? Thanks

moe7404

check out my post in B-Body / carb / #3

74Runneer

I couldnt find it, or i dont know how to find it, can you post a link?

Archer

74

Just do a google search on "Edelbrock carburetor tuning" - there are tons of videos.

Archer

440roadrunner

You can download the "book" on those carbs right from Ed They sell tune kits with jets, springs, and metering rods.

Best thing you could do for tuning is buy yourself a wide-band O2 kit. I bought an Innovate kit with a basic display for under 140 US

The basic idea is the springs control how quickly the metering rods come up with drop in vacuum, the jets control WOT, because the rods are "full out" and of course the steps in the rods control "in between."

There are charts in the book to give you a little guide

http://www.edelbrock.com/automotive_...ers_manual.pdf

https://www.google.com/search?num=40...hp.akJQvISg7pg

moe7404

i ll try to copy and past. hang on. here. edelbrock does NOT know how to jet a carb. 1. hint change only jets. or rods at a time if you change both you cant guess what the change was. 2. hint change jets and rod to more like the size of OEM carter carbs. 3. if the jet does not come out easy dont force, that will strip the jet out. 4. hint there is a trick to get difficult jets out. take it all apart, get a small torch on the jet, when the color of the flame changes hit it with water. let it cool should work. i have done this only once, but it did work. this instruction is a short set of instructions. a full instruction set would take 2-3 pages for all the info you need for AFB carbs. ill try to make the hint no 2 more clear. :: edelbrock uses rods that have a much larger step from cruse to power steps than chrysler, rods. try useing the smallest rod step on the edelbrock .

Gorts 5th

i posted this on my edel avs hs some pics

https://moparforums.com/forums/f62/tuning-my-avs-13268/

74Runneer

So im going to buy a rebuild kit now. Im going to go smaller with the jets or rods, can someone help explain the power vs cruise chart for tuning my carb? It runs great at WOT but stumbles below that.

Heres the chart that i dont get how to read??? I guess my carb is actually 1406 electric choke***

74Runneer

This one*** oops

moe7404

as i said use a rod with the smallest difference in steps. and change ONLY a rod or jet at one time . do NOT change both at the same time. thats the basics.

74Runneer

Is this the kit that i should buy? http://www.summitracing.com/parts/ed...FetFMgodQ3gAJA

Gorts 5th

i have changed both the jets and the rods but started with the jets then rods then jets then rods now im running 104 primaries with i cant remember the exact rod size but they where the largest in the kit no. 1479
and 102 secondaries with the air valve adjusted it doesn't smoke it just pulls hard

moe7404

i know its done all the time. i dont have the room to explane here. but beleave me if you change both at the same time you can NOT guess what your change was. i have a computer program that will calculate that swap. trust me i spent MANY MANY hours working this out. if you want the program i might be able to post the URL. hang on ill try to find it. play with it to learn it. this is what my son sent me.

Here is a link to the web page: http://clarkehackworth.com/files/JetsAndRods.html

Also attached is the original email which has the file attached.

---------- Forwarded message ----------
From: "Clarke Hackworth" <clarke.hackworth@gmail.com>
Date: Jun 4, 2009 3:26 PM
Subject: Jets and Rods
To: "morris shouse" <moe7404@att.net>
Cc:

Here is Jets and Rods version 1.0
It is an html file that you can download and open in a browser. I have tried it in firefox and IE 7, it should work in other (safari, konqueror, IE 6, chrome, etc) however it is not tested so the layout may be slightly different. This is what I have created from my understanding of the information that you have provided. I hope it makes sense. If something is wrong with the labels, etc, please let me know. Also is there a way you can check the calculations? I have gone over the math and I think I have it right, but a double check would be nice.
To use, open in browser and input numbers into the text boxes. When valid input is given it will display the answer.

Gorts 5th

i thought this was interesting he modded the jets to.104 from .096 to get rid of his lean surge... interesting that i had too run the 104 s also.
on a brighter note a local gas station has real gas at 4.99 a gal.

moe7404

it was lean cause you had the wrong rod in it. the jets used on carter carbs have very precision hole. most of the time it is honed. the average drill bit will leave small marks changing the flow. not say if you increase the hole size from .050 to .100 you will lose flow, you will gain flow. but a small amount, say from .100 to .101 you may NOT gain flow, the hole smoothness is very important.