Performer AFB Carb - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 05-11-2013, 03:24 PM
Chev85's Avatar
Registered User
 
Join Date: Apr 2013
Posts: 13
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
Performer AFB Carb

Hello i am doing a carb swap on my 454 with a performer intake and headers. My 600 cfm edelbrock doesn't like being pushed and starts to cut out on hills and when i step on it.
I do not know how long the afb has sat but what should I do to prepare it or to check before I put it on the motor?
Need to know ASAP
Thankyou

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-12-2013, 08:04 AM
Registered User
 
Last photo:
Join Date: May 2008
Location: ohio
Posts: 1,369
Wiki Edits: 0

Thanks: 17
Thanked 36 Times in 34 Posts
Hello need to know more info on what your motor is such as compression ratio cam specs what your timing is set at etc. I know others with more helpful info will post here but I am trying to learn from these good people. At the start off point it seems to me your really lean off idle and I am going through the same problem with a holley 600 carb. If everything else is in good shape such as your ignition system and correct timing and if your cam is not a really radical cam it could either not be getting a big enough pump shot or may need a bigger squirter. Also check float level to make sure its alright and also make sure your air bleeds are clean and clear of any gunk as that will also give it problems like this. Also check for any vacuum leaks as it will also cause off idle leaness as well as other issues. Remember start with the simple first and only do one thing at a time so as to not do too many at once and get yourself really messed up.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-12-2013, 10:14 AM
Irelands child's Avatar
Registered User
 
Last wiki edit: Ford engine specifications Last photo:
Join Date: Jan 2005
Location: Upstate New York
Posts: 4,870
Wiki Edits: 8

Thanks: 13
Thanked 185 Times in 166 Posts
Not trying to pick on the OP, but right now there are at least a half dozen very recent threads here that virtually say the same thing - "My Edelbrock wont do ---" you fill in the empty space. Assuming the rest of the engine is in good shape, ignition, timing, fuel pressure, compression and other mechanicals, you will have to read and understand the Edelbrock owner's manual for that carb, copies of which are on line if yours is lost. That 454 is a large engine and that 600cfm carb will work just fine if you are not racing the vehicle. You do have to 'tune' the carb using one of the manufacturer's kits to operate correctly as Edelbrock manufactures it to run 'out of the box' for basic 300-350 cubic inch engines at 250-300 horse power or thereabouts - and that carb on even the smaller engines will need some work to run absolutely correct.

A Carter AFB and an Edelbrock Performer carb are, with minor differences, the same.
__________________
Irelands child
Reply With Quote Quick reply to this message
The Following User Says Thank You to Irelands child For This Useful Post:
Chev85 (06-08-2013)
  #4 (permalink)  
Old 05-12-2013, 02:42 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,591
Wiki Edits: 326

Thanks: 700
Thanked 886 Times in 753 Posts
Tune the Edelbrock or the Carter with this set of plans....
http://www.edelbrock.com/automotive_...ers_manual.pdf
Different sizes of jets and metering rods are available for each make.
Reply With Quote Quick reply to this message
The Following User Says Thank You to techinspector1 For This Useful Post:
Chev85 (06-08-2013)
  #5 (permalink)  
Old 05-12-2013, 05:39 PM
RWENUTS's Avatar
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Nanaimo, BC, Canada
Age: 62
Posts: 1,877
Wiki Edits: 0

Thanks: 47
Thanked 201 Times in 190 Posts
It's not your carb's fault you have too much fuel pressure!
Put a fuel regulator on it and set it for 5.5 psi.
Reply With Quote Quick reply to this message
The Following User Says Thank You to RWENUTS For This Useful Post:
Chev85 (06-08-2013)
  #6 (permalink)  
Old 05-12-2013, 08:07 PM
spinn's Avatar
Fought beside and with you 92'
 

Last journal entry: This makes a huge difference
Last photo:
Join Date: Oct 2004
Location: midwest
Posts: 2,381
Wiki Edits: 0

Thanks: 11
Thanked 78 Times in 76 Posts
A 600 edelbrock will start it up and work to a point. It is under carbureted, a 750 would be a better choice.

I could not find where he listed fuel pump output or fuel psi. No idea why someone would assume the fuel pressure was too high.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 05-12-2013, 08:23 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,591
Wiki Edits: 326

Thanks: 700
Thanked 886 Times in 753 Posts
Quote:
Originally Posted by spinn View Post
I could not find where he listed fuel pump output or fuel psi. No idea why someone would assume the fuel pressure was too high.
Fuel pressure is almost always too high if a fellow hasn't figured pressure into his build combination.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 05-12-2013, 10:03 PM
RWENUTS's Avatar
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Nanaimo, BC, Canada
Age: 62
Posts: 1,877
Wiki Edits: 0

Thanks: 47
Thanked 201 Times in 190 Posts
[QUOTE My 600 cfm edelbrock doesn't like being pushed and starts to cut out on hills and when i step on it.
[/QUOTE]

The op described it right off the bat. Fuel pressure too high shows those symptoms.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-13-2013, 05:11 AM
Irelands child's Avatar
Registered User
 
Last wiki edit: Ford engine specifications Last photo:
Join Date: Jan 2005
Location: Upstate New York
Posts: 4,870
Wiki Edits: 8

Thanks: 13
Thanked 185 Times in 166 Posts
Quote:
Originally Posted by spinn View Post
A 600 edelbrock will start it up and work to a point. It is under carbureted, a 750 would be a better choice.

I could not find where he listed fuel pump output or fuel psi. No idea why someone would assume the fuel pressure was too high.
The owners manual, page 5, about half way down it states that 6 psig is the max (and from my experience, 5 to 5.5 is plenty)

The 600 cfm carb is just fine for a daily driver as it atomizes fuel more efficiently. A Ford 460 had a 525 4bbl Holley in 1979 on their pick ups. If it is being raced, a 750 run at WOT will most likely be better. Heck, an out of production Q-jet with tiny primaries and huge secondaries would probably be the best choice for a DD if they weren't so dam' expensive for even a rebuilt and for most, to complicated to tune

Why does it seem that everyone "assume" that every vehicle is used as a race car 100% of the time and that bigger is always better. Many folks just need and want something that runs well with a reasonable rate of gas usage with the ability to be kicked in the butt between stop lights occasionally.
__________________
Irelands child
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 05-13-2013, 12:17 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Links to manuals and rebuild/tuning info HERE.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 05-13-2013, 01:00 PM
spinn's Avatar
Fought beside and with you 92'
 

Last journal entry: This makes a huge difference
Last photo:
Join Date: Oct 2004
Location: midwest
Posts: 2,381
Wiki Edits: 0

Thanks: 11
Thanked 78 Times in 76 Posts
in 79' what did it shift at 4k rpm.

He had headers and a intake why not let it breath and recalibrate shifts to 5k rpm.

What pump is he using? How much pressure can it make?

I can turn my fuel pressure up to 8-10 psi and it will not knock the needle off the seat. You might want to experiment and see how much it takes to knock off the needle before you blame that condition on high pressure.

He is cutting out so that is too HIGH pressure? or empty fuel bowl?

ridiculous to guess.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 05-13-2013, 01:08 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,694
Wiki Edits: 0

Thanks: 3
Thanked 404 Times in 349 Posts
Quote:
Originally Posted by Chev85 View Post
Hello i am doing a carb swap on my 454 with a performer intake and headers. My 600 cfm edelbrock doesn't like being pushed and starts to cut out on hills and when i step on it.
I do not know how long the afb has sat but what should I do to prepare it or to check before I put it on the motor?
Need to know ASAP
Thankyou
This sounds like the mixture is not rich enough when power is demanded.

Could be the power enrichment system in the carb isn't working. This would be the metering pistons and rods that perform the same function of adding fuel when the manifold vacuum falls before a certain point. This function is the same as the Holley power valve on those, it just gets to power enrichment a different way. Probably a decent cleaning and rebuild would solve that problem. Given the AFB uses a seperate metering piston and rod for each side I'm not yet hard over on this as the cause as the problem seems more general.

You also cannot discount that this may be related to float height in the carb, or the fuel pump starting to crap out. Again float height is seperate left to right side so to some extent I'd be surprised to see this as a common problem.
The fuel pump not keeping up to demand would be a common problem to both sides of the carb.

Question comes to mind as to what happens when you open the secondary throttles as to whether that tends to diminsh the symptoms, worsen them, or no effect?

Then of course ther is the old axium "that most carb trouble is electrial" which is to say often these problems find their root cause in the distributor, but let's stick with the fuel system for now.

I agree with others that the 600 cfm rating is small for this engine, but it should operate acceptably.

Bogie
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 05-13-2013, 01:12 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Start w/a new fuel filter. Chances are the carb needs rebuilt if it has sat after being used- the gaskets tend to shrink after drying out.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 06-08-2013, 09:36 PM
Chev85's Avatar
Registered User
 
Join Date: Apr 2013
Posts: 13
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
Alright so I rebuilt the carb and inside nothing looked out of the ordinary...
Popped it back on and seems to work fine at the moment, but still has a backfire when you sit at a stop for more than 5-10 sec's. Upgrade to new carb?
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 06-08-2013, 10:43 PM
33Willys77's Avatar
Registered User
 
Join Date: Jan 2013
Location: Wisconsin
Posts: 402
Wiki Edits: 0

Thanks: 7
Thanked 56 Times in 54 Posts
back fire? Just from sitting or when you go to take off (which I am going to assume). Edelbrocks like as much initial advance as you can give it. Could also be pump is not squirting early enough or not enough initial shot of fuel (lean backfire through the car). Is your backfire through the carb or exhaust? Make sure your timing is set correctly for your chosen parts, then set the carb. Give specs on the engine and what is your timing set at?
Reply With Quote Quick reply to this message

Tags
carb tuning, edelbrock carb

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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 for yourself.
Email Address:

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Carter AFB 625 Carb.. ? Jeff J Engine 7 08-01-2010 07:38 AM
carter afb carb ? Area_51 Engine 11 06-14-2010 06:21 PM
AFB CARB jets and rods black rat Engine 3 07-20-2008 01:53 PM
AFB Carb Pat Lyman Engine 4 11-06-2005 01:47 AM
Carter AFB carb Question beaver24 Engine 2 11-10-2002 10:23 AM


All times are GMT -6. The time now is 09:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.