air fuel ratio at idle with a carb.. - Chevelle Tech
Performance Our High Performance area

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 4 (permalink) Old Apr 18th, 10, 1:49 PM Thread Starter
Senior Tech Team
Aaron
 
Join Date: Jan 2003
Location: Walnutport Pa, USA
Posts: 6,326
air fuel ratio at idle with a carb..

just got my wideband all hooked up, fired the car up after its been sitting for a few months, and was thinking..

whats the optimum A/F ratio supposed to be at idle.

i know people shoot for 14.8 at idle and cruise with an EFI motor, but what about a carb?

what bout with a big cam too?

mine was jumping around from 13.8-14.0 at idle once it was warmed. when cold it was 14.8-16.0.

it is just an AEM UEGO just to monitor, and help tune a little. no data logging capabilities.

what is optimum A/F at cruise and idle for a carb motor?

thanks

aaron

1971 Chevelle. 355, megasquirt efi. On3 7875 turbo. 4l80e, py3600, 355 gears. C5 brakes, SC&C stg2+, hellwig bars, 04-06 gto seats. 546rwhp/450rwtq with 28% converter slip on 18psi!

Little walk around video

http://youtu.be/D_B0B1RNmcc
BowtieAaron is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old Apr 18th, 10, 2:13 PM
Senior Tech Team
Derrick
 
Join Date: Feb 2002
Location: Howard Lake, MN, USA
Posts: 18,663
Re: air fuel ratio at idle with a carb..

probably as lean as you can get it without causing problems in the way it runs. each engine is going to be a little different.

"Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut"

-Hank Hill
novaderrik is online now  
post #3 of 4 (permalink) Old Apr 18th, 10, 2:44 PM
Gold Member
Bill
 
Join Date: Apr 2002
Location: Winnipeg MB. Canada
Posts: 7,383
Re: air fuel ratio at idle with a carb..

What carb ....and what cam duration @.050 and lsa ...... idle 14 cruise 15 .wot 12.5 with a HP type holley for big cam would be close

66 CDN Malibu SS A51,L34,M20 Aztec Bronze
Was 439ci Straub Solid Roller Brodix RR, SOLD
,Tremec by Liberty

10.97/ 124.31 1.41 60ft
New Foxwell Power Coming
Crusin / Track video http://www.youtube.com/watch?v=fhvDGOO4JAI

Engine
CDN SS is online now  
post #4 of 4 (permalink) Old Apr 18th, 10, 4:21 PM Thread Starter
Senior Tech Team
Aaron
 
Join Date: Jan 2003
Location: Walnutport Pa, USA
Posts: 6,326
Re: air fuel ratio at idle with a carb..

i was just thinking more in general than my actual combination.

but for sakes we will use mine as an example
355, 10:1cr
231/239 @ 050, 282/290 advertised
110/106 lsa
voodoo hyd roller (60122)

750 3310 vac sec carb

aaron

1971 Chevelle. 355, megasquirt efi. On3 7875 turbo. 4l80e, py3600, 355 gears. C5 brakes, SC&C stg2+, hellwig bars, 04-06 gto seats. 546rwhp/450rwtq with 28% converter slip on 18psi!

Little walk around video

http://youtu.be/D_B0B1RNmcc

Last edited by BowtieAaron; Apr 18th, 10 at 4:39 PM.
BowtieAaron is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle 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, you will be sent a confirmation request to this address.

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 Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



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