air fuel ratio at idle with a carb.. - Chevelle Tech
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Old Apr 18th, 10, 1:49 PM
BowtieAaron BowtieAaron is offline
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Default 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
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12.27 @ 109 1.68 60ft
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Old Apr 18th, 10, 2:13 PM
novaderrik novaderrik is offline
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Default 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.
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Old Apr 18th, 10, 2:44 PM
CDN SS CDN SS is offline
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Default 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
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Old Apr 18th, 10, 4:21 PM
BowtieAaron BowtieAaron is offline
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Default 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
__________________
71 chevelle
355 10.3:1cr, brodix ik180 heads, voodoo hyd roller, holley dual plane, 650 Holley, 700r4, 3.55 gears
366rwhp 383rwtq
12.27 @ 109 1.68 60ft
Dyno video NA
http://youtu.be/PvZ7tDVyryw
Nitrous 150 shot
http://youtu.be/sg-m5knb0Ww

Last edited by BowtieAaron; Apr 18th, 10 at 4:39 PM.
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