 How close is close enough..., Air Fuel Ratio-what kind of numbers do you run? |
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| computers4kids |
 Nov 17 2013, 09:31 PM
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Love these little cars!  Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None  |
I've been playing around with metering rods, springs, and jets for my Edelbrock 600 on my conversion SBC teener, using primarily a vacuum gauge and AEM wideband. I'm currently getting these type of readings
Idle-around 14.5 Cruise Mode--light throttle: 13.7 Power Mode--Heavy Acceleration: 12.3 I'm curious what kind of ratios you carb guys run? The car runs great, but I just wondering if I need to lean the power mode out. The motor likes these numbers and the plugs look good. Also curious, anyone with FI have some numbers available from their wideband? Thanks, Mark Attached image(s) 
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| sgetsiv |
Nov 21 2013, 09:17 PM
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Former 914 Owner :( Group: Members Posts: 159 Joined: 20-June 08 From: Portland, OR Member No.: 9,192 Region Association: Pacific Northwest |
I'm just getting started on carb tuning - been running way too rich for the last few years. Currently running 55 idle jets and 150 mains - EMPI HPMX Dual 44mm on my Raby 2315.
I installed an AEM wideband AFR a few months ago and am getting the following readings: At idle - 11.0 to 11.5 Cruising in the 3500-4500 rpm range - 11.5 to 12.5 WOT 2500-3000 rpm range - 10.5 to 11.0 WOT 4000-6000 rpm range - 12.0 to 12.5 Planning to try 52 and 50 idles and 145 and 140 mains over the next few weeks. |
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| 72hardtop |
May 18 2014, 12:28 PM
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Member Group: Members Posts: 120 Joined: 11-September 13 From: Seattle/HB Ca./Fujieda-Japan Member No.: 16,378 Region Association: Pacific Northwest |
QUOTE(sgetsiv @ Nov 21 2013, 08:17 PM)  I'm just getting started on carb tuning - been running way too rich for the last few years. Currently running 55 idle jets and 150 mains - EMPI HPMX Dual 44mm on my Raby 2315. I installed an AEM wideband AFR a few months ago and am getting the following readings: At idle - 11.0 to 11.5 Cruising in the 3500-4500 rpm range - 11.5 to 12.5 WOT 2500-3000 rpm range - 10.5 to 11.0 WOT 4000-6000 rpm range - 12.0 to 12.5 Planning to try 52 and 50 idles and 145 and 140 mains over the next few weeks. Your AFR at idle has everything to do with your mixture screws and nothing to do with your idle jets. Your mixture screws are out to far. LBI should be around 13.0. What distributor are you using? Only tune lean (part throttle cruise) if your using a vacuum advance distributor. If your running a centrifugal only distributor shoot for 13.2 (+-.5) across the board. Your too rich WOT. During acceleration 12's are ok but at WOT steady you should be at 13.2 (+-.5) |
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Posts in this topic
computers4kids How close is close enough... Nov 17 2013, 09:31 PM
ConeDodger You'll get better mileage with a leaner cruise... Nov 17 2013, 09:48 PM Mike Bellis My idle is 18-23
Cruise 14-17
under boost 8-10
Bu... Nov 17 2013, 09:57 PM
JRust
My idle is 18-23
Cruise 14-17
I like that ratio.... Nov 17 2013, 10:12 PM
Mike Bellis
My idle is 18-23
Cruise 14-17
I like that ratio... Nov 17 2013, 10:21 PM Andyrew
My idle is 18-23
Cruise 14-17
under boost 8-10
B... Nov 17 2013, 11:12 PM brant Water cooled motors like slightly different number... Nov 17 2013, 10:52 PM Andyrew You can lean it out a little bit for your primary ... Nov 17 2013, 11:09 PM Mark Henry For an air cooled engine you really want to be loo... Nov 17 2013, 11:26 PM AfricanHijinx I like your dash pad Nov 18 2013, 11:29 AM |
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