Air/Fuel ratio, is there a quick answer? |
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Air/Fuel ratio, is there a quick answer? |
malcolm2 |
Feb 5 2017, 05:50 PM
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#1
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
OK, I have been tinkering with the new-to-me AFM on my 1911cc engine all weekend. I have adjusted the spring about 20 teeth CCW to get to this point.
I have been using an A/F sensor and gauge. can someone tell me, or direct me to a chart/table of what A/F I should be shooting for on my daily driver. The last adjustment of the CO screw has left me here: I have always had a strange idle situation, so lets ignore that for now. any normal adjustments to reduce the idle at normal operating temp eventually stall the car. A problem for another post. (IMG:style_emoticons/default/blink.gif) the idle is high.... at 1200 the A/F is a smooth 12.2. I found a long hill and drove up it at about 3800 rpm and the A/F was 12.5. thoughts? |
malcolm2 |
Mar 27 2017, 04:33 PM
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#2
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
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72hardtop |
Oct 29 2018, 02:19 AM
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#3
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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 |
Was it allowed to idle prior to pulling the plug/ It matters even the slightest. Also with today's ethanol blended fuel E10+ it takes a few thousand miles of seasoning the plugs before you can use them as a gauge for AFR. Load = WOT Part throttle is NOT load Cruise = part throttle condition An AFR of 16-17 at cruise (part throttle cond) is COOLER running than at an AFR of 13:0 - 13:5 With respect to jetting....Get above (14-15AFR range) when on the progression and below (14-15AFR when on the main jets. 90% of ones driving is on the progression circuit (idle jets). The following chart shows this.... |
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