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 |
Feb 10 2017, 11:41 AM
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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 |
On WOT are you documenting at bottom value? I tend to dip to 11, then rise back to 13. I can say that this is the 1st time I ever ran the car at WOT. Kinda fun but it is acellerating so fast i get skeerd.
I ran the CO screw out 1 more rotation last night. That got me from cruising at 12.5 to 12.8. That screw is about 4.5 turns out now. |
malcolm2 |
Feb 14 2017, 01:30 PM
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#3
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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 |
On WOT are you documenting at bottom value? I tend to dip to 11, then rise back to 13. I can say that this is the 1st time I ever ran the car at WOT. Kinda fun but it is acellerating so fast i get skeerd. I ran the CO screw out 1 more rotation last night. That got me from cruising at 12.5 to 12.8. That screw is about 4.5 turns out now. Saturday I took a nice long interstate drive. Not too many big hills, but some WOT...(IMG:style_emoticons/default/wink.gif) The readings were as above. About 1/2 way home I turned the CO screw one more full CCW turn (OUT). The readings at 70 mph and 3200 rpm were closer to 12.8 WOT evened out at the same 12.8 Hills also evened at 12.8 NO more adjustments and no driving 'til Monday AM but the readings changed a bit.... It was a cold morning here... 32*F My readings during the cold drive in and the warmer drive home. 3200 & 70 mph 13.2 WOT 13.2 HILLS 12.8 It rained today, but Wednesday is clear and I'll get more readings. These are really close to Mark Henry's numbers. I am feeling like I am pretty damn close. And I am curious what this might do to my MPG. |
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