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? |
timothy_nd28 |
Feb 7 2017, 08:47 PM
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#2
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
350 degrees is not normal, atleast I hope not. Remove the thermostat cable and repeat the test.
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VaccaRabite |
Apr 27 2017, 09:13 AM
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#3
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En Garde! Group: Admin Posts: 13,446 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
350 degrees is not normal, atleast I hope not. Remove the thermostat cable and repeat the test. 350 going up hill at 70 sounds pretty good to me, especially if the CHT is reading cyl 3 and you are in 5th gear. My car always used to be approaching 400 on long highway hills in 5th. It would be pulling like a champ, but getting hot. I learned to downshift to 4th at the base and keep that air moving. That said I never had valves stretching on me. Now that I'm in EFI and have a wideband I'm looking forward to see if my engine stays on the hot side or if its now going to run a bit cooler. But I'd love to see 350 at 70MPH running up some of the long ass hills here in PA. Zach |
malcolm2 |
Apr 28 2017, 06:29 AM
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#4
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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 |
I'd love to see 350 at 70MPH running up some of the long ass hills here in PA. Zach on my daily drive I have a long, low hill that I have been comparing each day. On my last trip to SC there is a mountain to climb. It seems like it is 5 miles long and very steep. My VDO CHT under #3 needle moves to what I would call 375 in 5th gear on that "hill". I filled up with 90 octane pure gas yesterday. This morning, on the "hill" maybe 75 mph the A/F was 12.2-ish and cht was dead on 350. So the A/F seems a bit rich, but still in range. Earlier in the week with 93 oct, E-10 it was reading 12.7 on my daily hill. |
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