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? |
Porschef |
Feb 10 2017, 11:56 AM
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#2
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How you doin' Group: Members Posts: 2,165 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States |
Clark, are you referring to the screw on the AFM itself? Thats the only one I know of and is only an air bypass for idle. I found my car idled like crap if it was too rich, opening the screw helped.
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malcolm2 |
Feb 10 2017, 03:21 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 |
Clark, are you referring to the screw on the AFM itself? Thats the only one I know of and is only an air bypass for idle. I found my car idled like crap if it was too rich, opening the screw helped. Yeah, IIRC it is to adjust the CO. But I don't have a CO meter. SOme youtube vids on it too. Yes it is a bypass within the AFM like on the TB for idle. But this is unmeasured air that is going to increase the AF # as you open it. I believe it is the fine tune portion of the mix. I really need to open the itinerant how-to document again and read it. I am finally to a point where adjustments and tinkering with the AFM can be measured with my borrowed AFR. And they are moving the needle. |
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