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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malcolm2 |
Feb 8 2017, 11:32 AM
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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 |
350 degrees is not normal, atleast I hope not. Remove the thermostat cable and repeat the test. Well this car has run between 325 and 375 since 2013. The VDO CHT gauge has 350 at 12 o'clock. Each tick is 50 degrees. So around town I am just above 300 and pulling long hills on the interstate I get just over 350, not quite to 400. Somewhere on 914world is a nice write up by Jake. He explains a lot about CHT. From what I remember this car pretty much follows the temps in his explanation. I will see if I can find it. By the time I get to the 2nd stop sign in my neighborhood the T-stat flaps are (or should be) wide open. If I disconnect them, they will be wide open for that first cold 1/4 mile. Disconnecting would have no effect on interstate driving 10 miles from home, everything is nice and hot by then. A quick video of the car in the garage. I posted this one on my AFM thread for you Tim. Notice at 11 seconds.... CHT is 325-ish. https://www.youtube.com/watch?v=BMspGlzl6Lo |
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