tuning d-jet 2.0('75) - A/F ratio, effects on engine temp, Am i running lean on highway?- 14.0 @ 65-70 mph |
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tuning d-jet 2.0('75) - A/F ratio, effects on engine temp, Am i running lean on highway?- 14.0 @ 65-70 mph |
DRPHIL914 |
Jul 16 2014, 06:51 AM
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#1
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Dr. Phil Group: Members Posts: 5,768 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
So i've been able to observe my A/F ratio for the past 2 weeks, driving the car daily to work and some short trips of 30-75 miles.
yesterday evening, with the outside temp being @ 90, i noticed that as i increased my speed from @ 60mph i was running about 190 temp, A/F was @ 12.5-13.2 or so. but as i increased my speed to closer to 70, temp rose to 210 or so, maybe a bit more, and the A/F went up to @14.2 . As i slowed down, and even at idle ,the temp came down to @ 180-190 again. - so is it because of running more lean? could it be timing/advance effecting this ? or do i need to adjust the MPS? cold idle it runs at 10.5-11, warms up and driving around town im around 12.5, hard acceleration in leans out some around 13.5, etc . - its at Bob Woodmans today, getting valves set/checked and timing(lost my timing mark on the impeller) so that will all be sorted out. today and taken out of the equation. oh, and the thermostat works, fins are in the right position , no blockage etc. - running brad penn oil. - |
Mark Henry |
Jul 16 2014, 11:16 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
What you really want to be looking at is head temps. Then you will begin to learn a few things. At 400F your heads only have 1/2 their strength.
16-17 is just way too lean for an aircooled, part of the cooling comes from the fuel charge. I aim for just under 14 at cruise, 12-12.5 at WOT. |
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