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Old 03-20-2016, 07:23 AM   #85
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1982 31' Airstream 310
Henniker , New Hampshire
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I read lots of opinions online when I first started tuning with my A/F gauge. I decided to shoot for readings around 13 under most conditions.

The sensor is seeing the combined reading from all 8 cylinders. If some are actually running a little lean and some rich you can't detect that.

I decided to stay toward the rich side and avoid the danger of running lean and damaging my expensive new motor.

Some of the articles I read recommended being as low as 12 for best performance.

After I get some more hours on it, I may lean it out a little more.


1982 310 motorhome 454
Henniker New Hampshire
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Old 03-20-2016, 07:31 AM   #86
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Interesting, mine gets rich on deceleration. The reading is constantly moving when driving down the road so I'm not too surprised you saw some variation, even on the test stand.


1982 310 motorhome 454
Henniker New Hampshire
Two different fuel systems at play here. Peter's is fuel injected and I think your's is carbureted. I wonder if that is the reason or if something else is at play that would cause the opposite results.
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Old 03-20-2016, 07:33 AM   #87
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1974 20' Argosy 20
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Originally Posted by chiefair View Post
I read lots of opinions online when I first started tuning with my A/F gauge. I decided to shoot for readings around 13 under most conditions.

The sensor is seeing the combined reading from all 8 cylinders. If some are actually running a little lean and some rich you can't detect that.

I decided to stay toward the rich side and avoid the danger of running lean and damaging my expensive new motor.

Some of the articles I read recommended being as low as 12 for best performance.

After I get some more hours on it, I may lean it out a little more.


1982 310 motorhome 454
Henniker New Hampshire
If I had to make a choice I'd rather be slightly rich than lean. The last thing I want to do is burn a valve.
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