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Library: CO% to Air Fuel Ratio (AFR) Table

This document is released under the terms of the Creative Commons License unless otherwise noted.
Thanks to Mac Townsend for writing this article.
Last modified 2007-02-10.


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One vendor for Gunson Exhaust analyzer justifies their slightly higher price by the statement that they provide a CO% to Air Fuel Ratio chart.

Wellll...here is the table, for free. Useful if you are using a Gunson???

Enjoy. Share the experience!

%CO AFR %CO AFR %CO AFR
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4		 14.72
14.54
14.42
14.34
14.28
14.23
14.21
14.17
14.15
14.11
14.09
14.04
14.01
13.98
13.94
13.89
13.86
13.82
13.80
13.77
13.73
13.69
13.63
13.59
13.56
13.54
13.49
13.45
13.41
13.38
13.34
13.31
13.27
13.24		 3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
6.0
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8		 13.20
13.15
13.12
13.08
13.03
13.00
12.96
12.93
12.90
12.86
12.83
12.80
12.75
12.70
12.66
12.64
12.59
12.54
12.51
12.46
12.43
12.40
12.37
12.30
12.25
12.25
12.22
12.18
12.13
12.10
12.09
12.03
12.00
11.96		 6.9
7.0
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
8.0
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
9.0
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
10.0

 11.93
11.89
11.86
11.82
11.79
11.76
11.72
11.69
11.65
11.61
11.58
11.54
11.50
11.46
11.43
11.40
11.36
11.32
11.28
11.25
11.21
11.16
11.12
11.08
11.05
11.01
10.97
10.94
10.90
10.86
10.82
10.79

Article written by Mac Townsend.





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