%CO versus AFR

[Steve Spiers]

According to that chart posted, O2 values do not change under 13:1. Is this
correct?

Steve

Bruce wrote:

> There were some guidelines from several decades ago that showed a
> relationship.  The wrinkle is the newer gas formulaes has made them
> obsolete.    You can tune the CO/AFR by watching the HC, but that's about
> it.  Actual O2 sensing, IMO, is the most reliable way to go.
> Now in the same thought process, there is an unending conversation with the
> EPA about what a NB O2 sensor is actually sensing.
> Bruce
>
> From: Rich M
> Subject: %CO versus AFR
> Knowledgeable listers,
> Does anyone know the relationship in approximate terms for %CO in exhaust
> gas against AFR?
> eg, what is a reasonable %CO to see at 12.6:1
> A relationship, graph or table for a range would be most useful...
> I can imagine that it will vary a bit depending on conditions, but an
> approximate idea at the moment will be fine.
> Rich
>
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